544 FLORA. 



times as long as the leaves; leaflets 5, or of the upper leaves 3, short-stalked, ob- 

 long-linear or oblanceolate, 2-4 cm. long, mostly obtuse or mucronulate at the 

 apex, narrowed or cuneate at the base; inflorescence spicate, interrupted, the blue 

 flowers short-pedicelled or sessile in clusters of 3-5; corolla 9-1 1 mm. long, ex- 

 ceeding the broad mucronate bracts; calyx-lobes acute; pod ovoid, flattish, pubes- 

 cent. Plains, S. Dak. to Kans. and Tex. June-July. 



9. Psoralea argoph^Ila Pursh. Silver-leaf Psoralea. (I. F. f. 2094.) 

 Densely silvery pubescent with white appressed hairs. Stem often zigzag, 3-9 dm. 

 high; stipules narrowly linear, 6-9 mm. long; leaflets 3-5, short-stalked, oval, 

 oblong or obovate, obtuse and mucronate or acutish, 1.5-3 cm. long; peduncles ex- 

 ceeding the leaves; inflorescence spicate, interrupted, the blue flowers sessile, about 

 9 mm. long, in clusters of 2-4; bracts lanceolate, slightly longer than the corolla, 

 persistent; calyx-lobes lanceolate; pod ovate, straight-beaked. Wis. and Minn, to 

 the N. W. Terr., Kans. and N. Mex. June- Aug. 



10. Psoralea cuspidata Pursh. Large-bracted Psoralea. (I. F. f. 

 2095.) Finely appressed-pubescent, at least above, 3-9 dm. high, from a deep 

 tuberous-thickened root. Petioles 3.5-5 cm. long; stipules linear, acuminate, 

 13-17 mm. long; leaflets 5, short-stalked, broadly oblanceolate or oval, obtuse and 

 commonly mucronate at the apex, narrowed or cuneate at the base, 2.5-5 cm - 

 long; spikes oblong, 3.5-8 cm. long; peduncles longer than the petioles; bracts 

 lanceolate, long-cuspidate, equalling or exceeding the bluish corolla; pod oval, 

 membranous, enclosed in the calyx. Plains, N. W. Terr, to S. Dak., Kans., Colo, 

 and Tex. May-June. 



11. Psoralea esculenta Pursh. Pomme Blanche. Prairie Apple or 

 Turnip. (I. F. f. 2096.) Rather stout, erect from a large farinaceous root or 

 cluster of roots, 1-5 dm. high, densely villous -pubescent with whitish hairs. Lower 

 petioles 2-4 times longer than the leaves; stipules lanceolate, 17-25 mm. long; 

 leaflets 5, short- stalked, obtuse, narrowed at base, 2.5-5 cm - l° n g 5 peduncles 

 equalling or longer than the petioles; spikes oblong, dense, 3.5-8 cm.' long; bracts 

 lanceolate or ovate, acute, 11-17 mm. long, nearly equalling the bluish corolla; 

 pod oblong, glabrous, about 5 mm. long, slightly wrinkled, enclosed in the calyx- 

 tube. Plains, Manitoba and Dak. to Neb. and Tex. June. 



T2. Psoralea hypogaea Nutt. Small Indian Bread-root. (I. F. f. 2097.) 

 Similar to the preceding, but smaller, nearly acaulescent, the stem hardly rising 

 above the ground, densely pubescent with appressed whitish hairs. Petioles 2-^ 

 times as long as the leaves; stipules oblong, acutish, about 13 mm. long; leaflets 5 

 sessile or nearly so, 2-3 cm. long, often mucronate-tipped, narrowed at the base 

 peduncles 1-8 cm. long; spikes dense, 13-25 mm. long; bracts ovate, acute 

 shorter than or nearly equalling the dull blue corolla; pod 11 mm. long or more 

 somewhat hirsute, slender-beaked. Plains, Neb. and Colo, to Tex. and N. Mex 

 May- J une. 



13. Psoralea stipulata T. & G. Large-stipuled Psoralea. (I. F. f. 

 2098.) Sparingly pubescent or glabrous, nearly glandless ; stems 3-6 dm. long. 

 Petioles shorter than the leaves; stipules ovate or lanceolate, about 13 mm. long; 

 leaves 3-foliolate; leaflets oval or elliptic, 2-5 cm. long, narrowed at the base, ob- 

 tusish at the apex, the terminal one on a stalk 6-13 mm. long; racemes dense, 

 2.5 cm. long or less; flowers purple, 9-11 mm. long; bracts ovate, acute or acumi- 

 nate, deciduous. In rocky places, Ohio, Ind. and Ky. June-July. 



14. Psoralea pedunculata (Mill.) Vail. Samson's Snakeroot. (I. F. f. 

 2099.) Erect, 3-5 dm. high, more or less pubescent and rough. Glands small 

 and inconspicuous; leaves petioled, 3-foliolate; petioles shorter than or equalling 

 the leaflets; stipules subulate; leaflets oblong-lanceolate, 3-8 cm. long, entire, 

 obtuse at each end. the apex mucronulate, the terminal one on a stalk 4-13 mm. 

 long ; racemes rather loosely flowered, 5-13 cm. long ; bracts ovate-lanceolate, 

 acuminate, deciduous, glandular; flowers purplish, about4 mm. long ; pod wrinkled 

 transversely. In dry soil, Kans. to Ind.. N. Car., Tex. and Fla. March-July. 



15. Psoralea Onobrychis Nutt. Sainfoin Psoralea. (I. F. f. 2100.) 

 Glabrous or slightly pubescent, 1-2 m. high. Glands few and small; stipules 

 subulate; petioles about equalling the 3-foliolate leaves; leaflets ovate-lanceolate. 

 5-10 cm. long, entire, rounded or truncate at the base, acuminate at the apex, the 

 terminal one on a stalk about 2.5 cm. long; racemes numerous, loosely flowered, 



