Senecio vulgaris

From Wikipedia, the free encyclopedia

Senecio vulgaris
Common groundsel
Common groundsel
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta
Class: Magnoliopsida
Order: Asterales
Family: Asteraceae
Tribe: Senecioneae
Genus: Senecio
Species: S. vulgaris
Binomial name
Senecio vulgaris
L.[1]
Range of Senecio vulgaris
Range of Senecio vulgaris
Synonyms

Senecio dunensis Dumort
Senecio radiatus W.D.J.Koch[2]

Senecio vulgaris, often known by the common name Common groundsel, a humble in appearance member of the Asteraceae family and Senecio genus, is a tenacious deciduous annual whose presence now encompasses the globe in a wide area of easy to somewhat difficult growing conditions.

The discussion of Common groundsel dates back to the first century and more recently, it is the subject of much contradictory and reactionary information about where it came from, how it got there, whether is it really hurting the crops, how to get rid of it, and how dangerous it is when ingested by various animals.

Contents


[edit] Description

This Senecio vulgaris is under a Sow Thistle.
This Senecio vulgaris is under a Sow Thistle.
Senecio vulgaris achenes and pericarp.
Senecio vulgaris achenes and pericarp.
Close-up of Senecio vulgaris flowers.
Close-up of Senecio vulgaris flowers.

Standing only between 4 and 16 inches (10 to 41 cm) tall, bright florets mostly hidden by the characteristic bract giving it the appearance of never opening flowers and with a life span of 5-6 weeks, the self fertilizing Senecio vulgaris lives humbly among and occasionally under the other weeds and is easy not to notice.

Leaves and stems

Leaves of Senecio vulgaris grow directly from the stem, sessile or lacking their own stem (petiole), alternating in direction along the length of the plant, two rounded lobes at the base of the stem (auriculate) and sub-clasping above. Leaves are pinnately lobed and +2.4 inches (61 mm) long and 1 inch (25 mm) wide and get smaller as up the plant. Leaves are covered sparsely with soft, smooth, fine hairs. Lobes typically sharp to rounded saw-toothed.[3][4]

The hollow[5] succulent stems branch at the tops and from the base.[3] Stems and leaves can both host the Cinerarea leaf rust.[6]

Flowers

Open clusters of 8 to 10 small cylinder shaped rayless yellow flower heads ¼ to ½ inch (6 to 13 mm) with a highly conspicuous ring of black tipped bracts at the base of the inflorescence as is characteristic of many members of the genus Senecio.[3]

Seeds

The name for the genus Senecio is probably derived from Senex (an old man), in reference to its downy head of seeds; "the flower of this herb hath white hair and when the wind bloweth it away, then it appeareth like a bald-headed man"[7] and like its family, flowers of Senecio vulgaris are succeeded by downy globed heads of seed. The seeds are achene, include a pappus[8] and become sticky when wet.[9] Laboratory tests have suggested maximum seed scattering distances of 2.1 and 3.2 yd (1.9 and 2.9 m) at wind speeds of 6.8 and 10.2 mph (10.9 and 16.4 km/h) respectively (affected by plant height)[6] suggests that it was more than wind that spread these groundsel seeds throughout the world.

The average weight of 1000 seeds is 0.21 gram (2,200,000 seeds per pound) and experienced a 100% germination success before drying and storage and an 87% germination success after drying and 3 years of cool dry storage.[10] In simple models for seed emergence prediction, soil thermal time did not predict the timing and extent of seedling emergence as well as hydrothermal time[11][12] (warm rain).

Roots

The root system, which stinks when dug up,[7] consists of a shallow taproot. This plant spreads by reseeding itself.[5]

Groundsel acts as a host for the fungus that causes black root rot in peas,[6] alfalfa, soybeans, carrots, tomatoes, red clover, peanuts, cucurbits, cotton, citrus, chickpeas, and several ornamental flowering plants; a list of flowering plants which can host their own fungus as well.

[edit] Common names

Senecio vulgaris, taken in France
Senecio vulgaris, taken in France

.

  • English: Old-man-in-the-Spring, Common Groundsel, Groundsel, Ragwort, Grimsel, Grinsel, Grundsel, Simson, Birdseed, Chickenweed, Old-man-of-the-spring, Squaw Weed, Grundy Swallow, Ground Glutton, Common Butterweed[13][14][15][7][6][16]
  • Portuguese: cardo-morto [13]
  • Norwegian: Åkersvineblom
  • Danish: Almindelig Brandbæger
  • Croatian: Badeljac, Guščernjak, Kostrič zečji, Obični dragušac, Obični kostriš, Obični staračac
  • German: Gemeines Greiskraut, Gemeines Kreuzkraut, Gewöhnliches Greiskraut
  • Estonian: Harilik ristirohi
  • Maltese: Ħaxixa tal-Kanali, Kubrita
  • French: Herbe aux coitrons, Séneçon commun, Séneçon vulgaire, Herbe aux coitrons, Séneçon vulgaire
  • Dutch: Klein kruiskruid
  • Swedish: Korsört, Vanlig korsört
  • Icelandic: Krossgras
  • Slovene: Navadni grint
  • Lithuanian: Paprastoji žilė
  • Latvian: Parastā krustaine
  • Finnish: Peltovillakko
  • Italian: Senecione comune
  • Spanish: hierba cana, senecio común, flor amarilla, cineraria o yuyito
  • Slovak: Starček obyčajný
  • Hebrew: סַבְיוֹן פָּשׁוּט סביון פשוט

Senecio vulgaris, an 1885 illustration.
Senecio vulgaris, an 1885 illustration.

[edit] Distribution

Senecio vulgaris is a frost resistant[3] deciduous annual plant which grows willingly in disturbed sites, waste places, roadsides, gardens, nurseries, orchards, vineyards, landscaped areas, agricultural lands,[14] at altitudes up to 1,600 feet (500 m)[3] and is, additionally, self-pollinating[14] producing 1,700 seeds per plant with three generations per year.[20] Seeds which are dispersed by wind and also which cling to clothing and animal fur,[6] and as contaminates of commercially exchanged seeds; the relocation of this plant throughout the planet has been difficult if not impossible to contain.

There is conflicting information about the native status of Senecio vulgaris in various locations. The United States Department of Agriculture (USDA), Natural Resources Conservation Service Plants Profile Database[21] considers it to be native to all 50 of the United States of America, Canada, Greenland, Saint Pierre and Miquelon,[1] the same USDA through the Germplasm Resources Information Network (GRIN)[22] considers it to be native only to parts of Afro-Eurasia[13]. The Integrated Taxonomic Information System Organization (ITIS), a partnership between many United States federal government departments and agencies[23] states that the species has been introduced to the 50 United States,[24] and the online journal Flora of North America calls it "probably introduced" to areas north of Mexico.[25] Individual research groups claim it is not native to areas they oversee: Florida,[26] Washington,[27] Wisconsin, [28] Saskatchewan,[29] British Columbia,[30] Missouri.[31] The United States Geological Survey reports that Common Groundsel is exotic to all 50 states and all Canadian provinces with the exception of Georgia, Kentucky, Massachusetts, and Labrador.[32]

Map of Senecio vulgaris's native distribution.
Map of Senecio vulgaris's native distribution.

Native[13]

Senecio vulgaris is considered to be native to Algeria, Libya, Morocco, Tunisia, Georgia, Republic of Adygea, Karachay-Cherkess Republic, Kabardino-Balkaria Republic, Republic of North Ossetia-Alania, Republic of Ingushetia, Chechen Republic, Republic of Dagestan, Amur Oblast, Chukotka Autonomous Okrug, Jewish Autonomous Oblast, Kamchatka Oblast, Koryak Autonomous Okrug, Khabarovsk Krai, Magadan Oblast, Primorsky Krai, Sakha (Yakutia) Republic, Sakhalin Oblast, South Korea, North Korea, Denmark, Faroe Islands, Finland, Iceland, Ireland, Norway, Sweden, United Kingdom, Austria, Belgium, Czech Republic, Slovakia, Germany, Hungary, Netherlands, Poland, Switzerland, Belarus, Estonia, Latvia, Lithuania, Moldova, Russian Central Federal District, Russian Southern Federal District, Ukraine, Albania, Bulgaria, Greece, Italy, Romania, Bosnia and Herzegovina, Croatia, the Republic of Macedonia, Montenegro, Serbia, and Slovenia, France and Portugal.


Current[25][33][1][34][13][17][35][36][37][38][39][40][41]

America
Canada: Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland and Labrador, Northwest Territories and Nunavut (not collected North of the Hudson Bay), Nova Scotia, Ontario, Prince Edward Island, Quebec, Saskatchewan, Yukon.
Mexico: Aguascalientes, Baja California Norte, Chiapas, Coahuila, Distrito Federal, Hidalgo, Jalisco, Estado de México, Nuevo León, Puebla, Tlaxcala, Veracruz
North America: United States of America, Greenland, Saint Pierre and Miquelon
South Amercia: Argentina, Bolivia, Chile, Ecuador, Peru
Africa
Northern Africa: Algeria, Egypt including Sinai, Libya, Morocco and Spanish Morocco, Tunisia
Asia
Western Asia: Iran, Israel with the Palestinian territories, Lebanon and Syria.
Caucasus: Adygea, Azerbaijan, Chechnya, Dagestan, Georgia, Ingushetia, Kabardino-Balkaria, Kalmykia, Karachay-Cherkessia, North Ossetia-Alania
Northwestern Asia: Arkhangelsk Oblast including Nenets Autonomous Okrug and Novaya Zemlya, Astrakhan Oblast, Bashkortostan, Belgorod Oblast, Bryansk Oblast, Chuvashia, Lipetsk Oblast, Kaliningrad Oblast, Kaluga Oblast, Novgorod Oblast, Republic of Karelia, Kirov Oblast, Komi Republic, Kursk Oblast, Mordovia, Murmansk Oblast, Orenburg Oblast, Penza Oblast, Perm Krai, Pskov Oblast, Rostov Oblast, Ryazan Oblast, Saint Petersburg, Samara Oblast, Saratov Oblast, Tambov Oblast, Tatarstan, Tula Oblast, Udmurtia, Volgograd Oblast, Vologda Oblast, Voronezh Oblast,
Siberia: Altai Krai, Buryatia, Chelyabinsk Oblast, Chita Oblast,Irkutsk Oblast, Kemerovo Oblast, Krasnoyarsk Krai, parts of Kurgan Oblast, Novosibirsk Oblast, Omsk Oblast, Sverdlovsk Oblast, Tomsk Oblast, Tuva, Tyumen Oblast, Ulyanovsk Oblast, Yamal-Nenets,
Soviet Far East: Amur Oblast, Chukotka Autonomous Okrug, Jewish Autonomous Oblast, Kamchatka Oblast, Koryak Autonomous Okrug, Khabarovsk Krai, Magadan Oblast, Primorsky Krai, Sakha (Yakutia) Republic, Sakhalin Oblast
China: Inner Mongolia, Heilongjiang, Jilin, Liaoning, Hebei and Beijing
Eastern Asia: South Korea, North Korea, Hokkaidō, Honshū, Shikoku, Kyūshū, Okinawa Island
Europe
Northern Europe: Channel Islands, Denmark, Estonia, Faeroe Islands, Finland, Iceland, Ireland with Northern Ireland, Norway, Sweden, United Kingdom
Middle Europe: Austria, Czech Republic, Germany, Poland, Slovakia, Slovenia,
East Europe: Belarus, Hungary, Latvia, Lithuania, Moldavia, Ukraine
Southeastern Europe: Bosnia and Herzegovina, Bulgaria, Croatia, Republic of Macedonia, Montenegro, Romania, Serbia
Southwestern Europe: Andorra, Azores, Balearic Islands, Canary Islands, Gibraltar, Portugal, Spain
West Europe: Belgium, France, Liechtenstein, Luxemburg, Netherlands, Switzerland,
South Europe: Albania, Chios, Corsica, Crete, Cyprus, Dodecanese, Greece, Ikaria, Italy, Karpathos, Lesbos, Samos Island, San Marino, Sardinia, Sicily with Malta, Asiatic Turkey and Turkey-in-Europe, Vatican City
Oceania
Australasia: Jarrah Forest, Swan Coastal Plain, Warren, New Zealand
Range maps for continents

[edit] Predators

Flame Shoulder moth or Ochropleura plecta.
Flame Shoulder moth or Ochropleura plecta.
Cinnabar moth (Tyria jacobaeae) caterpillar feeding on a Senecio.
Cinnabar moth (Tyria jacobaeae) caterpillar feeding on a Senecio.

The seeds of Common groundsel is a good green food for Canaries and Finches and it is available all year round.[6]

Senecio vulgaris seed has been found in the droppings of sparrows, and seedlings have been raised from the excreta of various birds. Seed has also been found in cow manure.[6]

Some Lepidoptera species eat many of the Senecio genus;[3] additional studies via electrophysiological recordings have shown that the taste sensilla of the Cinnabar moth larvae respond (get excited) specifically to the pyrrolizidine alkaloids which all Senecio are known to contain.[42]

Moths and caterpillars[43][14]

The Senecio genus also are host to other insects[14][44][45]:

Beetles

Flies

Seed flies (Diptera: Muscoidea)
Gall flies (Diptera: Tephritidae):
  • Ensina sonchi
  • Sphenella marginata
  • Trupanea stellata
  • Trypeta zoe

And other insects that are not listed here.

The ragwort flea beetle and ragwort seed fly have been approved and released for Senecio control in California[14], Australia[44] and elsewhere.

Fungus Most Senecio, including S. squalidus are susceptible to rust and other fungus and mildews[45][3][46]:

Rust fungus Uredinales
White rust Peronosporales
Sac fungus Ascochyta, Pezizomycetes
  • Ascochyta senecionicola - (Coelomycete)
Groundsel Mildew Erysiphales
Powdery Mildew Erysiphales
Black root rot Microascales

And other fungus that are not listed here.

[edit] Reputation for being noxious and toxic

Senecio vulgaris has been listed as a noxious weed,[47] being both non-indigenous to most if not all of the Americas and having a reputation for being hepatotoxic to livestock[48] and to humans.[49][50][51]

[edit] Toxic versus medicinal

Human

As a plant which is reported to be both poisonous for human ingestion and also medicinal; much of the contradiction can be found by closely reviewing the words that are used and the dose (amount) of the poisonous substance which is ingested to prove either claim. All species of the genus Senecio contain pyrrolizidine alkaloids (e.g., senecionine) a substance that when a human has chronic exposure[52] can cause irreversible liver damage.[53][7]

Common groundsel as a medicinal herb does not seem to be recommended very often since 1931 when it was recommended as a diaphoretic, an antiscorbutic, a purgative, a diuretic and an anthelmintic which was a demotion as it was previously suggested for the expelling of gravel of the kidneys and reins by Pedanius Dioscorides in the 70s-90s, for use as poultices by John Gerard in the late 1500s and as a cure for epilepsy by Nicholas Culpeper in the 1600s.[7] More current information is contradictory about the dangers of the ingestion of Groundsel. A heavily referenced paper from 1989 suggests that the response is immediate and gives pre-ambulatory care recommendations.[49] A Canadian poisonous plants information database references a paper from 1990 in presenting this prenatal warning: "In a case of prenatal exposure, a mother ingested tea containing an estimated 0.343 milligram of senecionine, resulting in fatal veno-occlusive disease in a newborn infant."[53] Information about the pyrrolizidine alkaloids, the substance present in Senecio vulgaris is much less contradictory and all warn of accumulation of the alkaloid[54][55][56][57] because it is a secondary metabolite, like ethyl alcohol[58] and one mention that perhaps it is distilled water which is harmful to laboratory animals and to human beings since every thing that drinks it inevitably dies.[59]

Livestock

Linnaeus is cited to have claimed that "goats and swine eat this common plant freely, cows being not partial to it and horses and sheep declining to touch it, but not only are caged birds fond of it (the seeds), but its leaves and seeds afford food for many of our wild species (rabbits were given as an example)."[7] More recent studies claim that the lethal amount that cattle or horses need to consume is 7% of their body weight (example: 50 pounds (23 kg) would need to be consumed by a cow weighing 700 pounds (318 kg)). Lesser amounts cause the liver to lose function but is not apparent until the animal is stressed (by new feed or location, pregnancy, a different toxin, etc). Sheep and goats have rumen bacteria that detoxify the alkaloids and are able to consume twice their body weight of this and other species of genus Senecio.[20][60] The alkaloids responsible are not destroyed by drying or by fermentation in silage.[6]

[edit] Introduced versus invasive

Introduced species become invasive when they compete with natives or with crops. Senecio vulgaris is not known to be a strong competitor but it has been known to reduce mint production.[61] There is evidence that it is not a strong invasive and sometimes protective of critically endangered native plants.[62]

Control

The approximately 22 millimetres (0.87 in) long[63] pappus seeds of Senecio vulgaris, each plant capable of producing 25,000 or more seeds (1,700 seeds per plant are more likely) with three generations of the plant per year[20]; seeds which are widely dispersed by the wind,[64] have been identified as a contaminant of cereal and vegetable seeds[3] and a poison to some livestock; there is some inspiration to understand the growth stages and determine some control methods.

Cultivation: Cultivation with the hand or tiller is a recommended method of controlling Senecio vulgaris from growing in gardens and planting fields; cultivate to a depth of 2 inches (51 mm). The plant does prefer to take root in disturbed soils, so cultivation rids new plants but also buries and stirs up new seeds so the cultivation needs to be repeated at 14-day intervals.[6] Seeds can still mature even when the plant has been killed;[48] seed from plants cut in flower had germination levels of 35%. Groundsel seed numbers increased in soil during a 2-year set-aside left fallow but not when there was a sown grass cover. The weed cannot live on grazed, trampled or mowed sites.[6]
Biological: The pathogen rust fungus or Puccinia lagenophorae and the Cinnabar moth Tyria jacobaeae have both been used and studied in an attempt to control infestation of Senecio vulgaris.[65] One study showed that rust fungus infected Senecio vulgaris survived and actually used more of the available soil nutrients.[66] The cinnabar moth eats groundsel between June and August, but the seeds germinate and the plant grows as soon as the ground is warm enough (and after a warm rain)[11], making this an insufficient control almost everywhere groundsel can be found.[20]
Chemical: Herbicides designed to control broadleaf plants are affective for controlling Senecio vulgaris in cereals and forage grasses but also will "control" broadleaf crops, such as mint, forage legumes,[61] strawberries,[67] carrots[68] and all other non-grass crops. There is also evidence that the plant develops an immunity to the chemical control.[69][70]
Other: Groundsel seedlings with 2-6 leaves are tolerant of flame weeding but the seeds are susceptible to soil solarization.[3]

[edit] Subspecies which are synonyms

  • Senecio vulgaris subsp. denticulatus (O.F. Muell.) P.D. Sell
  • Senecio vulgaris var. dubius (Ledeb.) Franch., 1883
  • Senecio vulgaris var. dubius Trautv., 1866
  • Senecio vulgaris var. hibernicus Syme
  • Senecio vulgaris var. vulgaris[71]
  • Senecio vulgaris-humilis Batt. & Trab.[72]

[edit] References

  1. ^ a b c Natural Resources Conservation Service (NRCS). PLANTS Profile, Senecio vulgaris L. (HTML). The PLANTS Database. United States Department of Agriculture,. Retrieved on 2008-01-29.
  2. ^ Royal Botanic Garden Edinburgh. Flora Europaea Search Results matching vulgaris and Senecio (HTML). Retrieved on 2008-02-01.
  3. ^ a b c d e f g h i Hedgerowmobile. Groundsel (Senecio vulgaris) (HTML). Species lists. Hedgerows, Hedges and Verges of Britain and Ireland. Retrieved on 2008-02-05.
  4. ^ Dan Tenaglia (2007-02-08). Senecio vulgaris L. (HTML). Missouri Botanical Garden Press. Retrieved on 2008-02-05.
  5. ^ a b John Hilty. Common Groundsel (Senecio vulgaris) (HTML). Illinois Wildflowers. Retrieved on 2008-02-07.
  6. ^ a b c d e f g h i j Henry Doubleday Research Association (October 2007). Groundsel (HTML). Organic Weed Management. Garden Organic. Retrieved on 2008-02-05.
  7. ^ a b c d e f M. Grieve (1931). Groundsel, Common (HTML). A Modern Herbal. © Copyright Protected 1995-2008 Botanical.com. Retrieved on 2008-02-02.
  8. ^ OMAFRA Staff (2002-06-01). Ontario Weeds: Common groundsel (HTML). Publication 505, Ontario Weeds. Government of Ontario, Canada. Retrieved on 2008-02-07.
  9. ^ O.W. Archibold, L. Wagner (2005-01-03). Volunteer vascular plant establishment on roofs at the University of Saskatchewan (HTML). Landscape and Urban Planning Pages 20-28. Elsevier. DOI:10.1016/j.landurbplan.2006.03.001. Retrieved on 2008-02-05. “The seeds of two species, thyme leaved spurge (Euphorbia glyptosperma) and groundsel (Senecio vulgaris), become sticky when wet and two others, ...”
  10. ^ Royal Botanic Gardens, Kew. Search Results Senecio vulgaris (HTML). Seed Information Database. Board of Trustees of the Royal Botanic Gardens, Kew. Retrieved on 2008-02-01.
  11. ^ a b Milt McGiffen, Kurt Spokas, Frank Forcella, David Archer, Steven Poppe, and Rodrigo Figueroa (March 2007). Emergence Prediction of Common Groundsel (Senecio Vulgaris) (HTML) Volume 56, Issue 1 (January 2008) pp. 58–65. BioOne[1]. DOI:10.1614/WS-07-060.1. Retrieved on 2008-02-01.
  12. ^ Rodrigo Figueroa, Douglas Doohan, John Cardina, and Kent Harrison (July 2006). Common Groundsel (Senecio vulgaris) Seed Longevity and Seedling Emergence (HTML) Volume 55, Issue 3 (May 2007) pp. 187–192. BioOne[2]. DOI:10.1614/WS-06-122R1.1. Retrieved on 2008-02-01.
  13. ^ a b c d e Germplasm Resources Information Network (GRIN) (2007-05-04). Taxon: Senecio vulgaris L. (HTML). Taxonomy for Plants. USDA, ARS, National Genetic Resources Program, National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved on 2008-01-27.
  14. ^ a b c d e f California Department of Food and Agriculture. Senecio genus (HTML). Encycloweedia. State of California. Retrieved on 2008-01-31.
  15. ^ Dr. Alice B. Russell, Department of Horticultural Science, North Carolina State University (1997). Poisonous Plants: Senecio spp. (HTML). Poisonous Plants of North Carolina. Retrieved on 2008-02-02.
  16. ^ Peterson Field Guide, Theodore F. Niehaus [1976]. Pacific States Wildflowers, Illustrations by Charles L. Ripper, The Peterson Field Guide Series, New York, New York 100003: Houghton Mifflin Company, page 208. ISBN 0-395-91095-1. 
  17. ^ a b Botanic Garden and Botanical Museum Berlin-Dahlem. Details for: Senecio vulgaris (HTML). Euro+Med PlantBase. Freie Universität Berlin. Retrieved on 2008-01-27.
  18. ^ Flora of North America. Chinese Plant Names Senecio vulgaris L. (HTML). Chinese Plant Names. Retrieved on 2008-02-01.
  19. ^ ノボロギク (HTML) (Japanese). Retrieved on 2008-02-03.
  20. ^ a b c d Susan Aldrich-Markham, Oregon State University (July 1994). Common Groundsel Senecio vulgaris L., PNW 466 (HTML). Pests in Gardens and Landscapes. Oregon State University Cooperative extension service. Retrieved on 2008-02-02.
  21. ^ Natural Resources Conservation Service (NRCS). The PLANTS Database (HTML). United States Department of Agriculture,. Retrieved on 2008-02-01.
  22. ^ Germplasm Resources Information Network (GRIN) (2007-10-29). National Plant Germplasm System (HTML). Germplasm Resources Information Network. USDA, ARS, National Genetic Resources Program, National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved on 2008-02-01.
  23. ^ Integrated Taxonomic Information System Organization (ITIS) (2002-09-09). About ITIS (HTML). Integrated Taxonomic Information System on-line database. Retrieved on 2008-02-01.
  24. ^ Integrated Taxonomic Information System Organization (ITIS) (2007-12-20). Senecio vulgaris (HTML). Integrated Taxonomic Information System on-line database. Retrieved on 2008-01-29.
  25. ^ a b Flora of North America. 37. Senecio vulgaris Linnaeus (HTML) Vol. 20 Page 548, 562, 563. Retrieved on 2008-02-01.
  26. ^ Dr. Richard Wunderlin or Dr. Bruce Hansen (2006). Senecio vulgaris L. (HTML). Atlas of Florida Vascular Plants. Institute for Systematic Botany. Retrieved on 2008-02-01.
  27. ^ Don Knoke (2006). Asteraceae - Senecio: Senecio vulgaris (HTML). Vascular Plants. Burke Museum of Natural History and Culture. Retrieved on 2008-02-01.
  28. ^ University of Wisconsin - Stevens Point. Senecio vulgaris L. (HTML). Robert W. Freckmann Herbarium. Retrieved on 2008-02-01.
  29. ^ Government of Saskatchewan (2007). Common Groundsel (HTML). Weed Identification Guide. Retrieved on 2008-02-01.
  30. ^ Center for Biological Informatics of the U.S. Geological Survey. Weeds of British Columbia Listed by Common Name (HTML). Retrieved on 2008-02-01.
  31. ^ Flora of North America. Flora of Missouri Senecio vulgaris Linnaeus (HTML). Retrieved on 2008-02-01.
  32. ^ United States Geological Survey (2006). Nature Serve Species Profile for Old-man-in-the-spring (Senecio vulgaris) (HTML). NatureServe. NatureServe’s Central Databases. Arlington, VA. U.S.A. Retrieved on 2008-02-01.
  33. ^ Senecio vulgaris L. (HTML) (Spanish). Primera página de la especie. Malezas de México. Retrieved on 2008-01-30.
  34. ^ Global Biodiversity Information Facility. Species: Senecio vulgaris L. Common Groundsel (HTML). Species Data. GBIF Data Portal. Retrieved on 2008-02-08.
  35. ^ Japanese Wild Flowers Senecio vulgaris (HTML). Prof. Summer's Web Garden (2007-12-31). Retrieved on 2008-02-03.
  36. ^ European crop wild relative diversity assessment and conservation forum (2005). PGR Forum Crop Wild Relative Catalogue for Europe and the Mediterranean Senecio vulgaris (HTML). CWR Case Studies. Crop Wild Relative Information System. Retrieved on 2008-02-05.
  37. ^ Helen Coleman, FloraBase: Flora of Western Australia (1997-06-18). Senecio vulgaris L. (HTML). Flora Descriptions. Government of Western Australia. Retrieved on 2008-02-03.
  38. ^ Andrew J. Lowe and Richard J. Abbott, American Journal of Botany (1998-10-30). Routes of origin of two recently evolved hybrid taxa: Senecio vulgaris var. hibernicus and York radiate groundsel (Asteraceae) (HTML). American Journal of Botany 2000;87:1159-1167. Botanical Society of America. Retrieved on 2008-02-03.
  39. ^ Instituto Darwinion. Asteraceae (PDF) ((Spanish)). Catálogo de las Plantas Vasculares de la República Argentina. II 255. Universidad de Buenos Aires. Retrieved on 2008-03-05.
  40. ^ Flora of Chile. "Volume 4 Asteraceae Senecio L." 4. 
  41. ^ Flora of Israel Online. Senecio vulgaris L. (HTML). Hebrew University of Jerusalem. Retrieved on 2008-03-06.
  42. ^ E. A. Bernays, T. Hartmann and R. F. Chapman (March 2004). Gustatory responsiveness to pyrrolizidine alkaloids in the Senecio specialist, Tyria jacobaeae (Lepidoptera, Arctiidae) (HTML). Physiological Entomology Volume 29 Issue 1 Page 67-72. Blackwell Publishing. DOI:doi:10.1111/j.1365-3032.2004.0366.x. Retrieved on 2008-02-06.
  43. ^ D. A. McLAREN, J. E. IRESON, and R. M. KWONG (4-14 July 1999). Biological Control of Ragwort (Senecio jacobaea L.) in Australia (HTML). CRC for Weed Management Systems pp. 67-79. X International Symposium on Biological Control of Weeds. Retrieved on 2008-02-20. “"Its most common host is Marsh Ragwort (S. aquaticus)”
  44. ^ a b ragwort seed fly (HTML). Invasive and Exotic Species. The Bugwood Network (November 09, 2004). Retrieved on 2008-02-20.
  45. ^ a b Senecio squalidus L. (Oxford Ragwort) (HTML). BioImages: The Virtual Field-Guide (UK). Retrieved on 2008-02-14.
  46. ^ George Edward, Massee [1915] (2007-07-10). Diseases of Cultivated Plants and Trees (HTML), The Macmillan company, 160. ISBN 1406783641. Retrieved on 2008-02-06. 
  47. ^ Natural Resources Conservation Service (NRCS). Washington State-listed Noxious Weeds (HTML). Invasive and Noxious Weeds. United States Department of Agriculture,. Retrieved on 2008-02-01.
  48. ^ a b C. A. Wilen, University of California, Integrated Pest Management Program, San Diego County (2006-05-23). Common Groundsel IMPACT (HTML). Pests in Gardens and Landscapes; Common Groundsel Management Guidelines. Statewide IPM Program, Agriculture and Natural Resources, University of California. Retrieved on 2008-02-01.
  49. ^ a b Dr A. Furtado Rahde, International Programme on Chemical Safety (September 1989). Senecio Vulgaris L. (PIM 484) (HTML). Chemical Safety Information from Intergovernmental Organizations. Retrieved on 2008-02-05.
  50. ^ Ministry of Agriculture and Lands. Common Groundsel Senecio Vulgaris (HTML). Weeds BC. Government of British Columbia. Retrieved on 2008-02-01.
  51. ^ Cornell Poisonous Plants Database (2008-01-16). Cornell University answers questions about California Bay Area plants (HTML). Retrieved on 2008-02-01.
  52. ^ GreenFacts. chronic exposure (HTML). GreenFacts Glossary. Retrieved on 2008-02-01.
  53. ^ a b Government of Canada (2006-05-30). Notes on poisoning: Senecio vulgaris (HTML). Canadian poisonous plants. Canadian Biodiversity Information Facility. Retrieved on 2008-02-02.
  54. ^ M. Walderhaug, United States Food and Drug Administration (January 1992). Bad Bug Book: Pyrrolizidine Alkaloids (HTML). Foodborne Pathogenic Microorganisms and Natural Toxins Handbook. FDA/Center for Food Safety & Applied Nutrition. Retrieved on 2008-02-05.
  55. ^ Subhuti Dharmananda, Ph.D.. SAFETY ISSUES AFFECTING HERBS: PYRROLIZIDINE ALKALOIDS (HTML). Institute for Traditional Medicine, Portland, Oregon. Retrieved on 2008-02-05.
  56. ^ Prakash AS, Pereira TN, Reilly PE, Seawright AA. (1999-07-15). Pyrrolizidine alkaloids in human diet. (HTML). National Center for Biotechnology Information, University of Queensland. Retrieved on 2008-02-05.
  57. ^ Manitoba Agriculture, Food and Rural Initiatives (MAFRI) (June 2006). Common Groundsel - Weeds - Manitoba Agriculture, Food and Rural Initiatives (HTML). Manitoba Agriculture, Food and Rural Initiatives (MAFRI) and Manitoba Agricultural Services Corporation. Retrieved on 2008-02-01.
  58. ^ Manuel Hernandez (2004-02-23). Pyrrolizidine Alkaloids (HTML). Poisonous Plants Homepage. Animal Science at Cornell University. Retrieved on 2008-02-05.
  59. ^ Carol Spears. Distilled Water, Just Say No! (HTML). Retrieved on 2008-02-05. “"All laboratory animals drink distilled water and they all die."”
  60. ^ Jennifer M. Duringer, Donald R. Buhler, A. Morrie Craig (November 2004). Comparison of hepatic in vitro metabolism of the pyrrolizidine alkaloid senecionine in sheep and cattle (HTML). American Journal of Veterinary Research Vol. 65, No. 11, Pages 1563-1572. American Veterinary Medical Association. DOI:10.2460/ajvr.2004.65.1563. Retrieved on 2008-02-05.
  61. ^ a b Common Groundsel (HTML). Written Findings of the State Noxious Weed Control Board. Washington State's 2004 Noxious Weed list (2004). Retrieved on 2008-02-03.
  62. ^ U.S. Fish and Wildlife Service (2002-06-19). Endangered and Threatened Wildlife and Plants; Critical Habitat Designation for Sidalcea keckii (Keck's checkermallow) (HTML). Federal Register Online via GPO Access RIN 1018-AG93, Page 41669-41683. United States Department of the Interior. Retrieved on 2008-02-03.
  63. ^ Department of Horticulture and Crop Science, Ohio State University. Senecio vulgaris (HTML). Seed ID Workshop. Ohio State University Cooperative extension service. Retrieved on 2008-02-01.
  64. ^ Seed Exchange (HTML). A PUBLIC ACCESS SEED BANK - ESTABLISHED 1911. J. L. Hudson, Seedsman (2008-01-31). Retrieved on 2008-02-05.
  65. ^ J. FRANTZEN and P.E. HATCHER (2004-11-24). A fresh view on the control of the annual plant Senecio vulgaris (HTML). Integrated Pest Management Reviews. Springer Netherlands. DOI:10.1023/A:1018436614685. Retrieved on 2008-02-03.
  66. ^ N. D. PAUL and P. G. AYRES (1987-11-09). Nutrient Relations of Groundsel (Senecio vulgaris) Infected by Rust (Puccinia lagenophorae) at a Range of Nutrient Concentrations II. Uptake of N, P and K and Shoot-Root Interactions (HTML) 61: 499-506, 1988. Annals of Botany Company. Retrieved on 2008-02-03.
  67. ^ Leslie Huffman- Weed Management Specialist (Horticultural Crops)/OMAFRA. Reducing Common Groundsel in Strawberry Fields (HTML). Government of Ontario, Canada. Retrieved on 2008-02-03.
  68. ^ EWRS Working Group "Weed Management Systems in Vegetables", University of Perugia. carrots.htm Weeds and weed management in carrots - a review (HTML). 11th EWRS (European Weed Research Society) Symposium 1999, Basel. Facoltà di Agraria - Università degli Studi di Perugia. Retrieved on 2008-02-03.
  69. ^ William B. McCloskey and Jodie S. Holt; University of California, Riverside, Botany and Plant Sciences Department (April 1990). Triazine Resistance in Senecio vulgaris Parental and Nearly Isonuclear Backcrossed Biotypes Is Correlated with Reduced Productivity (HTML). Plant Physiology (journal) Vol. 92(4): pp. 954–962. American Society of Plant Biologists. Retrieved on 2008-02-01. “Isonuclear triazine-susceptible and triazine-resistant Senecio vulgaris L. biotypes were developed by making reciprocal crosses between susceptible and resistant biotypes....”
  70. ^ Michel Havaux, Society for Experimental Biology, 2005 (1989). Comparison of Atrazine-Resistant and -Susceptible Biotypes of Senecio vulgaris L.: Effects of High and Low Temperatures on the in vivo Photosynthetic Electron Transfer in Intact Leaves (HTML). Journal of Experimental Botany Volume 40, Number 8, Pp. 849-854. Oxford University Press. Retrieved on 2008-02-01. “The effects of temperature on the yield of in vivo modulated chlorophyll fluorescence were measured in intact leaves of atrazineresistant and -susceptible biotypes of the weed Senecio vulgaris L. ....”
  71. ^ Missouri Botanical Garden. TROPICOS Web display Senecio vulgaris L. (HTML). Nomenclatural and Specimen Data Base. Missouri State Library. Retrieved on 2008-02-01.
  72. ^ African Flowering Plants Database. Senecio vulgaris L. (HTML). South African National Biodiversity Institute. Retrieved on 2008-02-16.

[edit] External links

Wikiversity
Wikiversity has bloom time data for Senecio vulgaris on the Bloom Clock

[edit] Further reading

Illustration of Common Groundsel.
Illustration of Common Groundsel.