Difference between revisions of "Chorisiva"
in N. L. Britton et al., N. Amer. Fl. 33: 8. 1922.
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|publication year=1922 | |publication year=1922 | ||
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|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Ambrosiinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Ambrosiinae |
Revision as of 21:38, 16 December 2019
Annuals, 5–25(–40) cm. Stems erect, diffusely branched. Leaves cauline; mostly alternate; petiolate; blades ovate or deltate to lanceolate, usually 1–2-pinnately lobed (lobes lance-ovate to linear), ultimate margins entire or toothed, faces ± scabrellous, usually gland-dotted. Heads ± discoid, mostly borne singly (in leaf axils or remote from axils, ± scattered). Involucres ± turbinate to campanulate, 2–3+ mm diam. Phyllaries persistent, 3–8+ in 1–2+ series, distinct, outer 3+ herbaceous, inner scarious to membranous, glabrous. Receptacles convex; paleae linear to setiform, membranous, usually with dilated, strigillose or ciliate tips. Pistillate florets 2–3(–5); corollas yellowish, tubular. Functionally staminate florets 5–10+; corollas yellowish, funnelform, strigillose and gland-dotted distally, lobes 5, erect (filaments ± connate, anthers weakly coherent or distinct). Cypselae obovoid, obcompressed, smooth or corky-tuberculate, glabrous (not corky-winged, not gland-dotted); pappi 0.
Distribution
sw United States.
Discussion
Species 1.
Selected References
None.