Flora of North America species comparison

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Thelesperma simplicifolium

Edwards Plateau greenthread, slender greenthread
Habit Perennials or subshrubs (may flower first year), (20–)30–70+ cm.
Cauline leaves

± scattered over proximal 3/4+ of plant heights, internodes mostly 45–95 mm;

lobes mostly linear to filiform, sometimes oblanceolate, (5–)15–45(–60) × 0.5–1(–2) mm.
Ray florets

usually 8, rarely 0;

laminae yellow, 9–15(–20+) mm.
Disc corollas

yellow with red-brown nerves, throats equal to or longer than lobes.
Calyculi

of 6–8+ linear to subulate bractlets 1–3+ mm.
Cypselae

3–4 mm;

pappi usually 0, rarely 0.1–0.3+ mm.
2n

= 20.

Thelesperma simplicifolium
Phenology Flowering Apr–Jul(–Oct).
Habitat Openings in oak/juniper woodlands or desert scrub, usually on limestone
Elevation 100–1500 m (300–4900 ft)
Distribution
from FNA
TX; Mexico (Chihuahua, Coahuila, Nuevo León, Tamaulipas)
[WildflowerSearch map]
[BONAP county map]
Discussion

Thelesperma simplicifolium is used in roadside plantings and may be encountered as a waif outside its natural range in the flora area (e.g., in California).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 201.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Thelesperma
Sibling taxa
T. ambiguum, T. burridgeanum, T. filifolium, T. flavodiscum, T. longipes, T. megapotamicum, T. nuecense, T. subnudum
Synonyms Cosmidium simplicifolium, T. curvicarpum
Name authority (A. Gray) A. Gray: Hooker’s J. Bot. Kew Gard. Misc. 1: 252. (1849)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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