Thelesperma simplicifolium |
Thelesperma megapotamicum |
|
---|---|---|
Edwards Plateau greenthread, slender greenthread |
green threads, Hopi tea, Hopi tea greenthread, rayless greenthread |
|
Habit | Perennials or subshrubs (may flower first year), (20–)30–70+ cm. | Perennials or subshrubs, (20–)30–80+ 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. |
± scattered over proximal 1/2–3/4 of plant heights, internodes mostly 40–100 mm; lobes mostly linear to filiform, sometimes oblanceolate, 20–40(–50+) × 0.5–1(–2.5) 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, often with red-brown nerves, throats shorter than lobes. |
Calyculi | of 6–8+ linear to subulate bractlets 1–3+ mm. |
of 3–5+ ovate to oblong bractlets 1–2(–3) mm. |
Cypselae | 3–4 mm; pappi usually 0, rarely 0.1–0.3+ mm. |
5–8 mm; pappi 1–2(–3) mm. |
2n | = 20. |
= 22, 44. |
Thelesperma simplicifolium |
Thelesperma megapotamicum |
|
Phenology | Flowering Apr–Jul(–Oct). | Flowering (Apr–)May–Oct. |
Habitat | Openings in oak/juniper woodlands or desert scrub, usually on limestone | Disturbed places on sands or clays, oak/juniper woodlands, desert scrub, yellow-pine forests |
Elevation | 100–1500 m (300–4900 ft) | 300–2900 m (1000–9500 ft) |
Distribution |
TX; Mexico (Chihuahua, Coahuila, Nuevo León, Tamaulipas)
|
AR; AZ; CO; KS; NE; NM; OK; SD; TX; UT; WY; South America; Mexico (Chihuahua, Coahuila)
|
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.) |
Thelesperma megapotamicum sometimes persists after plantings outside its natural range in the flora area and may become established (e.g., in California). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 21, p. 201. | FNA vol. 21, p. 202. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Thelesperma | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Thelesperma |
Sibling taxa | ||
Synonyms | Cosmidium simplicifolium, T. curvicarpum | Bidens megapotamica, T. gracile |
Name authority | (A. Gray) A. Gray: Hooker’s J. Bot. Kew Gard. Misc. 1: 252. (1849) | (Sprengel) Kuntze: Revis. Gen. Pl. 3(2): 182. (1898) |
Web links |