Thelesperma filifolium

(Hooker) A. Gray

Hooker’s J. Bot. Kew Gard. Misc. 1: 252. 1849.

Illustrated
Basionym: Coreopsis filifolia Hooker Bot. Mag. 63: plate 3505. 1836
Synonyms: Thelesperma filifolium var. intermedium (Rydberg) Shinners Thelesperma intermedium
Treatment appears in FNA Volume 21. Treatment on page 202. Mentioned on page 200, 203.

Annuals (sometimes persisting), 10–40(–70+) cm. Cauline leaves crowded to ± scattered over proximal 1/2–3/4 of plant heights, internodes mostly 10–35(–50+) mm; lobes mostly linear to filiform, sometimes oblanceolate, 5–30(–55+) × 0.5–1(–3+) mm. Calyculi of 7–8+ linear to narrowly triangular bractlets (2–)4–8+ mm. Ray florets 8; laminae yellow to golden yellow (sometimes proximally suffused with red-brown), 12–20+ mm. Disc corollas red-brown or yellow with red-brown nerves, throats shorter than lobes. Cypselae 3.5–4+ mm; pappi 0.5–1(–2+) mm. 2n = 16, 18.


Phenology: Flowering Mar–Aug(–Oct).
Habitat: Disturbed sites on clays or sandy soils, rocky slopes, often on limestone
Elevation: 10–2200 m

Distribution

V21-499-distribution-map.gif

Ark., Colo., Kans., La., Miss., Mo., Nebr., N.Mex., Okla., S.Dak., Tex., Wyo., Mexico (Nuevo León).

Discussion

As here circumscribed, Thelesperma filifolium includes plants that others have treated as a distinct species or variety: T. intermedium or T. filifolium var. intermedium, characterized as plants mostly 10–40 cm (versus taller); internodes “relatively short” (versus longer); calyculus bractlets mostly 1/4–1/2 lengths of phyllaries (versus more than 1/2 as long); ray corollas yellow (versus “golden yellow”); disc corollas yellow (versus sometimes red-brown); distribution mostly north and west of the typical form (Colorado, Kansas, Nebraska, New Mexico, w Oklahoma, South Dakota, c and w Texas, Wyoming).

According to A. Cronquist (1980), Thelesperma trifidum (Poiret) Britton has been misapplied (e.g., M. L. Fernald 1950) to T. filifolium.

Selected References

None.

Lower Taxa

None.
... more about "Thelesperma filifolium"
John L. Strother +
(Hooker) A. Gray +
Coreopsis filifolia +
Ark. +, Colo. +, Kans. +, La. +, Miss. +, Mo. +, Nebr. +, N.Mex. +, Okla. +, S.Dak. +, Tex. +, Wyo. +  and Mexico (Nuevo León). +
10–2200 m +
Disturbed sites on clays or sandy soils, rocky slopes, often on limestone +
Flowering Mar–Aug(–Oct). +
Hooker’s J. Bot. Kew Gard. Misc. +
Illustrated +
Thelesperma filifolium var. intermedium +  and Thelesperma intermedium +
Thelesperma filifolium +
Thelesperma +
species +