Vor, I1.] PEA FAMILY. 281 
Plants acaulescent, or nearly so, low, spreading; roots tuberous. 
Leaflets oblong-cuneate. 11. P. esculenta. 
Leaflets linear-oblong. 12. P. hypogaea. 
Leaves pinnately 3-foliolate (the terminal leaflet stalked). 
Racemes short, on peduncles about equalling the leaves. 13. P. siipulata. 
Racemes spicate, elongated, much exceeding the leaves. 
Leaflets oblong-lanceolate, obtuse; pods 2’’ long, nearly orbicular. 14. P. pedunculata, 
Leaflets ovate-lanceolate, acuminate; pods 4'’-5'’ long, obliquely ovate. 15. P. Onobrychis. 
1. Psoralea lanceolata Pursh. Lance-leaved 
Psoralea. (Fig. 2086.) 
Psoralea lanceolata Pursh, Fl. Am. Sept. 475. 1814. 
Erect, or assurgent, nearly glabrous, much branched, 
densely dark-glandular, light green, 1°-2° high. Root 
not tuberous; petioles equalling or shorter than the 
leaves; stipules linear, 3//-4/’ long, early deciduous; 
leaflets 3, digitate, sessile, sometimes with a few scat- 
tered hairs, linear or oblanceolate, entire, varying from 
acute to obtuse or even emarginate at the apex, nar- 
rowed or cuneate at the base, 8’’-15’” long, 2’/—4/’ wide; 
peduncles slender; spikes dense, short, 4’/-6’’ thick, 6-10- 
flowered; bracts membranous, caducous; flowers bluish- 
white, 3/’ long; corolla 2-3 times as long as the calyx; 
pod subglobose, about 2’’ long, sparingly pubescent, or 
glabrous, punctate; seed globose, brown. 
In dry soil, Kansas to the Northwest Territory, west to 
Arizona, Washington and British Columbia. June-July. 
P. micrantha A. Gray; Torr. Pac. R. R. Rep. 4:77. 1856. 
Assurgent, 1° high or more, from a horizontal root 
or long slender rootstock often 3° in length; stems 
glabrous, with scattered brown glands, and often with 
broadly lanceolate or ovate scales at the base. Stip- 
ules setaceous; leaves 3-foliolate, crowded; leaflets 
linear or filiform-linear, 14’—2’ long, the basal ones 
oblong or cuneate-oblong; peduncles about the length 
of the leaves; flowers about 2/’ long, white or bluish 
in small heads or loosely scattered in short spikes; 
bracts minute; calyx somewhat pubescent, glandular, 
the lobes about equal; pod globose, over 214’ long, 
glabrous, light brownish with raised darker glands 
and a straight slender beak; seed globose, somewhat 
flattened when dry, brown, smooth and shining. 
Prairies, Nebraska to Arizona. June—Aug. 
Po 
ae 
3- Psoralea tenuiflora Pursh. Few- 
flowered Psoralea. (Fig. 2088.) 
Psoralea tenuiflora Pursh, Fl. Am. Sept. 475. 1814. 
Erect, finely appressed-canescent, especially 
when young, punctate, much branched, slender, 
2°-4° high. Root not tuberous; leaves short-peti- 
oled, digitately 3—5-foliolate; stipules subulate, 1//— 
2/’ long; leaflets very short-stalked, entire, oval, 
oblong or elliptic, 6’’-10’’ long, 134’/-3’ wide, ob- 
tuse and mucronulate at the apex, narrowed or cu- 
neate at the base; peduncles slender, longer than 
the leaves; racemes loosely 6-14-flowered, 1/—3/ 
long; bracts scale-like, persistent; flowers purplish, 
2’ long; corolla about twice the length of the 
calyx; pod ovate, glabrous, punctate, 2’/-3’’ long; 
seed ovoid, brown. 
Prairies, Illinois and Minnesota to Texas and So- 
nora, west to Colorado and Montana, May-Oct. 
