Difference between revisions of "Heterosperma"
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|publication year=1795 | |publication year=1795 | ||
|special status= | |special status= | ||
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|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Coreopsidinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Coreopsidinae |
Latest revision as of 20:12, 5 November 2020
Annuals, 10–40(–70+) cm (taprooted). Stems 1 (bases relatively thick), ascending to erect, branched distally or ± throughout (striate). Leaves mostly cauline; opposite; obscurely petiolate or sessile; blades mostly pinnately lobed [undivided] (lobes 3–5, usually linear to filiform, sometimes lanceolate), ultimate margins usually entire, sometimes denticulate (often ciliate, at least proximally, apices acute), faces glabrous [hairy]. Heads radiate, borne singly or in loose, cymiform arrays. Calyculi of (1–)3–5+ erect, narrowly spatulate or linear to filiform, herbaceous bractlets (often surpassing phyllaries, margins usually hispid-ciliate). Involucres cylindric to obconic, 2–5 mm diam. (larger in fruit). Phyllaries 3–5+ in ± 2 series, distinct, erect, mostly oblong or ovate, equal, membranous. Receptacles concave to flat, paleate; paleae similar to phyllaries, oblong or oval to lanceolate or linear (± embracing cypselae, ± hyaline with brown striae, apices obtuse, apiculate). Ray florets 1–3[–8], pistillate, fertile; corollas pale yellow [orange]. Disc florets 3–10[–20+], bisexual, fertile; corollas ± yellow (at least distally), tubes shorter than funnelform throats, lobes 5, deltate. Cypselae (± dimorphic) outer obcompressed, ellipsoid or obovoid, winged (wings ± corky, often cucullate and/or pectinate), faces often corky-tuberculate, glabrous, inner ± obovoid, usually some (innermost) tapered to ± barbellate beaks; pappi 0, or persistent or tardily falling, of (1–)2–3 spreading to reflexed, retrorsely barbellate awns. x = 25.
Distribution
sw United States, Mexico, Central America, South America, introduced in West Indies.
Discussion
Species 5–10 (1 in the flora).
Selected References
None.