WOOTON AND STANDLEY FLORA OF NEW MEXICO. 269 



KEY TO THE SPECIES. 



Cauline leaves lance-linear, narrowed at the base; sepals about 



4 mm. long 1. E. longirostris. 



Cauline leaves oblong to cordate, clasping; calyx 8 mm. long or 

 more. 



Basal leaves toothed, the cauline obtuse; sepals purplish 2. E. crassifolia. 



Basal leaves pinnatifid, the cauline acute; sepals yellow 3. E. valida. 



1 Euklisia longirostris (S. Wats.) Rydb. Bull. Torrey Club 33: 142. 1906. 



Arabis longirostris S. Wats, in King, Geol. Expl. 40th Par. 5: 17. pi. 2. 1871. 



Streptanthus longirostris S. Wats. Proc. Amer. Acad. 25: 127. 1890. 



Type locality: "Growing in alkaUne soil at the Steamboat Springs near Washoe 

 City, about Humboldt Lake, Nevada, and on Stansbmy Island in Salt Lake." 



Range: Washington to Nevada and New Mexico. 



New Mexico: Aztec; Albuquerque. Upper Sonoran Zone. 



2. Euklisia crassifolia (Greene) Rydb. Bull. Torrey Club 33: 142. 1906. 



Streptanthus crassifolius Greene, Pittonia 3: 227. 1897. 



Type locality: "Frequent in the mountain districts of eastern California south- 

 ward, and in adjacent Nevada and Arizona." 



Range: California and Utah to New Mexico and Arizona. 



New Mexico: Carrizo Mountains; Aztec. Dry hills, in the LTpper Sonoran Zone. 



3-. EuMisia valida (Greene) Woot. & Standi. Contr. U. S. Nat. Herb. 16: 125. 1913. 



Disaccanthus validus Greene, Leaflets 1: 225. 1906. 



Disaccanthus mogollonicits Greene, loc. cit. 



Disaccanthus lutev^ Greene, loc. cit. 



Type locality: El Paso, Texas. 



Range: Western Texas and southern New Mexico. 



New Mexico: Mountains west of San Antonio; Silver City; Upper Corner Monu- 

 ment; Tres Hermanas; Tortugas Mountain; Bishops Cap; Kingston. Dry hills, in the 

 Lower Sonoran Zone. 



In the type of Disaccanthus luteuLS the flowers are of a deeper yellow than in the jjlant 

 of the Rio Grande region. Following his description of D. mogollonicus Doctor 

 Greene says: "All white-flowered material from New Mexico from Las Cruces to the 

 upper Gila belongs here." As a matter of fact none of these plants have white flowers, 

 but both the calyx and corolla are a pale, clear yellow. The type of Disaccanthus 

 mogollonicus was collected in the Mogollon Mountains (Greene in 1881); that of 

 D. luteus came from Kingston {Metcalfe 1593). 



9. DITHYRAEA Haw. Spectacle-pod. 



Erect branching canescent annuals with entire or pinnatifid leaves; flowers rather 

 large, white, 6 to 8 mm. long, in elongated terminal racemes; silicles laterally flattened, 

 each cell nearly orbicular, containing a single seed, indehiscent but separating at 

 maturity from the persistent septum. 



key to the species. 



Pods stellate-pubescent, not strongly veined; cauline leaves with 



sinuate teeth, at least near the base 1. D. wislizeni. 



Pods glabrous, conspicuously reticulate- veined; cauline leaves 



entire 2. D. griffithsii. 



1, Dithyraea wislizeni Engelm. in Wisliz. Mem. North. Mex. 96. 1848. 



Biscutelld wislizeni Brewer & Wats. Bot. Calif. 1: 48. 1878. 



Type locality: Sandy soil i-ear Valverde and Fray Cristobal, New Mexico. Type 

 collected by Wislizenus in 1846. 



