52 LEGUMINOS^E. (PULSE FAMILY.) 



1. THERMOPSIS, K. Br. 



Calyx campanulate, cleft to the middle. Standard shorter than the oblong 

 wings, the sides reflexed : keel nearly straight, equalling the wings. Pod 

 linear to oblong-linear, much compressed, shortly stipitate or nearly sessile, 

 straight or incurved. Stout perennial herbs with erect clustered stems; 

 stipules free, leaflets entire. 



1. T. rhombifolia, Richardson. Stems angular, nearly smooth : stipules 

 as long as the petioles; leaflets obovate-cuneiform, silky-puberulent, at length 



1 nearly glabrous : bracts oval: pod alcate, recurved or pendulous, glabrous, 10 

 to 14-seeded. From Colorado northward, at the head-waters of the Platte, 

 Missouri, and Saskatchewan. 



2. T. montana, Nutt. Somewhat silky-pubescent, at length glabrous : 

 stipules exceeding the petioles ; leaflets oblonq-obovate to oblong, sparingly villous 

 beneath, smooth above: bracts mostly lanceolate : pod straight, erect, pubescent, 

 10 to 12-seeded. Torr. & Gray, Fl. i. 388. T. fabacea of Hayd. Rep. 1872. 

 T. fabacea, var. montana, of Bot. King's Exp., Hayd. Rep. 1870 and 1871, 

 and Fl. Colorado. From New Mexico to Washington Territory and east- 

 ward to the borders of Nebraska and Dakota. 



2. SOPHORA, L. 



Calyx-tube campanulate; teeth short. Petals nearly equal; standard broad. 

 Pod stipitate, terete or somewhat compressed. Ours are herbs ; leaves with 

 numerous entire leaflets ; stipules small or obsolete ; flowers white, in terminal 

 racemes. 



1. S. sericea, Nutt. Low, 6 to 12 inches high, more or less silky-canes- 

 cent : leaflets about 21, elliptic or cuneate-oval : racemes short, at first scarce 

 exserted beyond the leaves : calyx gibbous at base. High plains of Colorado 

 and northward along the plains of the Platte and the Missouri. 



3. LIT PIN US, L. LUPINE. 



Wings united above, enclosing the keel. Stigma bearded. Pod 2-valved, 

 compressed, coriaceous. Generally herbaceous ; stipules adnate to the 

 petioles. Flowers in terminal racemes, verticillate, or scattered, bracteate. 



1. Ovules several: cotyledons petioled in germination. LUPIN us proper. 

 Ours are all herbaceous perennials, with oblong pods. 



* Dwarf and cespitose : racemes usual/I/ short and dense : pods 3 to 4-seeded. 



1. L. CSBSpitOSUS, Nutt. Nearly stemless, silky-hirsute : raceme sessile, 

 shorter than the leaves ; bracts setaceous, deciduous : petals pale blue. Torr. 

 & Gray, Fl. i. 379. From the mountains of W. Colorado and Utah north- 

 ward to the head-waters of Snake and Yellowstone Rivers. 



2 L. aridus, Dougl. Pubescence villous, both loose and appressed : 

 leaflets oblanceolate : peduncles shorter than the leaves ; bracts nearly equalling 

 the calyx: petals purple; the standard elliptical. Sources of the Missouri, 

 to Washington, Oregon, and California. In low valleys. 



3. L. minimus, Dougl. Appressed silky-villous : leaflets obovate or 

 oblanceolate : peduncles equalling or exceeding the leaves ; bracts linear : petals 



