Cheilanthes lemmonii (D. C. Eaton) Domin; Chrysochosma lemmonii (D. C. Eaton) Pichi-Sermolli

Stem scales weakly bicolored, margins brown, narrow, poorly defined, thin, sparsely ciliate-denticulate. Leaves 7--30 cm. Petiole black to dark brown, much shorter than blade, grooved or flattened adaxially, bearing scattered glands and a few scales near base. Blade linear-lanceolate, 2-pinnate-pinnatifid, 3--6 times longer than wide, abaxially with conspicuous white or pale yellow farina, scales absent, adaxially glabrous at maturity; basal pinnae usually slightly smaller than adjacent pair, ± equilateral, proximal basiscopic pinnules not greatly enlarged. Ultimate segments sessile, broadly adnate to costae; segment margins slightly recurved, rarely concealing sporangia. Sporangia containing 64 spores. 2 n = 60.

Sporulating summer--fall. Rocky slopes and cliffs, usually on granitic or volcanic substrates; 1000--1500 m; Ariz.; w Mexico.

According to E. Wollenweber (1984), Notholaena lemmonii shows remarkable infraspecific variability in the chemical composition of the farina. R. M. Tryon (1956) recognized two varieties of N . lemmonii . The type collection of the species came from southern Arizona, and all specimens from the flora area are N . lemmonii var. lemmonii . The disjunct N . lemmonii var. australis , known only from the Mexican states of Puebla and Oaxaca, probably represents a distinct species.