Thelesperma megapotamicum |
Thelesperma subnudum |
|
---|---|---|
green threads, Hopi tea, Hopi tea greenthread, rayless greenthread |
hairy greenthread, Navajo tea |
|
Habit | Perennials or subshrubs, (20–)30–80+ cm. | Perennials, 10–30(–40+) cm (caudices often woody). |
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. |
mostly crowded over proximal 1/4(–1/2) of plant heights, internodes mostly 1–5(–35 mm); lobes mostly oblanceolate to linear, (5–)10–35(–45+) × (1–)2–3(–5) mm. |
Ray florets | 0. |
0, or 8; laminae yellow, (6–)12–20+ mm. |
Disc corollas | yellow, often with red-brown nerves, throats shorter than lobes. |
yellow, sometimes with red-brown nerves, throats equal to or longer than lobes. |
Calyculi | of 3–5+ ovate to oblong bractlets 1–2(–3) mm. |
of 7–9 deltate to lance-linear bractlets 2–4+ mm. |
Cypselae | 5–8 mm; pappi 1–2(–3) mm. |
5–7 mm; pappi usually 0, rarely 0.1–0.5 mm. |
2n | = 22, 44. |
= 22, 24. |
Thelesperma megapotamicum |
Thelesperma subnudum |
|
Phenology | Flowering (Apr–)May–Oct. | Flowering May–Sep. |
Habitat | Disturbed places on sands or clays, oak/juniper woodlands, desert scrub, yellow-pine forests | Openings in pinyon/juniper or yellow-pine forests, often on talus or "balds" |
Elevation | 300–2900 m (1000–9500 ft) | 1000–2900 m (3300–9500 ft) |
Distribution |
AR; AZ; CO; KS; NE; NM; OK; SD; TX; UT; WY; South America; Mexico (Chihuahua, Coahuila)
|
AZ; CO; MT; ND; NM; NV; UT; WY; AB
|
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.) |
As here circumscribed, Thelesperma subnudum includes plants that have been treated as distinct species and/or varieties (some of which have been treated as of conservation concern). See C. J. Hansen et al. (2002) for an alternate interpretation of T. subnudum. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 21, p. 202. | FNA vol. 21, p. 201. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Thelesperma | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Thelesperma |
Sibling taxa | ||
Synonyms | Bidens megapotamica, T. gracile | T. caespitosum, T. marginatum, T. pubescens, T. pubescens var. caespitosum, T. subnudum var. alpinum, T. subnudum var. marginatum, T. subnudum var. pubescens, T. windhamii |
Name authority | (Sprengel) Kuntze: Revis. Gen. Pl. 3(2): 182. (1898) | A. Gray: Proc. Amer. Acad. Arts 10: 72. (1874) |
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