WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 269 
KEY TO THE SPECIES. 
Cauline leaves lance-linear, narrowed at the base; sepals about 
4mm, long............ 02222 eee eee eee eee ees ... 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 8S. Wats. in King, Geol. Expl. 40th Par. 5: 17. pl. 2. 1871. 
Streptanthus longirostris 8. Wats. Proc. Amer. Acad. 25: 127. 1890. 
TYPE Locauity: ‘‘Growing in alkaline soil at the Steamboat Springs near Washoe 
City, about Humboldt Lake, Nevada, and on Stansbury Island in Salt Lake.” 
Rance: Washington to Nevada and New Mexico, 
New Mexico: Aztec; Albuquerque. Upper Sonoran Zone. 
2. Euklisia crassifolia (Greene) Rydb. Bull. Torrey Club 83: 142. 1906. 
Streptanthus crassifolius Greene, Pittonia 3: 227. 1897. 
Tyre Locauity: ‘‘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 Upper Sonoran Zone. 
3. Euklisia valida (Greene) Woot. & Stand]. Contr. U. S. Nat. Herb. 16: 125. 1913. 
Disaccanthus validus Greene, Leaflets 1: 225. 1906. 
Disaccanthus mogollonicus Greene, loc. cit. 
Disaccanthus luteus Greene, loc. cit. 
TyPE LocaLity: El Paso, Texas. 
Rance: 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 luteus the flowers are of a deeper yellow than in the plant 
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.’’ Asa 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 to8 mm. long, in elongated terminal racemes; silicles laterally flattened, 
each cell nearly orbicular, containing a single seed, indéhisceunt 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. .....222 222 eee eee etnies 2. D. griffithsii. 
1. Dithyraea wislizeni Engelm. in Wisliz. Mem. North. Mex. 96. 1848. 
Biscutella wislizeni Brewer & Wats. Bot. Calif. 1: 48. 1878. 
TYPE LocaLity: Sandy soil near Valverde and Fray Cristobal, New Mexico. Type 
collected by Wislizenus in 1846. 
