Thelesperma megapotamicum |
Thelesperma nuecense |
|
---|---|---|
green threads, Hopi tea, Hopi tea greenthread, rayless greenthread |
Rio Grande greenthread |
|
Habit | Perennials or subshrubs, (20–)30–80+ cm. | Annuals, 30–70(–90+) cm. |
Cauline leaves | ± 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. |
± scattered over proximal 1/4–1/2(–3/4) of plant heights, internodes mostly 4–10 cm; lobes mostly linear to filiform, sometimes ± oblong, 25–50(–120) × 0.5–1+ mm. |
Ray florets | 0. |
8; laminae yellow to golden, usually proximally, sometimes almost wholly, suffused with red-brown or with a red-brown spot or band, 10–20+ mm. |
Disc corollas | yellow, often with red-brown nerves, throats shorter than lobes. |
red-brown, throats shorter than lobes. |
Calyculi | of 3–5+ ovate to oblong bractlets 1–2(–3) mm. |
of 6–7+ narrowly triangular bractlets 2–4 mm. |
Cypselae | 5–8 mm; pappi 1–2(–3) mm. |
5–5.5+ mm; pappi 0.5–1+ mm. |
2n | = 22, 44. |
= 20. |
Thelesperma megapotamicum |
Thelesperma nuecense |
|
Phenology | Flowering (Apr–)May–Oct. | Flowering Mar–Jul. |
Habitat | Disturbed places on sands or clays, oak/juniper woodlands, desert scrub, yellow-pine forests | Disturbed sites on sands |
Elevation | 300–2900 m (1000–9500 ft) | 0–200 m (0–700 ft) |
Distribution |
AR; AZ; CO; KS; NE; NM; OK; SD; TX; UT; WY; South America; Mexico (Chihuahua, Coahuila)
|
TX |
Discussion | 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.) |
Distinctions between Thelesperma nuecense and T. filifolium are subtle; they may be better treated as one species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 21, p. 202. | FNA vol. 21, p. 202. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Thelesperma | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Thelesperma |
Sibling taxa | ||
Synonyms | Bidens megapotamica, T. gracile | |
Name authority | (Sprengel) Kuntze: Revis. Gen. Pl. 3(2): 182. (1898) | B. L. Turner: Rhodora 61: 243. (1959) |
Web links |