Hartweg's Pricklyleaf

Thymophylla hartwegii (A. Gray) Wooton & Standley, Contr U. S. Nat. Herb. 16: 191. 1913.
llymenalherum Berlandieri Benth. PI. Hartw. 18. 1839. Not H. Berlandieri DC. 1836.
Hymenatherum Hartwegii A. Gray, PI. Wright. 1: 117. 1852.
Tageles aristata Klatt, Leopoldina 25: 109. 1889.
Dyssodia Hartwegii B. L. Robinson, Proc. Am. Acad. 49: 507. 1913.
A sparingly and minutely puberulent perennial, suffruticose at the base; leaves opposite,
2-3 cm. long, pinnatifid, with 5-7 filiform spinulose-tipped divisions; peduncles filiform,
3-5 cm. long; involucre turbinate, about 5 mm. high and nearly as broad, minutely pruinose-
puberulent, with 1-4 small lanceolate or subulate accessory bracts; principal bracts united and
wholly coalescent up to the triangular, short-acuminate free tips; glands 3-5; ligules 5 mm.
long, 1.5 mm. wide; disk-corollas 3 mm. long; tube shorter than the trumpet-shaped throat;
achenes fully 2 mm. long, hispidulous on the angles; squamellae 10, in 2 series, ihe inner 2
mm. long, awn-tipped, the outer 0.5-0.7 mm. long, oblong.
Type locality: Aguas Calientes.
Distribution: Arizona and New Mexico to Aguas Calientes.

Thymophylla berlandieri (DC.) Rydberg
Hymenaiherum Berlandieri DC. Prodr. 5: 642. 1836.
A low puberulent perennial, suffruticose at the base; stems diffusely branched, including the peduncles 1-1.5 dm. high, puberulent; leaves mostly opposite, crowded on the short branches, 1-2 cm. long, sparingly puberulent, pinnatifid, with 7-11 filiform spinulose-tipped divisions; peduncles about 3 cm. long; involucre 4-5 mm. high, 5-7 mm. broad, turbinate, with a few subulate, minute accessory bracts; principal bracts in two series, wholly coalescent below, the inner with ovate tips, the outer lanceolate, with the ciliate free margins decurrent to about the middle of the involucre; ligules 2-3 mm. long, 1 mm. wide; disk-corollas 2 mm. long; lobes ovate; achenes 2 mm. long, sparingly hispidulous on the angles; pappus double; inner