FABACEAE. 201 



5. S. traskiae Eastw. (in herb.). Stems sufifrutescent, erect, 

 4-18 dm. high, the branches appearing 2-ranked, pubescent at the 

 tips with short white hairs, becoming nearly glabrous; leaflets 3-4, 

 usually 3, 8-12 mm. long, linear, acute at both ends, on an elongated 

 finely pubescent rachis; umbels on slender peduncles shorter than 

 the leaves, with a linear bract, 2-5-flowered; flowers 1 cm. long; 

 calyx 5 mm. long, scantily pubescent, the teeth short, pointed; 

 corolla yellow; pod 3-4 cm. long, very slender, with a short very 

 slender tip, thinly pubescent. 



This species is related to S. distichum Greene, but differs in the 

 more elongated leaf-rachis, linear leaflets, nearly glabrous instead of 

 silky-canescent, and yellow instead of reddish flowers. It is found 

 on Santa Catalina and San Clemente Islands. The type (United 

 States National Herbarium no. 469581) was collected at Mosquito 

 Harbor, San Clemente Island, Trask 287. For the description of 

 this species and for valuable notes on the genus, I am indebted to 

 one of my students, Mr. Ralph Noddin. 



6. S. sericeum (Benth.) Greene. Slender, 3-6 dm. high, much 

 branched and ascending, having the habit of glabrum, but silvery 

 canescent with a close short silky pubescence; leaflets 3, cuneate- 

 oblong to linear, 12-15 mm. long; umbels few-flowered, sessile or 

 short-peduncled; flowers 6 mm. long; calyx half as long, with short 

 slender teeth. 



San Gabriel Mountains, Davidson; also in the Liebre, and 

 Tehachipi Mountains. 



7. S. glabrum (Torr.) Greene. Suffrutescent, tufted and reedy, 

 5-10 dm. high, erect or decumbent, nearly glabrous; leaflets mostly 3, 

 oblong to linear-oblong, 6-12 mm. long, obtuse or acute; umbels 

 numerous, sessile; flow^ers 6-8 mm. long, yellow, turning reddish; 

 calyx 3-5 mm. long; the teeth subulate, erect, slightly less than 

 half as long as the tube. {H. glabra Torr.) 



Common throughout our range in dry places below 3000 feet. 

 Flowering nearly the year round. 



8. S. dendroideum Greene. Shrubby, the stems erect, 2-5 cm. 

 thick, the branches numerous, short, their tips densely silky-pubes- 

 cent; leaflets 3-5, on a dilated rachis, 4-8 mm. long, oblong, obtuse; 

 umbels on peduncles shorter than the leaves, bractless, many- 

 flowered; flowers 7-8 mm. long; calyx 4 mm. long, densely pubescent, 

 the teeth short and blunt, hairy; pod 2-seeded, 11 mm. long, slightly 

 curved with a short tip. 



An insular species found from Santa Cruz Island to Santa Cata- 

 lina. 



9. PSORALEA L. 



Punctate with dots and heavy-scented perennial herbs 

 or rarely shrubby. Stipules free from the petiole. 

 Leaves pinnately 3-foliate or rarely palmately 3-5-foliate. 

 Calyx-lobes nearly equal, the upper often connate. 

 Keel united with the wings, broad and obtuse above. 

 Stamens diadelphous or monadelphous; anthers all alike. 

 Pod ovate, indehiscent, 1 -seeded. 



