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Published In: Systema Naturae, ed. 12 2: 450, 458–459. 1767[1767]. (15-31 Oct 1767) (Syst. Nat. (ed. 12)) Name publication detail
 

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
General/Distribution: A genus with about a dozen species chiefly distributed in America.

 

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Annual to perennial, hispid or prickly herbs. Leaves angular, lobed or parted. Flowers axillary or terminal, in dense heads surrounded by large, deeply cordate bracts. Epicalyx segments usually absent. Calyx 5 dentate, cupular. Petals 5. Staminal column 5-toothed, short. Carpels 5; style branches 10. Mericarps 5, usually indehiscent.
 
 
 
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