Psoralen. LEGUMINOSiE. 139 



The typical form is frequent in Washington Territory, Oregon, and Idaho, but seems not to have 

 been found in California. The variety is common in the Sierra Nevada from the Yoseiuite to 

 Sierra Co., Lcmmon. 



-f- +- Pubescence somewhat tomentose and more or less spreading : pod very short, the 

 body scarcely exceeding the calyx. 



24. H. tomentosa, Hook. & Am. Very pubescent : the stem covered with 

 spreading hairs, weak and liexuous, prostrate or ascending, a foot long or more : leaf- 

 lets 5 to 7, cuneate-ohlong to obovate, acute, 3 to G lines long : umbels on short 

 bracteolate peduncles, or the uppermost sessile : flowers 3 or 4 lines long : calyx 

 half as long or more, very villous ; the teeth lax, filiform, as long as the tube. — 

 Bot. Beechey, 137; Torr. & Gray, Fl. i. 324. Syrmatium tomentosum, Yogel in 

 Linncea, x. 591. 



In dry places near the coast, from San Francisco to Monterey. 



25. H. Heermanni, Durand <fc Hilgard. Less densely pubescent : the stem 

 nearly glabrous, much branched and spreading : leaflets smaller, 2 to 4 lines long : 

 umbels on short peduncles or often sessile : flowers smaller, 2 or 3 lines long : calyx 

 less villous, half as long ; the filiform teeth about equalling the tube. — Pacif. R. 

 Rep. v. G, t. 4. 



Sand-hills near San Francisco (Filch) and southward to San Diego. 



9. PSORALEA, Linn. 



Calyx-lobes nearly equal, or the lower one larger ; the two upper often connate. 

 Keel broad and obtuse above, united with the wings. Stamens diadelphous or 

 sometimes monadelphous : anthers uniform. Pod ovate, indehiscent, 1-seeded, 

 thick and often wrinkled, sessile. — Perennial herbs (our species), punctate with 

 dark glandular dots; leaves digitate or pinnate, mostly 3 - 5-foliolate, the leaflets 

 entire ; stipules not aduate to the petiole ; flowers white or purplish, in axillary 

 pedunculate spikes or racemes, with mostly membranaceous and deciduous bracts. 



A genus of about 100 species, found in all temperate and tropical regions, but most numerously 

 in North America and Southern Africa. Of the 80 North American species, most are confined to 

 the eastern and southern portions of the United States. 



* Leaves pinnately 3-foliolate. 

 +- Stems prostrate, creeping : leaves large, orbicular. 



1. P. orbicularis, Lindl. Finely pubescent, the inflorescence villous ; hairs on 



the calyx mixed with short pedicellate glands j petioles one halt' to a fool long ; the 



leaflets 2 to 1 inches in diameter, somewhat cuneate at base : peduncles equalling or 



exceeding the leaves (1 to ■'! feet bigh), hearing a close villous spike of large flowers ; 



bracts large, deciduous: calyx 5 to y lines long, cleft nearly to the base ; the lower 



tooth much the longest and about equalling the purplish corolla : standard oblong, 



exceeding the narrow wings and keel: stamens diadelphous: pods ovate, acute, 



c pressed, 3 lines long. — Bot. Reg. t. 1U71 ; Torr. in Bot. Wilkes Exp. 2G9. 



Usually in moist places, from Plumas Co. (Mrs. .lines) and Bolinas Hay (Kellogg) to San Diego 

 Co., Palmt r. 



+■ +- Stems erect. 



2. P. strobilina, Hook. & Am. Two or three feet high, more or less villous 

 and pubescent throughout; the stem, peduncles, and petioles glandular: petioles 3 

 or 4 inches long; leaflets rhombic-ovate, softly pubescent beneath, more glabrous 

 above, about 2 inches long ; stipules large, membranaceous, acuminate : peduncles 

 shorter than the leaves : Mowers in short oblong spikes; bracts very large, decidu- 

 ous : calyx half an inch long or more : lower tooth much the longest and at ll >-: 



