22 SYNOPSIS OF THE FLORA OF COLORADO. 



branched; lea-res palraately3-foliolate; leaflets y-V long, linear-lanceolate 

 or elliptical-oblong, rather obtuse, slightly mucronate, sessile; peduncles 

 longer than the leaves ; raceme short, 6-15-flowered ; calyx-teeth minute, 

 acute; corolla 3" long, bluish ; legumes globose, sparingly hirsute, cov- 

 ered with larger dark-brown glands. Hall & Harbour, 101; Dr. Smith; 

 B. H. Smith. Very abundant on the plains around Denver and Colorado 

 Springs, Porter. 



PSORALEA DIGITATA, Xutt. Ganesceut, diffusely branched, branches 

 slender; leaves 5-foliolate; leaflets cuneate-oblong and oblong-linear with 

 an abrupt, rigid point, If long, 2"-4" wide, smooth and minutely dotted 

 above, hirsute beneath, longer than the petioles; stipules lanceolate, re- 

 flexed; spikes short, interrupted, on very long peduncles, the clusters 

 3-6 flowered ; flowers sessile; bracts obcordate or reniforin ; calyx villous, 

 half as long as the corolla, segments ovate, acuminate, the lowest one 

 produced; vexillum roundish-obovate ; legume orbicular-ovate, com- 

 pressed, hirsute, not wrinkled; seeds ovate. Purgatory River, Dr. Bell. 



PSORALEA FLORIBUNDA, Nutt. Dr. Smith; B. H. Smith; Porter. 

 Abundant on the plains of the Platte, Coulter. Hall & Harbour, 102. 



PSORALEA ARGYOPIIYLLA, Pursh. Hall & Harbour, 103; Porter. 



PSORALEA CUSPIDATA, Pursh. (P. cryptocarpa, T. & G.) Stein l-2 

 high, terete, branched, canescent with appressed pubescence; leaves 

 5-foliolate; leaflets obovate or elliptical-oblong, I'-IJ' long, obtuse or 

 acutish, mucronate, about as long as the petiole, minutely dotted, pube- 

 scent; stipules subulate ; peduncles much longer than the leaves ; spikes 

 ovate or oblong, flower-clusters crowded; flowers blue; bracts lanceolate, 

 cuspidate, shorter than the flower; calyx large, somewhat inflated, gib- 

 bous at the base, conspicuously dotted, teeth triangular lanceolate, acu- 

 minate, two upper ones united to the middle, the lower one produced : 

 legume ovate, membranaceous, scarcely pointed, not wrinkled, hid in 

 the large calyx. Purgatory River, Dr. Bell. 



PSORALEA HYPOG^EA, Nutt. Acaulescent; root tuberous, oblong, edi- 

 ble, about I' long ; stemless, hirsute with whitish appressed hairs ; leaves 

 5-7 foliolate; leaflets linear-lanceolate or linear-oblong, usually acute, 

 I'-IJ' long, 2"-3" wide, nearly glabrous above; spikes capitate, on 

 peduncles much shorter than the petioles; bracts lanceolate; calyx 

 cleft below the middle, segments linear, acuminate, the lowest lanceo- 

 late, elongated ; corolla pale-blue ; banner o\>long, of the length of the 

 wings and twice as long as the keel. Sandy plains of Xorthern Colo- 

 rado. Rare. Greene. 



DALEA ALOPECUROIDES, Willd. Hall cO Harbour, 104; Dr. Smith; 

 Brandegee. 



DALEA LAXIFLORA, Pursh. Glabrous, 3-4 high, erect, branched 

 above; branches slender and spreading; leaflets 4-5 pairs, linear-ob- 

 long, 2"-3" long, %" wide, strongly dotted; spikes panicled, few-flow- 

 ered; flowers distant ; bracts very broad, almost orbicular, glandular, 

 coriaceous, glabrous, slightly cuspidate, embracing the flower; calyx 

 deeply cleft, teeth long, setaceous, beautifully plumose; corolla white, 

 keel twice as long as the wings, vexillum cordate, very small, sometimes 

 with 4 approximated glands near the middle. Hall & Harbour, 100. 



DALEA NANA, Torr., var. ELATIOR Torr. PI. Wright, I, p. 46. Stems 

 about 1 high, canescent with appressed pubescence, branching; branches 

 leafy to the to]); leaves remote; leaflets 2-3 pairs, oblong and obovate, 

 slightly apiculaU', clothed with silky, canesceut hairs, not dotted, H"-4" 

 long; spikes ovate, loosely-flowered, elongated and cylindrical in 



