Thymophylla aurantiaca (Brandeg.) Rydb.

Thymophylla aurantiaca (Brand.) Rydberg
Hymenatherum aurantiacum Brand. Zoe 5: 25S. 1908.
Dyssodia aurantiaca B. L. Robinson, Proc. Am. Acad. 49: 507. 1913.
A perennial, with a woody caudex; stems 1-2 dm. high; leaves alternate, 2-3 cm. long,
pinnatifid, with 5-7 linear divisions, glabrous, fleshy, with numerous glands; peduncles 1-1.5 cm.
long; involucre turbinate, 5 mm. high, 6-8 mm. broad, without calyculum; bracts 9-14, keeled
below, united to near the apex, with deltoid tips and 2-6 glands; ray-flowers about 6; ligules
yellow, 4 mm. long; disk-corollas 3 mm. long; tube shorter than the funnelform throat; achenes
2 mm. long, angled and striate; squamellae 8-10, ovate-lanceolate, divided into 3 bristles
(rarely with two minute additional bristles), the middle bristle much longer.
Type locality: Cerro de Santa Lucia, Puebla. Distribution: Puebla.