109 ¢ 
Prof. M. E. Jones* claims that P. castorea and P. mephitica are 
identical, in which I can hardly concur, as the series of specimens 
examined seem to be very constant to the characters noted above. 
Utah—Beaver City, Palmer, No. 96 (1877), type. 
California—Mojave River, Parish Bros., No. 1283 (1882); Mojave 
Desert, Lemmon, No. 3119 (1884); near Colico, Mojave 
Desert, Lemmon (1884). 
§ 2. LEAVES PINNATELY 3-FOLIOLATE (RARELY UNIFOLIOLATE). 
Flowers in capitate or short, crowded, oblong spikes. 
Flowers small (5 mm. or in 2. simplex often 1 cm. long). 
Pods obliquely orbicular, transversely reticulate or wrinkled. 
Leaves 1-foliolate, leaflets linear-lanceolate, bracts setaceous. 
22. £. virgata. 
Leaflets and bracts lanceolate and pubescent. 
27 simplex, 
Pods ovoid, not reticulate. 
Plant low, branches trailing. 24. P. rhombifolia. 
Plant erect, leaflets ovate or orbicular, crenate-dentate. 
25. £. Americana, 
Flowers large (1-2 cm.), : 
Plants glabrous or nearly so. 
Flowers few, slender pedicelled ; pods obliquely ovate, reticulate, 
stems trailing, — 26. P. melanocarpa, 
Flowers in crowded heads; pods ovate, rough, 
hardly wrinkled. 27. £. rigida. 
Pods ovate, membranaceous, calyx inflated 
in fruit, 28. P. physodes. 
Leaflets elliptical, stipules large and 
foliaceous, 29. P. stipulatae 
Plants more or less tomentose or densely pubescent throughout ; 
bracts 15 mm. long, broadly ovate. jo. £. strobilina. 
Flowers in more or less elongated cylindrical spikes. cee 
Flowers small (5 mm.); plants glabrous or nearly so; pods transversely ee 
wrinkled. 
Leaflets 5 mm.—2 cm. broad, pods nearly 5 mm. long, nearly ee 
orbicular. or. P. pedunculata. 
Leaflets 244-6 cm. broad; pods nearly 1 cm. long, obliquely ovate, 
roughened with conical tubercles. ga. F- Onobrychis. 
Flowers large ( I-3 cm..). i 
Plants glabrous or nearly so, stems conspicuously roughened 
with elevated glands. ae SS ‘ 2 
Stems glabrous, inflorescence conspicuously villous ee 
with white hairs. 34% macrastachys, 
__ Stems prostrate, leaves orbicular or nearly so, very long 
a con RED rears. infloresence hapa hirsute, ace 
“208 a: 244 and 3: 285. a ee 
