Eschscholzia californica

California Poppy

Apparently Secure  (NatureServe)
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
Order: Ranunculales
Family: Papaveraceae
Genus: Eschscholzia
Species: E. californica
Binomial name
Eschscholzia californica
Cham.

Eschscholzia californica (California poppy, Californian poppy,[1] golden poppy, California sunlight, cup of gold) is a species of flowering plant in the family Papaveraceae, native to the United States and Mexico, and the official state flower of California.

Description

It is a perennial or annual growing to 5–60 in (13–152 cm) tall, with alternately branching glaucous blue-green foliage. The leaves are alternately divided into round, lobed segments. The flowers are solitary on long stems, silky-textured, with four petals, each petal 2 to 6 cm (0.79 to 2.36 in) long and broad; flower color ranges from yellow to orange, with flowering from February to September in the northern hemisphere (spring, summer, autumn). The petals close at night or in cold, windy weather and open again the following morning, although they may remain closed in cloudy weather.[2] The fruit is a slender, dehiscent capsule 3 to 9 cm (1.2 to 3.5 in) long, which splits in two to release the numerous small black or dark brown seeds. It survives mild winters in its native range, dying completely in colder climates.

Botanical illustration
California poppy seeds

Habitat

The Antelope Valley California Poppy Reserve is located in northern Los Angeles County, California. At the peak of the blooming season, orange petals seem to cover all 1,745 acres (706 ha) of the reserve. Other prominent locations of California poppy meadows are in Bear Valley (California, Colusa County), Point Buchon and numerous other locations.

Its native habitat includes California, extending to Oregon, Washington, Nevada, Arizona, New Mexico, Sonora and northwest Baja California.[2]

Antelope Valley California Poppy Reserve
Bear Valley Poppies

Taxonomy

E. californica subsp. mexicana, Mexican gold poppy, Maricopa County, Arizona
Maritime poppies, E. californica subsp. californica var. maritima (E. L. Greene) Jeps., Cambria, California.

The species is highly variable, with over 90 synonyms. Some botanists accept two subspecies — one with four varieties (e.g., Leger and Rice, 2003) — though others do not recognize them as distinct (e.g., Jepson 1993):

History

Eschscholzia californica was the first named member of the genus Eschscholzia, named by the German botanist Adelbert von Chamisso after the Baltic German botanist Johann Friedrich von Eschscholtz, his friend and colleague on Otto von Kotzebue’s scientific expedition to California and the greater Pacific in mid-1810s aboard the Russian ship Rurik.

Cultivation

E. californica is drought-tolerant, self-seeding, and easy to grow in gardens. It is best grown as an annual, in full sun and sandy, well-drained, poor soil. Horticulturalists have produced numerous cultivars with a range of colors and blossom and stem forms. These typically do not breed true on reseeding. Seeds are often sold as mixtures. The following cultivars have gained the Royal Horticultural Society's Award of Garden Merit:-

Genetic variation in blossom colors
'Purple Gleam'
'Ivory Castle'

Other uses

California poppy leaves were used medicinally by Native Americans, and the pollen was used cosmetically. The seeds are used in cooking.[2]

An aqueous extract of the plant has sedative and anxiolytic action.[10] The extract acts as a mild sedative when smoked. The effect is far milder than that of opium. California poppy contains a different class of alkaloids:[11][12]

"An aqueous alcohol extract of Eschscholzia californica has been evaluated for benzodiazepine, neuroleptic, antidepressant, antihistaminic and analgesic properties. The plant extract did not protect mice against the convulsant effects of pentylenetetrazol, and did not cause muscle relaxant effects, but appeared to possess an affinity for the benzodiazepine receptor. The extract induced peripheral analgesic effects in mice but did not possess antidepressant, neuroleptic or antihistaminic effects."[13]

Invasive species

Because of its beauty and ease of growing, the California poppy was introduced into several regions with similar Mediterranean climates. It is commercially sold and widely naturalized in Australia, and was introduced to South Africa, Chile, and Argentina. It is recognized as a potentially invasive species within the United States, although no indications of ill effects have been reported for this plant where it has been introduced outside of California. The golden poppy has been displaced in large areas of its original habitat, such as Southern California, by more invasive exotic species, such as mustard or annual grasses.

Chilean population

In Chile, it was introduced from multiple sources between the mid-19th century and the early 20th century. It appears to have been both intentionally imported as an ornamental garden plant, and accidentally introduced along with alfalfa seed grown in California. Since Chile and California have similar climatic regions and have experienced much agricultural exchange, it is perhaps not surprising that it was introduced to Chile. Once there, its perennial forms spread primarily in human-disturbed environments (Leger and Rice, 2003).

Interestingly, the introduced Chilean populations of California poppy appear to be larger and more fecund in their introduced range than in their native range (Leger and Rice, 2003). Introduced populations have been noted to be larger and more reproductively successful than native ones (Elton, 1958), and there has been much speculation as to why. Increase in resource availability, decreased competition, and release from enemy pressure have all been proposed as explanations.

One hypothesis is that the resources devoted in the native range to a defense strategy, can in the absence of enemies be devoted to increased growth and reproduction (the EICA Hypothesis, Blossey & Nötzold, 1995). However, this is not the case with introduced populations of E. californica in Chile: the Chilean populations were actually more resistant to Californian caterpillars than the native populations (Leger and Forister, 2005).

State flower

As the official state flower of California Eschscholzia californica is pictured on welcome signs along highways entering California[14] and official Scenic Route signs.

It was selected as the state flower by the California State Floral Society in December 1890, winning out over the Mariposa lily (genus Calochortus) and the Matilija poppy (Romneya coulteri) by a wide margin, but the state legislature did not make the selection official until 1903. Its golden blooms were deemed a fitting symbol for the Golden State. April 6 is designated California Poppy Day.

See also

Notes

  1. ↑ "BSBI List 2007" (xls). Botanical Society of Britain and Ireland. Retrieved 2014-10-17.
  2. 1 2 3 "California poppy, golden poppy, copa de oro". Florida Museum of Natural History, University of Florida. Retrieved April 9, 2012.
  3. ↑ Eschscholzia mexicana at Arizona State University
  4. ↑ RHS Plant Selector Eschscholzia californica AGM / RHS Gardening
  5. ↑ RHS Plant Selector Eschscholzia californica 'Appleblossom Bush' (Thai Silk Series) AGM / RHS Gardening
  6. ↑ RHS Plant Selector Eschscholzia californica 'Dali' AGM / RHS Gardening
  7. ↑ RHS Plant Selector Eschscholzia californica 'Lemon Bush' (Thai Silk Series) AGM / RHS Gardening
  8. ↑ RHS Plant Selector Eschscholzia californica 'Rose Chiffon' (Thai Silk Series) AGM / RHS Gardening
  9. ↑ RHS Plant Selector Eschscholzia californica Thai Silk Series AGM / RHS Gardening
  10. ↑ Rolland, A.; Fleurentin, J.; Lanhers, M.C.; Younos, C.; Misslin, R.; Mortier, F.; Mortier, J.M. (June 1991). "Behavioural Effects of the American Traditional Plant Eschscholzia Californica: Sedative and Anxiolytic Properties". Planta Medica 57 (3): 212–216. doi:10.1055/s-2006-960076.
  11. ↑ Klvana, M.; Chen, J.; Lepine, F.; Legros, R.; Jolicoeur, M. (July 2006). "Analysis of Secondary Metabolites From Eschscholtzia Californica by High-performance Liquid Chromatography". Phytochemical Analysis 17 (4): 236–242. doi:10.1002/pca.913.
  12. ↑ MacLeod, B.P.; Facchini, P.J. (2006). "Methods for Regeneration and Transformation in Eschscholzia Californica: A Model Plant to Investigate Alkaloid Biosynthesis". Methods in Molecular Biology 318: 357–368. doi:10.1385/1-59259-959-1:357.
  13. ↑ Rolland, A.; Fleurentin, J.; Lanhers, M.C.; Misslin, R.; Mortier, F. (August 2001). "Neurophysiological Effects of an Extract of Eschscholzia Californica Cham. (Papaveraceae)". Phytotherapy Research 15 (5): 377–381. doi:10.1002/ptr.884.
  14. ↑ "California Government Code §421". State of California. Retrieved April 14, 2012.

References

External links

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