STREPTANTHOID GENERA. 225 
belong to the arid interior; the species of one of them ranging 
between Arizona and Texas, not far to the northward of the 
Mexican boundary; those of another, far more numerous, occur 
at many different stations all the way between the Rocky Moun- 
tains of Colorado and Wyoming on the one hand, to the Cas- 
cades and Sierra Nevada on the other. A third is typically 
Californian. 
The genus of altogether southerly range I name 
DISACCANTHUS. Calyx of thin texture, but notas in Huclisia, 
inflated in the middle and closed at the summit, two larger sepals 
distended at base and saccate. Pods broad and flat ; seeds broad 
thin, wing-margined. Plants of a thinnish foliage, the basal 
leaves (early disappearing) runcinate-pinnatifid, and forming a 
rosulate tuft, the cauline cordate-amplexicaul. 
The few species may take names as follows: 
D. CARINATUS. Streptanthus carinatus, C. Wright. Calyx 
purple, all four sepals saccate, and more notably so than in other 
species. Pods 24 inches long, 2 lines wide.—The original from 
a cañon 60 miles below El Paso, Texas. 
D. varpus. Plant stout, rigid, with few rigidly ascending 
branches: pods oblong-linear, very large, 14-2 inches long, fully 
4 lines wide, obtuse. —Type from somewhere in western Texas, 
1884, by M. E. Jones, who mistook it for Streptanthus platy- 
carpus, Gray. ' 
D. Mogottonicus. Calyx very thin, creamy white, sepals less 
notably saccate: pods 3 inches long, barely a line wide.—Type 
collected by myself among foothills of the Mogollones in New 
Mexico, 30 March, 1881. All white-flowered material from New 
Mexico from Las Cruces to the upper Gila belongs here. 
D. LUTEUS. Flowers wholly of a clear yellow.—A more north- 
erly species, of the Black Range, New Mexico, known only in 
flowering specimens collected in 1905 by O. B. Metcalfe. 
D. Arizonicus. Streptanthus Arizonicus,Wats. Plant more 
delicate than in other species; no rosula if basal leaves; stem 
slender, simple; flowers nearly white.—Mountains of southern 
Arizona. 
