18 ERYTHEA. 
cuneate-obcordate to obtusely-obovate: the upper oblanceo- 
late, acute and mucronate, the margins of all denticulate or 
serrulate, the shortest2 lines, the longest 5 lines long, the 
lowest glabrous, the uppermost often with a long silky pubes- 
cence beneath: filiform peduncle mostly solitary and appear- 
ing terminal; head round-ovoid, 4 inch high: calyx-tube sub- 
cylindrical, 10-nerved, glabrous, not quite half as long as the 
subulate-aristiform slender teeth, these glabrous in age, but 
in bud clothed with long villous or silky hairs. 
High Sierra in Alpine Co., California, Geo. Hansen, 1892. 
A fine new ally of T. longipes; rather diminutive. 
Trifolium Arizonicum. Annual, branching, the branches 
a foot long, ascending, stoutish and slightly fistulous, some- 
what flexuous, the internodes short; whole plant glabrous: 
leaves short-petioled; leaflets an inch long, linear and 
linear-lanceolate, spinulose-serrulate: peduncles 2 or 3 inches 
long: heads globose, about 8 lines in diameter, involucrate: 
calyx-tube campanulate, 10-nerved; teeth subulate, aristate- 
pointed, little exceeding the tube in length, strongly 1-nerved. 
Known only from specimens collected near Flagstaff, 
northern Arizona, by Dr. H. H. Rusby in 1883. Species 
related to the Californian 7. tridentatum, but a plant of 
peculiar aspect, and very marked characters of calyx. 
Thermopsis argentata. Rather slender, a foot or two in 
height; all the growing parts, and when young the whole 
plant silvery-canescent throughout with a very dense and 
minute silky pubescence, the mature parts also not indis- 
tinctly silky and pale: stipules $ to 14 inches long, from 
broadly to narrowly lanceolate and often slightly falcate: 
leaflets of the lowest leaves obtusish and of narrowly 
euneate-obovate outline, of the upper from oblanceolate to 
rhombic-obovate and very acute: raceme short and rather 
few-flowered: calyx-teeth triangular-subulate and about as 
long as the campanulate tube: petals of the wings and keel 
notably longer than the banner: pods long, spreading, 
silky-tomentulose. 
Modoe County, California, Milo S. Baker, 1893. 
