|University of California, Berkeley|
|Jepson eFlora: Taxon page
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: Perennial herb from stout rhizome; +- dioecious. Stem: erect, unbranched, often appearing before basal leaves. Leaf: basal large, long-petioled, blades wide, entire, toothed, or +- palmately lobed; cauline generally sheathing, scale-like, proximal sometimes with blades. Inflorescence: heads generally disciform or weakly radiate, sometimes discoid, in raceme-like to +- umbel-like clusters; involucre +- cylindric to bell-shaped; main phyllaries in 1 series, equal; receptacle flat to convex, epaleate. Pistillate Flower: 0--20(70) (sterile) in staminate heads, (1)30--130+ in pistillate heads; corollas of 2 kinds, white to pale yellow, sometimes +- purple, outer often with short ray, inner cylindric. Disk Flower: generally staminate (rarely bisexual), 0--12 at center of pistillate heads, 11--78 in staminate heads; corolla white to pale yellow, sometimes +- purple; anther base entire or short-sagittate, tips acute; style tips slightly thickened, entire or slightly lobed; pappus reduced. Fruit: cylindric, 5--10-ribbed; pappus bristles 60--100+.
Species In Genus: 15--18 species: North America, Eurasia. Etymology: (Greek: broad-brimmed hat, from large leaves)
eFlora Treatment Author: David J. Keil
Jepson Online Interchange
Previous taxon: Perityle villosa
Next taxon: Petasites frigidus var. palmatus
Citation for this treatment: David J. Keil 2016. Petasites, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=550, accessed on April 28, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on April 28, 2016.