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Project Name Data (Last Modified On 6/14/2013)

Flora Data (Last Modified On 6/14/2013)
Genus Heliopsis Pers.
PlaceOfPublication Syn. P1. 2: 473. 1807.
Note TYPE: Buphthalmum helianthoides L.= Ileliopsis helianthoides (L.) Sweet.
Description Herbs; stems erect and ascending, or prostrate, leafy, branched, glabrous or variously pubescent. Leaves opposite or rarely alternate, filiform, lanceolate, orbicular, ovate, or deltoid, glabrous or variously pubescent, the margin serrate to nearly entire; nearly sessile or with petioles to 3.5 cm long. Inflorescence with heads terminal and from axils of upper leaves. Heads radiate, 0.6-3.5 cm across; involucre cupulate, the bracts 2-3-seriate, herbaceous or coriaceous, ovate- lanceolate to ovate, subequal, the outer series foliaceous and longer than the disc; receptacle broadly convex, often hollow; paleas firm, conduplicate, persisting, light brownish-yellow, red, or purple; ray florets fertile, the corollas yellow, orange-yellow, or purple, with ligules ovate-lanceolate to oblong-lanceolate, notched, persistent; disc florets perfect and fertile, the corollas yellowish, brownish-yellow or purple. Ray achenes triangular, the outer surface convex; disc achenes quadrangular apically, conical basally, glabrous or minutely pubes- cent; pappus lacking or represented by 2-3 membranaceous teeth or merely a crenulate ridge. Chromosome numbers n = 14, 16, 28.
Habit Herbs
Distribution a genus of 13 species restricted to the western hemisphere with most taxa occurring in Latin America.
Note Heliopsis helianthoides (L.) Sweet is the only species confined north of Mexico.
Reference Fisher, T. R. 1957. Taxonomy of the genus Heliopsis (Compositae). Ohio Jour. Sci. 57: 171-191.
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