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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]
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.)

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. burridgeanum, T. filifolium, T. flavodiscum, T. longipes, T. megapotamicum, T. simplicifolium, T. subnudum
Synonyms Bidens megapotamica, T. gracile
Name authority (Sprengel) Kuntze: Revis. Gen. Pl. 3(2): 182. (1898) B. L. Turner: Rhodora 61: 243. (1959)
Source Flora of North America vol. 21, p. 202. Flora of North America vol. 21, p. 202.
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