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green threads, Hopi tea, Hopi tea greenthread, rayless greenthread

hairy greenthread, Navajo tea

long-stalk greenthread, rayless greenthread

Habit Perennials or subshrubs, (20–)30–80+ cm. Perennials, 10–30(–40+) cm (caudices often woody). Perennials or subshrubs (may flower first year), 20–40+ 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.

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.

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

0.

0, or 8;

laminae yellow, (6–)12–20+ mm.

0.

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.

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.

of 5 ovate bractlets 1–3 mm.

Cypselae

5–8 mm;

pappi 1–2(–3) mm.

5–7 mm;

pappi usually 0, rarely 0.1–0.5 mm.

2–3 mm;

pappi usually 0, rarely 0.1–0.3+ mm.

2n

= 22, 44.

= 22, 24.

= 40.

Thelesperma megapotamicum

Thelesperma subnudum

Thelesperma longipes

Phenology Flowering (Apr–)May–Oct. Flowering May–Sep. Flowering (Mar–)Apr–Oct.
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" Openings in desert scrub, limestone ridges
Elevation 300–2900 m [1000–9500 ft] 1000–2900 m [3300–9500 ft] 500–2100 m [1600–6900 ft]
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.)

Distribution
from FNA
AR; AZ; CO; KS; NE; NM; OK; SD; TX; UT; WY; South America; Mexico (Chihuahua, Coahuila)
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CO; MT; ND; NM; NV; UT; WY; AB
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM; TX; Mexico (Coahuila, Nuevo León, San Luis Potosí, Tamaulipas)
[WildflowerSearch map]
[BONAP county map]
Parent taxa Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Thelesperma Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Thelesperma Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Thelesperma
Sibling taxa
T. ambiguum, T. burridgeanum, T. filifolium, T. flavodiscum, T. longipes, T. nuecense, T. simplicifolium, T. subnudum
T. ambiguum, T. burridgeanum, T. filifolium, T. flavodiscum, T. longipes, T. megapotamicum, T. nuecense, T. simplicifolium
T. ambiguum, T. burridgeanum, T. filifolium, T. flavodiscum, T. megapotamicum, T. nuecense, T. simplicifolium, T. subnudum
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) A. Gray: Smithsonian Contr. Knowl. 3(5): 109. (1852)
Source Flora of North America vol. 21, p. 202. Flora of North America vol. 21, p. 201. Flora of North America vol. 21, p. 201.
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