142 LEGUMINOSJE. psoralen. 



PKTALOSTEMEN. 



calyx about equal, sparingly hirsute: pods glabrous, 4 lines long, with a 

 short erect beak, light with scattered brown glands and more or less 

 densely villous with white hairs: seeds globose, 3 lines long, light brown. 

 On sand banks along the Columbia river, to Idaho and Nevada. 



* * Leaves pinnately 3-foliolate. 



P. physodes Dougl. Hook. Fl. i, 136. Glabrous or with a lew weak, 

 mostly black hairs: stems slender, assurgent, 1-2 feet high, simple: leaves 

 3-foliolate; stipules lanceolate, acuminate, reflexed ; leaflets broadly 

 rhomboid-ovate, mostly acute, mucronate an inch long, glandular; pedun- 

 cles equalling or exceeding the leaves; flowers in capitate racemes; bracts 

 small, elliptical; calyx more or less villous with usually dark-colored 

 hairs, 4-5 lines long, becoming much inflated, lobes nearly equal, triangu- 

 lar, the margins ciliate with dark hairs; petals 5-6 lines long, white or 

 purplish, pods membranaceous, rounded, somewhat compressed, 3 lines 

 long; seeds grayish. In open woods and rocky hillsides, ^Vancouver Is- 

 land to California. 



P. melilotoides Michx. Fl. ii, 58. Hedysarum pedunculatum Mill. 

 Gardn. Diet, No. 17. Stems erect, 1-2 feet high, from a long rootstoek, 

 simple or branching from the base: stipules 2-8 lines long, setaceous: peti- 

 oles shorter than the leaflets ; leaves remote, 3-foliolate, rarely 4-5-folio- 

 late; leaflets 2 inches long, lanceolate, acute, rarely ovate and obtuse, gla- 

 brous except the veins and margins which are very sparingly hirsute; 

 peduncles much exceeding the leaves ; flowers in loose spikes : bracts 

 glandular, broadly ovate, much imbricated, the cuspidate apex longer than 

 the flowers; lobes of the calyx acute, glandular, the lower one the long- 

 est: pods orbicular, compressed, transversely wrinkled, beak minute, re- 

 curved: seed orbicular, flat, brown. Seattle, Washington (Piper) and the 

 Atlantic States. 



10 PETALOSTEMON Michx. Fl. ii, 48, t. 37. 



Herbaceous, mostly perennial glandular dotted plants with 

 unequally pinnate leaves with minute setaceous stipules, and 

 small flowers in dense terminal spikes or heads. Calyx often 

 glandular, 5-toothed, the teeth connivent, nearly equal. Petals 

 5, on filiform claws; 4 of them nearly similar, their claws united 

 to the stamen-tube quite to the summit, alternate with the stam- 

 ens, deciduous by an articulation, the upper one free, inserted at 

 the bottom of the calyx, the limb cordate or oblong, condupli- 

 cate. Stamens 5, monadelphous, the tube cleft. Ovary with 

 2 collateral ovules. Pod membranaceous, enclosed in the calyx, 

 indehiscent, 1 -seeded. 



l\ or natus Dougl. Hook. Fl. i, 138. Perennial; stems simple, 1-2 

 feet high, glandular-dotted: leaflets 5-9, obovate to narrowly oblong, 5-6 

 lines long, flowers in dense, long-peduncled terminal spikes, sessile, bright. 

 purple; Bracts lanceolate, acuminate, about equalling the flowers: calyx 

 densely silky-villous ; upper tooth as long as the tube, the others shorter: 

 ovary pubescent. Hillsides and old river banks, Eastern Oregon. 



Tribe j\ Astragalece. A dans. Erect or decumbent, herbaceous, 

 rarely suffrutescent, plants with unequally pinnate leaves and axillary 

 or radical, racemose or spicaie inflorescence, Corolla papilionaceous. 

 Stamens monadelphous. J y od continuous , turgid or inflated, rarely 

 flattened, often spuriously 2-celled or partly 2-celled by the intro- 

 flexion of one or both of the sutures, dehiscent^ several-seeded, rarely 

 reded. Radical incurved. 



