4. Psoralea Linearif˛lia T. & G. Narrow-Leaved Psoralea

Fig. 2494

Psoralea linearifolia T. & G. Fl. N. A. I: 300. 1838.

Erect, 1°-2° high, widely branching; stems not always glandular, glabrous, or sparingly pubescent with appressed hairs. Stipules 1 1/2"-3 1/2" long, lanceolate or setaceous; leaves sessile or short-petioled, 1-3-foliolate; leaflets 5"-15" long, 1 -2" wide, linear, rugose, glandular, glabrous or with a few appressed hairs; peduncles 1'-9' long; flowers blue, loosely scattered, 1-4 together on slender pedicels 2"-4" long; bracts 1" long, ovate, acuminate; mature calyx campanulate, 2" long, glandular, slightly pubescent; pod 4" long, narrowly ovoid or oblong, glandular, with a short stout straightish beak; seed flat, oblique, dark brown..

Prairies and hillsides, Nebraska and Colorado to Texas. May-Aug.

5. Psoralea Collina Rydberg. Nebraska Psoralea

Fig. 2495

Psoralea collina Rydberg, Fl. Neb. 21: 54. f. 6, 7. 1895.

Ascending or diffuse, somewhat grayish-pubescent, 1°-2° high. Stipules narrow, 1"-4" long; leaves 3-foliolate, or sometimes 5-foliolate; leaflets obovate or oblanceolate, mucronate, mostly glabrous above; bracts pointed, l 1/2"-2" long; peduncles slender, 1'-4'long; flowers about 3" long; calyx-segments linear-lanceolate, much shorter than the ovate pod, the lower one a little longer than the others; pod 2i"-3" long, tipped with a flat straight beak about l 1/2" long.

Hillsides, western Nebraska. July-Aug.

5 Psoralea Collina Rydberg Nebraska Psoralea 8375 Psoralea Collina Rydberg Nebraska Psoralea 838

6. Psoralea DigitÓta Nutt. Digitate Psoralea

Fig. 2496

Psoralea digitata Nutt.; T. & G. Fl. N. A. 1: 300, 1838.

Canescent with appressed hairs, slender, erect, widely branching, 1°-2° high. Petioles shorter than or sometimes a very little exceeding the leaves; stipules linear, 1 1/2"-2" long; peduncles much elongated, often 3-5 times as long as the leaves; leaflets 5, or of the upper leaves 3, digitate, short-stalked, oblong-linear or oblanceolate, 9"-18" long, 2"-3" wide, 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 4"-5" long, exceeding the broad mucronate bracts; calyx-lobes acute; pod ovoid, flattish, pubescent.

Prairies and hills, South Dakota to Colorado, Kansas and Texas. June-July.

7. Psoralea Argophřlla Pursh. Silver-Leaf Psoralea

Fig. 2497

Psoralea incana Nutt. Fraser Cat. Name only. 1813.

Psoralea argophylla Pursh, Fl. Am. Sept. 475. 1814.

Erect, widely branched, densely silvery pubescent with white appressed hairs throughout. Stem often zigzag, 1°-3° high; petioles shorter than or equalling the leaves; stipules narrowly linear, 3"-4" long; leaflets 3-5, digitate, very short-stalked, oval, oblong or obovate, obtuse and mucronate or acutish at the apex, narrowed or rounded at the base, 8"-15" long, 3"-6" wide; peduncles exceeding the leaves; inflorescence spicate, interrupted, the blue flowers sessile, about 4" long, in clusters of 2-4; bracts lanceolate, slightly longer than the corolla, persistent; calyx-lobes lanceolate; pod ovate, straight-beaked.

Prairies and plains, Wisconsin and Minnesota to North Dakota, Saskatchewan, Alberta, Missouri, Colorado and New Mexico. June-Aug.

7 Psoralea Argoph Lla Pursh Silver Leaf Psoralea 8397 Psoralea Argoph Lla Pursh Silver Leaf Psoralea 840