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Edwards Plateau greenthread, slender greenthread

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

Habit Perennials or subshrubs (may flower first year), (20–)30–70+ cm. Perennials or subshrubs, (20–)30–80+ cm.
Cauline leaves

± scattered over proximal 3/4+ of plant heights, internodes mostly 45–95 mm;

lobes mostly linear to filiform, sometimes oblanceolate, (5–)15–45(–60) × 0.5–1(–2) mm.

± 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.

Ray florets

usually 8, rarely 0;

laminae yellow, 9–15(–20+) mm.

0.

Disc corollas

yellow with red-brown nerves, throats equal to or longer than lobes.

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

Calyculi

of 6–8+ linear to subulate bractlets 1–3+ mm.

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

Cypselae

3–4 mm;

pappi usually 0, rarely 0.1–0.3+ mm.

5–8 mm;

pappi 1–2(–3) mm.

2n

= 20.

= 22, 44.

Thelesperma simplicifolium

Thelesperma megapotamicum

Phenology Flowering Apr–Jul(–Oct). Flowering (Apr–)May–Oct.
Habitat Openings in oak/juniper woodlands or desert scrub, usually on limestone Disturbed places on sands or clays, oak/juniper woodlands, desert scrub, yellow-pine forests
Elevation 100–1500 m (300–4900 ft) 300–2900 m (1000–9500 ft)
Distribution
from FNA
TX; Mexico (Chihuahua, Coahuila, Nuevo León, Tamaulipas)
[WildflowerSearch map]
[BONAP county map]
from FNA
AR; AZ; CO; KS; NE; NM; OK; SD; TX; UT; WY; South America; Mexico (Chihuahua, Coahuila)
[WildflowerSearch map]
[BONAP county map]
Discussion

Thelesperma simplicifolium is used in roadside plantings and may be encountered as a waif outside its natural range in the flora area (e.g., in California).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

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.)

Source FNA vol. 21, p. 201. FNA vol. 21, p. 202.
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. megapotamicum, T. nuecense, T. subnudum
T. ambiguum, T. burridgeanum, T. filifolium, T. flavodiscum, T. longipes, T. nuecense, T. simplicifolium, T. subnudum
Synonyms Cosmidium simplicifolium, T. curvicarpum Bidens megapotamica, T. gracile
Name authority (A. Gray) A. Gray: Hooker’s J. Bot. Kew Gard. Misc. 1: 252. (1849) (Sprengel) Kuntze: Revis. Gen. Pl. 3(2): 182. (1898)
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