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Key to families | Table of families and genera
Index to accepted names and synonyms:
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|Family: Asteraceae (Compositae)||View Description||Dichotomous Key|
|Genus:||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Habit: Annual to shrub, from taproot, rhizome, or button-like caudex. Stem: 1--many, simple or branched. Leaf: alternate; mostly basal to evenly distributed; proximal generally +- petioled; middle generally reduced, sessile, often clasping. Inflorescence: heads radiate, disciform, or discoid, generally in cyme-like clusters; involucre cylindric to urn- or bell-shaped, main phyllaries generally 8, 13, or 21 in 1 series, subtended by few to many, generally much-reduced outer phyllaries, reflexed in fruit, green, often black-tipped, linear to narrowly lanceolate, glabrous or hairy; receptacle epaleate. Ray Flower: 0--21; ray generally yellow (white, pink-purple), occasionally much-reduced and scarcely exceeding phyllaries. Disk Flower: 3--100+; corolla tubular to bell-shaped, lobes erect to recurved, pale to deep yellow; anther tip +- triangular-ovate; style branch tips obtuse or truncate. Fruit: cylindric, generally shallow-ribbed or -angled, glabrous or stiff-hairy; pappus of minutely barbed bristles, white to tan.
Species In Genus: 1000+ species: worldwide, especially abundant in warm temperate, subtropical and tropical areas at mid to upper elevations. Etymology: (Latin: old man, from white pappus) Note: Many North American species formerly treated as Senecio now in Packera. The common names groundsel, ragwort, and butterweed apply to species of both genera. Neither Pericallis hybrida B. Nord. [Senecio hybridus Regel, illeg.] nor Senecio squalidus L.
eFlora Treatment Author: Debra K. Trock
Jepson Online Interchange
Key to SenecioPrevious taxon: Scorzonera hispanica
Next taxon: Senecio aphanactis
Citation for this treatment: Debra K. Trock 2017. Senecio, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=604, accessed on January 20, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on January 20, 2017.