Thelesperma megapotamicum

(Sprengel) Kuntze

Revis. Gen. Pl. 3(2): 182. 1898.

Basionym: Bidens megapotamica Sprengel Syst. Veg. 3: 454. 1826
Synonyms: Thelesperma gracile (Torrey) A. Gray
Treatment appears in FNA Volume 21. Treatment on page 202. Mentioned on page 200, 201.

Perennials or subshrubs, (20–)30–80+ 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. Calyculi of 3–5+ ovate to oblong bractlets 1–2(–3) mm. Ray florets 0. Disc corollas yellow, often with red-brown nerves, throats shorter than lobes. Cypselae 5–8 mm; pappi 1–2(–3) mm. 2n = 22, 44.


Phenology: Flowering (Apr–)May–Oct.
Habitat: Disturbed places on sands or clays, oak/juniper woodlands, desert scrub, yellow-pine forests
Elevation: 300–2900 m

Distribution

V21-495-distribution-map.gif

Ariz., Ark., Colo., Kans., Nebr., N.Mex., Okla., S.Dak., Tex., Utah, Wyo., Mexico (Chihuahua, Coahuila), South America.

Discussion

Thelesperma megapotamicum sometimes persists after plantings outside its natural range in the flora area and may become established (e.g., in California).

Selected References

None.

Lower Taxa

None.
... more about "Thelesperma megapotamicum"
John L. Strother +
(Sprengel) Kuntze +
Bidens megapotamica +
Ariz. +, Ark. +, Colo. +, Kans. +, Nebr. +, N.Mex. +, Okla. +, S.Dak. +, Tex. +, Utah +, Wyo. +, Mexico (Chihuahua +, Coahuila) +  and South America. +
300–2900 m +
Disturbed places on sands or clays, oak/juniper woodlands, desert scrub, yellow-pine forests +
Flowering (Apr–)May–Oct. +
Revis. Gen. Pl. +
Thelesperma gracile +
Thelesperma megapotamicum +
Thelesperma +
species +