Senecio

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Senecio

Senecio greyii, a shrub about 0.8 meters across.

Scientific classification

Kingdom:	Plantae
Division:	Magnoliophyta
Class:	Magnoliopsida
Order:	Asterales
Family:	Asteraceae
Genus:	Senecio L.

Species

Some 1500, see text

Synonyms

Jacobaea L.

Senecio is a genus of the daisy family (Family Asteraceae) includes ragworts and groundsels. The flower heads are normally rayed, completely yellow, and the heads are borne in branched clusters. Though of late the genus has been reviewed and split up, it still contains a vast number of species (about 1,500) of extremely wide form including leaf succulents, stem and tuber succulents, annuals, perennials, aquatic forms, climbers, shrubs and small trees. Some species produce natural pesticides (especially alkaloids) to deter or even kill animals that would eat them.

Senecio species are used as food plants by the larvae of some Lepidoptera species - see list of Lepidoptera which feed on Senecio.

[edit] Species

Senecio actinella Greene -- Flagstaff ragwort
Senecio amplectens Gray -- alpine groundsel, showy alpine groundsel, showy alpine ragwort
Senecio ampullaceus Hook. -- Texas ragwort
Senecio aphanactis Greene -- chaparral ragwort
Senecio aquaticus Hill -- marsh ragwort
Senecio arizonicus Greene -- Arizona ragwort
Senecio aronicoides DC. -- rayless ragwort
Senecio astephanus Greene -- San Gabriel ragwort
Senecio atratus Greene -- tall blacktip ragwort
Senecio bicolor (Willd.) Todaro -- silver ragwort
Senecio bigelovii Gray -- nodding ragwort, Bigelow grounsel
Senecio blochmaniae Greene -- dune ragwort
Senecio brasiliensis
Senecio californicus DC. -- California ragwort
Senecio cambrensis Rosser -- Welsh groundsel, Welsh ragwort
Senecio cannabifolius Less. -- Aleutian ragwort
Senecio cannabinifolius Hook. & Arn. -- hempleaf ragwort
Senecio cineraria DC. -- Dusty miller
Senecio citriformis -- Blue Seaweed
Senecio clarkianus Gray -- Clark's ragwort
Senecio cleavelandii Greene
Senecio clivorum Maxim. -- summer ragwort
Senecio congestus (R. Br.) DC. -- clustered marsh ragwort, marsh leabane
Senecio crassissimus Humbert -- vertical leaf
Senecio crassulus Gray -- meadow groundsel, thickleaf groundsel, thickleaf ragwort
Senecio cynthiodes Greene
Senecio doria L. -- golden ragwort
Senecio eboracensis Abbott & Lowe -- York groundsel
Senecio elegans L. -- redpurple ragwort
Senecio elmeri Piper -- Elmer's ragwort
Senecio eremophilus Richards. -- desert groundsel, desert ragwort
Senecio ertterae T.M. Barkl. -- Ertter's ragwort
Senecio erucifolius L. -- hoary ragwort
Senecio flaccidus Less. -- Douglas senecio, threadleaf groundsel, threadleaf ragwort
Senecio fluviatilis Wallr. -- broad-leaved ragwort
Senecio fremontii Torr. & Gray -- dwarf mountain ragwort, Fremont's groundsel
Senecio glastiflorus L. f. -- purple ragwort
Senecio haworthii (Sweet) Sch.Bip. woolly senecio
Senecio hydrophiloides Rydb. -- tall groundsel, tall groundsel
Senecio hydrophilus Nutt. -- alkali marsh groundsel, water groundsel, water ragwort
Senecio integerrimus Nutt. -- lamb-tongue ragwort, lambstongue groundsel, lambstongue ragwort
Senecio inaequidens DC. -- narrow-leaved ragwort
Senecio jacobaea L. -- ragwort, stinking willie, tansy ragwort

Senecio keniodendron in Mackinder Valley, Mount Kenya.

Senecio mandraliscae

Senecio lemmonii Gray -- Lemmon groundsel, Lemmon's ragwort, Lemmon's butterweed
Senecio litorosus Fourc.
Senecio lucidus (Sw.) DC.
Senecio lugens Richards. -- small blacktip ragwort
Senecio lyonii Gray -- island senecio
Senecio madagascariensis Poir. -- fireweed, Madagascar groundsel, Madagascar ragwort
Senecio mandraliscae -- Blue Finger
Senecio megacephalus Nutt. -- rocky ragwort
Senecio millefolius Torrey and Gray
Senecio mohavensis Gray -- Mohave groundsel, Mojave ragwort
Senecio moresbiensis (Calder & Taylor) G.W. Douglas & G. Ruyle-Douglas -- cleftleaf ragwort

A Senecio species at Longwood Gardens

Senecio multidentatus Schultz-Bip. ex Hemsl. -- Huachuca Mountain ragwort
Senecio multilobatus -- axhead butterweed
Senecio musiniensis Welsh -- Musinea ragwort
Senecio neomexicanus -- New Mexico groundsel, New Mexico butterweed
Senecio neowebsteri Blake -- Olympic Mountain ragwort
Senecio newcombei Greene -- Newcombe's ragwort
Senecio obovatus -- Ragwort
Senecio ovatus (P. Gaertn., B. Mey. & Scherb.) Willd. -- wood ragwort
Senecio paludosus L. Great Fen Ragwort
Senecio parryi Gray -- mountain ragwort, Parry groundsel
Senecio pattersonensis Hoover -- Mono groundsel, Patterson's senecio
Senecio pseudoarnica Less. -- seaside ragwort
Senecio pterophorus DC. -- shoddy ragwort
Senecio pudicus Greene -- bashful ragwort
Senecio quaerens -- Gila groundsel
Senecio rapifolius Nutt. -- openwoods ragwort
Senecio riddellii Torr. & Gray -- Riddell groundsel, Riddell's ragwort, Sand groundsel
Senecio rowleyanus -- String of pearls
Senecio rupestris Waldst. & Kit. -- rock ragwort
Senecio sacramentanus Woot. & Standl. -- Sacramento ragwort
Senecio schweinitizianus Nuttall
Senecio scorzonella Greene -- Sierra groundsel, Sierra ragwort
Senecio serra Hook. -- butterweed, butterweed groundsel, tall ragwort
Senecio sheldonensis Porsild -- Mt. Sheldon ragwort
Senecio silignus De Candolle
Senecio soldanella Gray -- Colorado ragwort
Senecio spartioides Torr. & Gray -- broom groundsel, broom-like ragwort
Senecio sphaerocephalus Greene -- ballhead ragwort, marsh groundsel
Senecio squalidus L. -- Oxford ragwort
Senecio sylvatica Linnaeus
Senecio sylvaticus L. -- woodland ragwort
Senecio taraxacoides (Gray) Greene -- dandelion ragwort
Senecio triangularis Hook. -- arrowleaf groundsel, arrowleaf ragwort
Senecio viscosus L. -- sticky ragwort
Senecio vulgaris L. -- common groundsel, old-man-in-the-spring
Senecio warnockii Shinners -- Warnock's ragwort
Senecio wootonii Greene -- Wooton ragwort, Wooton's ragwort, Wooton's butterweed