Thymophylla acerosa

(de Candolle) Strother

Sida 11: 376. 1986.

Illustrated
Basionym: Dyssodia acerosa de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 641. 1836
Treatment appears in FNA Volume 21. Treatment on page 241. Mentioned on page 240.

Subshrubs or shrubs, green, to 25 cm, usually puberulent, sometimes glabrescent, rarely glabrous. Stems erect (branched from bases). Leaves mostly opposite; blades not lobed, linear to acerose, 10–18 mm. Peduncles 0–10 mm, puberulent or glabrous. Calyculi of 5 lance-linear bractlets, lengths 1/2+ phyllaries. Involucres campanulate to cylindric, 5–7 mm. Phyllaries ca. 13, margins of outer distinct less than 1/6 their lengths, abaxial faces puberulent or glabrous. Ray florets 7–8; corollas lemon-yellow, laminae 5–6 × 2–3 mm. Disc florets 18–25+; corollas pale yellow, 3–4 mm. Cypselae 3–3.5 mm; pappi of ca. 20 scales (each a fascicle of 3–5 bristles), 3–4 mm. 2n = 16, 24.


Phenology: Flowering through the year, mostly summer–fall.
Habitat: Calcareous outcrops, gypseous soils
Elevation: 1000–2000+ m

Distribution

V21-591-distribution-map.gif

Ariz., Nev., N.Mex., Tex., Utah, Mexico.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Thymophylla acerosa"
John L. Strother +
(de Candolle) Strother +
Dyssodia acerosa +
Ariz. +, Nev. +, N.Mex. +, Tex. +, Utah +  and Mexico. +
1000–2000+ m +
Calcareous outcrops, gypseous soils +
Flowering through the year, mostly summer–fall. +
Illustrated +
Dyssodia sect. Gnaphalopsis +, Dyssodia sect. Hymenatherum +  and Hymenatherum +
Thymophylla acerosa +
Thymophylla +
species +