Thelesperma simplicifolium |
Thelesperma longipes |
|
---|---|---|
Edwards Plateau greenthread, slender greenthread |
long-stalk greenthread, rayless greenthread |
|
Habit | Perennials or subshrubs (may flower first year), (20–)30–70+ cm. | Perennials or subshrubs (may flower first year), 20–40+ 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. |
mostly crowded over proximal 1/4–1/2 of plant heights, internodes mostly 5–25+ mm; lobes mostly linear to filiform, 5–25(–45+) × 0.5(–1) mm. |
Ray florets | usually 8, rarely 0; laminae yellow, 9–15(–20+) mm. |
0. |
Disc corollas | yellow with red-brown nerves, throats equal to or longer than lobes. |
yellow, sometimes with red-brown nerves, throats equal to or longer than lobes. |
Calyculi | of 6–8+ linear to subulate bractlets 1–3+ mm. |
of 5 ovate bractlets 1–3 mm. |
Cypselae | 3–4 mm; pappi usually 0, rarely 0.1–0.3+ mm. |
2–3 mm; pappi usually 0, rarely 0.1–0.3+ mm. |
2n | = 20. |
= 40. |
Thelesperma simplicifolium |
Thelesperma longipes |
|
Phenology | Flowering Apr–Jul(–Oct). | Flowering (Mar–)Apr–Oct. |
Habitat | Openings in oak/juniper woodlands or desert scrub, usually on limestone | Openings in desert scrub, limestone ridges |
Elevation | 100–1500 m (300–4900 ft) | 500–2100 m (1600–6900 ft) |
Distribution |
TX; Mexico (Chihuahua, Coahuila, Nuevo León, Tamaulipas)
|
AZ; NM; TX; Mexico (Coahuila, Nuevo León, San Luis Potosí, Tamaulipas)
|
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. | FNA vol. 21, p. 201. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Thelesperma | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Thelesperma |
Sibling taxa | ||
Synonyms | Cosmidium simplicifolium, T. curvicarpum | |
Name authority | (A. Gray) A. Gray: Hooker’s J. Bot. Kew Gard. Misc. 1: 252. (1849) | A. Gray: Smithsonian Contr. Knowl. 3(5): 109. (1852) |
Web links |