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

Colorado greenthread

Habit Perennials or subshrubs, (20–)30–80+ cm. Perennials or subshrubs, 10–30(–50) 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.

crowded to ± scattered over proximal 1/3–1/2 of plant heights, internodes mostly 5–50(–80+) mm;

lobes mostly linear to filiform, sometimes oblanceolate, (5–)15–75 × 0.5–1(–2) mm.

Ray florets

0.

usually 8, rarely 0;

laminae yellow, 4–8(–12+) 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 3–5+ ovate to oblong bractlets 1–3 mm.

Cypselae

5–8 mm;

pappi 1–2(–3) mm.

4–5+ mm;

pappi usually 1.5–2+ mm, rarely 0.

2n

= 22, 44.

= 44.

Thelesperma megapotamicum

Thelesperma ambiguum

Phenology Flowering (Apr–)May–Oct. Flowering Mar–Jun.
Habitat Disturbed places on sands or clays, oak/juniper woodlands, desert scrub, yellow-pine forests Disturbed sites on sands or clays
Elevation 300–2900 m [1000–9500 ft] 10–200 m [0–700 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.)

Thelesperma ambiguum is similar to T. megapotamicum; it may be better treated as a variety of the latter.

(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
NM; TX; Mexico (Nuevo León, Tamaulipas)
[BONAP county map]
Parent taxa 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. burridgeanum, T. filifolium, T. flavodiscum, T. longipes, T. megapotamicum, T. nuecense, T. simplicifolium, T. subnudum
Synonyms Bidens megapotamica, T. gracile T. fraternum, T. megapotamicum var. ambiguum
Name authority (Sprengel) Kuntze: Revis. Gen. Pl. 3(2): 182. (1898) A. Gray: Proc. Amer. Acad. Arts 19: 16. (1883)
Source Flora of North America vol. 21, p. 202. Flora of North America vol. 21, p. 201.
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