Part 1, 1919] EABACEAE: PSORALEAE 47 



3. Psorothamnus Emoryi (A. Gray) Rydberg. 



Dalea Emoryi A. Gray, Mem. Am. Acad. II. 5: 315. 1854. 

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



A shrub, 1-2 m. high, intricately branched; branches white-velutinous when young, with 

 minute red or orange, in age brown, glands; leaves 1-9 cm. long, white-velutinous and sparingly 

 glandular-dotted; leaflets 1-13, from linear-oblong to elliptic or obovate, entire or sinuate, 

 5-20 mm. long, the terminal one usually much longer than the rest; peduncles 1-4 cm. long; 

 spikes head-like, short and dense, 12-15 mm. broad, 10-20-flowered; bracts lanceolate, 3-3.5 

 mm. long, villous and with red glands; calyx-tube turbinate, 2.5 mm. long; lobes subulate, 2.5-3 

 mm. long, villous; corolla dark-blue or bluish-purple; blade of the banner rounded-cordate, 

 slightly retuse, with a single gland, 4 mm. long, the claw 2 mm. long; blades of the wings 

 obliquely obovate, with a large rounded basal lobe, 4-5 mm. long, usually with a gland, 

 those of the keel-petals much broader, 5 mm. long; pod obliquely obovate, villous and with 

 many small red glands above, glabrous below, slightly exceeding the calyx-tube. 



Type locality: Tablelands of the Gila. Arizona. 



Distribution: Arizona, southern California, Sonora. and Lower California. 



Illustrations: Pacif. R. R. Rep. 5: pi. 11; Armstrong, Field Book W. Wild Fl. 249. 



4. Psorothamnus tinctorius (Brand.) Rydberg. 



Dalea linctoria Brand. Proc. Calif. Acad. II. 2: 147. 1889. 



A shrub, 1-2 m. high; branches divergent, grayish-velutinous and copiously glandular- 

 dotted when young; glands red turning dark-brown; leaves 1.5-3 cm. long, canescent and glan- 

 dular-dotted, early deciduous; leaflets 3-5, oval or elliptic, 4-10 mm. long, or the terminal one 

 oblong, 1-2 cm. long, mostly entire, rarely sinuate; peduncles 4-10 cm. long; spikes dense, sub- 

 globose, 1 cm. thick; bracts lanceolate, 3 mm. long, caducous; calyx-tube turbinate, strongly 

 10-ribbed, villous, with a row of 2 or 3 red glands in each interval, 2.5 mm. long; lobes lanceo- 

 late, 1.5 mm. long, gland-tipped; corolla dark-blue; blade of the banner suborbicular-cordate, 

 slightly retuse, 3 mm. long, the claw 2 mm. long; blades of the wings elliptic, with a rounded 

 basal lobe, those of the keel-petals broadly obliquely obovate, 4 mm. long, the claws of the 

 wing and keel-petals 2.5 mm. long; pod like that of P. Emoryi. 



Type locality: San Gregorio, Lower California. 

 Distribution: Lower California. 



5. Psorothamnus dentatus Rydberg, sp. nov. 



A shrub, with spreading branches, velutinous-canescent, and with numerous at first red, 

 in age almost black glands; leaves 3-7 cm. long, canescent and with numerous glands; leaflets 

 9-17, from obovate to oblanceolate, 1-2 cm. long, at least the larger coarsely dentate; peduncles 

 1-2 cm. long; spikes subglobose, about 1 cm. broad; bracts lanceolate, equaling the calyx; 

 calyx-tube turbinate, 3 mm. long, strongly 10-ribbed, with a row of 2-4 red glands in each 

 interval; calyx-lobes triangular-lanceolate, gland-tipped, 2 mm. long; corolla dark-blue; blade 

 of the banner orbicular, 3 mm. long, the claw 2 mm. long; blades of the wings elliptic, with a 

 rounded basal lobe, and a gland near the apex, those of the keel-petals obliquely rounded- 

 obovate, 3.5 mm. long, glandless, the claws of the wings and keel-petals 2 mm. long; pod 

 unknown. 



Tvpe collected at Santo Domingo, Lower California, September 26, 1905, Nelson & Goldman 

 7170 (U. S. Nat. Herb. no. 565256). 



6. Psorothamnus arenarius (Brand.) Rydberg, sp. nov. 



Dalea linctoria arenaria Brand. Proc. Calif. Acad. II. 2: 147. 1889. 



A shrub, with spreading branches, glabrous or nearly so, with conspicuous red glands; 

 leaves 3-7 cm. long, sparingly canescent and with scattered glands; leaflets 5-9, linear-lanceo- 

 late, sinuate-dentate, the terminal ones 1.5-3.5 cm. long, the rest 1-1.5 cm. long, 1-3 mm. wide; 

 peduncles 5-10 cm. long; spikes subglobose or short-oblong, 1 cm. thick; bracts lanceolate; 

 calyx- tube turbinate, nearly 3 mm. long, strongly 10-ribbed, with a row of 2-4 glands in each 

 interval, silky- villous; lobes lanceolate, 1.5 mm. long, gland-tipped; corolla blue; blade of the 



