106 Flora of the Palouse Region 



P. lanceolata var. purshii Piper, n. comb. (P. purshii Vail.) Erect 

 or ascending, 30-60 cm. high, sparsely puberulent, coarsely glandnlar-dotted 

 throughout: leaflets 3, entire, narrowly or broadly oblanceolate, acute, ob- 

 tuse or emarginate at apex, cuspidate, 2-3 cm. long; petioles as long as the 

 leaflets: peduncles barely exceeding the leaves: racemes short, dense: flow- 

 ers bluish-white, 5 mm. long, short-pedicelled: calyx-teeth shorter than the 

 tube: pod subglobose, 5-6 mm. long, glandular and white-hairy. Sandy 

 banks of Snake River. 



172. ASTRAGALUS. 



Chiefly perennial herbs, a few woody at the base: leaves odd- 

 pinnate, with stipules: flowers in spikes or racemes: calyx with 5 

 nearly equal teeth: corolla and its slender-clawed petals usually 

 narrow, spreading,- equalling or exceeding the wings and blunt- 

 keeled: stamens diadelphous; anthers all alike: ovary sessile or 

 stipitate; ovules numerous: pod commonly turgid or inflated, 1-2- 

 celled by false partitions; seeds few or many. 



Densely white-hairy: flowers 8 mm. long. A. spaldixgii. 



Densely white hairy and woolly: flowers 20 mm. long. A. ixkeexes. 

 Not densely hair} - . 



Flowers and pods reflexed. A. collixis. 



Flowers reflexed: pods erect. A, mortoxi. 

 Flowers and pods erect. 



Pods with dorsal suture turned inwards. A. arrectis. 



Pods turgid. A. revextes. 



A. spaldingii Gray. Densely white-villous throughout: stem erect or 

 decumbent, 30-50 cm. high: leaves 6-10 cm. long, short-petioled; leaflets 10- 

 15 pairs, lanceolate, acute at each end, sessile, about 1 cm. long: pedicels 

 longer than the leaves: flowers white, in dense spikes, 2-6 cm. long: calyx 

 denselv-villous, the linear lobes as long as the campanulate tube: corolla 

 white, the keel purple-blotched, 7-S mm. long: pod villous, ovoid, beaked, 

 1-2-seeded, as long as the calyx. Not rare, on hillsides. 



A. inflexUS Dougl. Densely wbite-villous and tomentose throughout: 

 stems prostrate or decumbent, 10-30 cm. long: leaves short-petioled; leaflets 

 10-15 pairs, ovate, acuminate, short- stalked, about 1 cm, long: peduncles 

 shorter than the leaves: racemes rather densely few-flowered, the flowers 

 purple or yellowish, short-pedicelled: calyx-teeth awl-shaped, much shorter 

 than the cylindric tube: corolla purple, rarely yellowish, about 20 mm. long: 

 pod villous, stout-beaked, curved, 2-2.5 cm - hong. Sandy bars of Snake 

 River. 



A. COllinilS Dougl. C.I. cyrtoides Gray. 1 Erect, 30-50 cm. high, hoary- 

 pubescent throughout: leaves 5-10 cm. long; leaflets 5-10 pairs, oblong- 

 truncate or refuse, cuneate at base, short-stalked, about 1 cm. long, smoother 

 above: peduncles mostly terminal, longer than the leaves: flowers yellow, 

 reflexed, in racemes, 5-12 cm. long: calyx-tube oblong, campanulate, gib- 

 bous at base, 1 cm. long, the teeth short, triangular, acute: corolla 12-15 mm. 

 long; pods linear, acuminate, puberulent, 2-3 cm. long, 3 mm. wide, the 

 stipitate base as long as the calyx. Bluffs of Snake River, 



