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

burridge's greenthread

Habit Perennials or subshrubs, (20–)30–80+ cm. Annuals, 30–40(–70+) 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 1/2–3/4 of plant heights, internodes mostly 5–40(–60+) mm;

lobes mostly linear to filiform, sometimes oblanceolate, 5–25(–45) × 0.5–1(–2+) mm.

Ray florets

0.

8;

laminae wholly red-brown to purplish or mostly red-brown with distal margins yellow to orange, 7–9(–12+) mm.

Disc corollas

yellow, often with red-brown nerves, throats shorter than lobes.

red-brown to purplish, throats shorter than lobes.

Calyculi

of 3–5+ ovate to oblong bractlets 1–2(–3) mm.

of 5–6(–9) linear to narrowly triangular bractlets 2–4 mm (margins hispido-ciliate).

Cypselae

5–8 mm;

pappi 1–2(–3) mm.

3.5–4 mm;

pappi 0.5–1+ mm.

2n

= 22, 44.

= 18.

Thelesperma megapotamicum

Thelesperma burridgeanum

Phenology Flowering (Apr–)May–Oct. Flowering Apr–Jun.
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] 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 burridgeanum may be a color-form of T. filifolium.

(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
TX
[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. ambiguum, T. filifolium, T. flavodiscum, T. longipes, T. megapotamicum, T. nuecense, T. simplicifolium, T. subnudum
Synonyms Bidens megapotamica, T. gracile Cosmidium burridgeanum
Name authority (Sprengel) Kuntze: Revis. Gen. Pl. 3(2): 182. (1898) (Regel) S. F. Blake: Proc. Biol. Soc. Wash. 41: 146. (1928)
Source Flora of North America vol. 21, p. 202. Flora of North America vol. 21, p. 202.
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