Difference between revisions of "Thelesperma ambiguum"
Proc. Amer. Acad. Arts 19: 16. 1883.
Synonyms: Thelesperma fraternum Shinners Thelesperma megapotamicum var. ambiguum (A. Gray) Shinners
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|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Coreopsidinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Coreopsidinae | ||
Revision as of 18:48, 24 September 2019
Perennials or subshrubs, 10–30(–50) cm. Cauline leaves crowded to ± scattered over proximal 1/3–1/2 of plant heights, internodes mostly 5–50(–80+) mm; lobes mostly linear to filiform, sometimes oblanceolate, (5–)15–75 × 0.5–1(–2) mm. Calyculi of 3–5+ ovate to oblong bractlets 1–3 mm. Ray florets usually 8, rarely 0; laminae yellow, 4–8(–12+) mm. Disc corollas red-brown, throats shorter than lobes. Cypselae 4–5+ mm; pappi usually 1.5–2+ mm, rarely 0. 2n = 44.
Phenology: Flowering Mar–Jun.
Habitat: Disturbed sites on sands or clays
Elevation: 10–200 m
Distribution
N.Mex., Tex., Mexico (Nuevo León, Tamaulipas).
Discussion
Thelesperma ambiguum is similar to T. megapotamicum; it may be better treated as a variety of the latter.
Selected References
None.
Lower Taxa
None.