42 NORTH AMERICAN FLORA [Volume 24 



Leaflets 1-7, oblong or elliptic. 4. P. Fremontii. 



Leaflets 5-1 1, linear or linear-oblanceolate. 5. P. Johnsoni. 



Leaflets more or less decurrent and the upper ones eon- 

 fluent; corolla dark-blue. 6. E. calif ornicum. 

 Leaves, calyces, and branches sparingly short-hirsute or 



glabrate; body of the pod 12 mm. long. 7. P. Saundersii. 



Calyx-lobes nearly similar, all lance-subulate and equaling the 

 tube; leaflets linear. 

 Branches and leaves strigose when young; leaflets less than 1 



cm. long; pod not conspicuously hoary. 8. P. amoenum. 



Branches and leaves sparingly short-hirsute when young, soon 

 glabrate; leaflets more than 1 cm. long; pod conspicuously 

 hoary. 9. P. pubescens. 



Leaves simple. 



Leaves narrowly linear; glands of the calyx scattered; ovules 2. 



Branches bright-green and glabrate; leaves sparingly pubescent; calyx 



5 mm. long. 10. P. Schotlii. 



Branches and leaves densely canescent-strigose when young, the former 



yellowish; calyx 4 mm. long. 11. P. puberulum. 



Leaves broader, the lower obovate, spatulate or oblanceolate, toothed, the 

 upper spatulate or oblanceolate, entire; calyx with a solitary gland in 

 each interval ; ovules 4— 6. 12. P. spinosum. 



1. Psorodendron Kingii (S. Wats.) Rydberg. 



Dalea Kingii S. Wats. Bot. King's Expl. 64. 1871. 

 Parosela Kingii A. Heller, Cat. N. Am. PI. ed. 2. 6. 1900. 



A divaricately branched, spinescent, and flexuose undershrub, with a creeping rootstock; 

 stems 1-3 dm. high; branches yellowish-green, sparingly strigose and conspicuously glandular- 

 dotted; leaves divaricate, 2-4 cm. long, strigose or in age glabrate; leaflets 3-9, oval or elliptic, 

 6-12 mm. long, obtuse at each end; racemes mostly 1 -flowered, the rachis produced and spin- 

 escent; bracts and bractlets subulate, about 1 mm. long; calyx sparingly strigose, conspicuously 

 glandular-dotted; tube elongate-turbinate, 4 mm. long; lobes 2 mm. long, acute, the upper 

 two broadly triangular, the others lanceolate; corolla bluish-purple; petals nearly equal, the 

 blades about 4 mm. long, the claws 2 mm. long; blade of the banner broadly obcordate, those 

 of the other petals obliquely obovate, with large rounded basal lobes; pod pubescent. 



Typb locality: Drifted sand. Hot Spring Mountains, Nevada. 



Distribution: Northern Nevada. 



Illustration: S. Wats. Bot. King's Expl. pi. 10, f. 1-3. 



2. Psorodendron arborescens (Torr.) Rydberg. 



Dalea arborescens Torr.; A. Gray, Mem. Am. Acad. II. S: 316. 1854. 

 Parosela arborescens A. Heller. Cat. N. Am. PI. ed. 2. 5. 1900. 

 Parosela neglecla Parish, Bot. Gaz. 55: 306. 1913. 



A shrub, 1- 1 .5 m. high, or a small tree ; branches villous-tomentose and with scattered sub- 

 ulate glands when young, in age gray, striate; leaves 2-4 cm. long, white-villous-tomentose; 

 leaflets 3-7, oval or obovate, obscurely glandular-dotted, 6-10 mm. long; racemes 2-5 cm. 

 long, 5-15-flowered; bracts subulate-filiform, 5 mm. long; pedicels 1-2 mm. long; bractlets 

 subulate; calyx densely villous-tomentose; tube turbinate, 4 mm. long; lobes 3-4 mm. long, 

 acuminate, the upper two lanceolate, the other three subulate; corolla ultramarine-blue; petals 

 subequal, the blades 7 mm. long, the claws 2 mm. long; blade of the banner obcordate, with 

 small rounded basal lobes, those of the other petals oval, with a large rounded basal lobe; 

 pod obliquely ovate, villous and conspicuously glandular-dotted, the body 1 cm. long, the 

 beak 6 mm. long. 



Type locality: Mountains of San Fernando, southern California. 

 Distribution: Mojave Desert, southern California. 

 Illustration: Bot. Gaz. 55: 307./. 3. 



3. Psorodendron Wheeleri (Vail) Rydberg. 



Parosela Wheeleri Vail, Bull. Torrey Club 24: 17. 1897. 



A low shrub, with short branches, in age straw-colored, strigose when young, with raised 

 glands; leaves 1-2.5 cm. long, strigose; rachis flattened; leaflets 5-7, obovate or oval, sparingly 

 strigose and conspicuously glandular-dotted, 5-8 mm. long, 3-6 mm. wide; racemes 2-8 cm. 



