Picradeniopsis pringlei (Greenm.) B. G. Baldwin

Bahia pringlei Greenman, Proc. Am. Acad. 32: 309. 1897
A perennial with a slender rootstock; stem branching from the base, ascending, 2-3 dm. high, grayish-hirsute; leaves opposite or alternate, thrice ternately dissected into linear divisions, white or grayish hirsute-pubescent; peduncles 3-5 cm. long, solitary at the ends of the branches; involucre 6 mm. high, 15 mm. broad; bracts oblanceolate, acute, hirsute, in 3 series, the inner ones with scarious margins; ligules yellow, 6-7 mm. long, 2 mm. broad; diskflowers numerous; corolla-tube densely glandular, 2 mm. long, a little longer than the deeply campanulate throat; achenes 4 mm. long, 4-angled, obscurely striate, puberulent; squamellae about 8, obovate. 2 mm. long, thickened only at the base.
Type locality: Calcareous bluff near Tula, Hidalgo. Distribution: Hidalgo.