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|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: Annual to perennial herb, taprooted or with caudex or rhizome; herbage +- strigose-bristly or spreading-hairy, +- stalked-glandular, generally +- strongly aromatic. Stem: 1--many, ascending or erect, +- branched. Leaf: basal and cauline, alternate; proximal petioled or sessile, oblanceolate to ovate, petiole or blade base generally +- spreading-long-hairy; distal +- reduced. Inflorescence: +- flat-topped to raceme- or panicle-like; heads discoid or generally radiate; involucre +- cylindric to bell- or urn-shaped; phyllaries +- graduated in +- 3--7 series; receptacle flat to slightly convex, pitted, epaleate. Ray Flower: 0 or 10--40; ray yellow. Disk Flower: many; corolla yellow; anther tip narrowly triangular; style tips narrowly triangular, papillate. Fruit: obconic; ray fruit +- 3-angled, pappus 0 or of bristles; disk fruit compressed, outer pappus of few to many bristle-like scales 0.2--1 mm, inner of 30--45 bristles in 2--3 series, 3--10 mm.
Species In Genus: 28 species: North America. Etymology: (Greek: different cases, for ray and disk fruits of some species)
eFlora Treatment Author: John C. Semple
Jepson Online Interchange
Key to HeterothecaPrevious taxon: Heteranthemis viscidihirta
Next taxon: Heterotheca grandiflora
Citation for this treatment: John C. Semple 2016. Heterotheca, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=475, accessed on April 30, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on April 30, 2016.