Conyza
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Authority
Acevedo-Rodríguez, Pedro & collaborators. 1996. Flora of St. John, U.S. Virgin Islands. Mem. New York Bot. Gard. 78: 1-581.
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Family
Asteraceae
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Scientific Name
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Description
Genus Description - Annual or biennial (rarely perennial) herbs, often simple-stemmed and weedy; stems and leaves more or less pubescent. Leaves simple, alternate, mostly sessile, entire to pinnatisect, pinnately veined. Inflorescence of several to many heads arranged in racemes or panicles, less commonly nearly spicate, heads rarely solitary. Heads inconspicuously heterogamous, small, disciform, subsessile or slender-pedunculate; involucre somewhat bell-shaped to hemispherical, 2- to several-seriate, soon spreading and reflexed at maturity; involucral bracts graduated, linear to lanceolate, with a herbaceous midvein and hyaline margins; receptacle mostly flat, naked, sometimes weakly foveolate-fimbriate. Outer flowers numerous and in several series, pistillate; corollas filiform, the apex denticulate or zygomorphic with a minute limb; style branches linear. Central flowers fewer, bisexual; corollas narrowly funnel-shaped or with a broadened (4-)5-lobed limb; style branches somewhat flattened, papillose. Achenes of pistillate and bisexual flowers uniform, compressed, the sides commonly 1-veined; pappus of 10-30 capillary bristles.
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Distribution
A genus of about 50 species mostly found in tropical or subtropical regions of both the New World and the Old World.
Saint John Virgin Islands of the United States South America|