LEGUMINOSAE (PEA FAMILY) 275 



either naked or somewhat pubescent. Seemingly extending from Dakota 

 and Nebraska to the plains of the Columbia. The more silky-hairy form is 

 known as var. argophyllus. 



15. Lupinus decumbens Torr. Ann. Lye. N. Y. 2: 191. 1828. Closely 

 allied to the preceding, but the stems stouter, freely branched, often 7-10 dm. 

 high, very leafy: leaflets green, glabrous or nearly so above, short-pubescent 

 beneath: racemes several to many, dense and many-flowered. Abundant 

 throughout our range on the plains, especially adjacent to the streams. 



16. Lupinus alsophilus Greene, Pitt. 4: 135. 1900. Tall, branching, 

 green and seemingly glabrous: leaves few and large; leaflets about 8, spatu- 

 lately oblanceolate, obtuse, mucronate, glaucescent beneath, green and 

 glabrous above, 5-7 cm. long, 12-16 mm. broad above the middle: racemes 

 5-10 cm. long, on slender peduncles; flowers violet: calyx with very short 

 tube: petals equal, 6-8 mm. long, the keel short, broad and blunt, the margin 

 naked: pods densely villous. Subalpine; in the mountains of Western Col- 

 orado. 



17. Lupinus alpestris A. Xels. Bull. Torr. Bot. Club 27: 127. 1899. Stems 

 tufted on a branched persistent cauclex, 4-6 dm. high, simple or corymbosely 

 branched above, striate, short-pubescent: leaflets oblong to oblanceolate- 

 cuneate, mostly obtuse at apex and with a cusp, minutely appressed-pubescent 

 or nearly glabrous above; the lower petioles much longer than the leaflets; the 

 uppermost shorter: racemes terminal on stem and branches; flowers small to 

 medium, in rather loose verticils: corolla blue with purple spot on standard: 

 pod silky-hirsute, 2-3 cm. long, about 5-ovuled: seeds very flat, oval, 4 -mm. 

 long. In moist woods in mountains of our range, at middle or subalpine sta- 

 tions. 



18. Lupinus pseudoparviflorus Rydb. Mem. X. Y. Bot. Card. 1: 232. 

 1900. Stems solitary or several from woody caudex, erect, 3-6 dm. high: 

 stipules lanceolate; petioles slender, the lower twice as long as the leaflets; 

 leaflets 8-10, oblanceolate, 3-5 cm. long, acute or mucronate, finely strigose 

 beneath, glabrate above: raceme loosely flowered, 7-14 cm. long: calyx 

 appressed-silky, very gibbous at base: corolla blue, about 1 cm. long; the 

 standard very broad, a little shorter than the wings: ovules 4-6. (L. Jonesii 

 J. \V. Blank.' Mont. Agr. Coll. Sc. Stud. 1: 79. 1905.) Northern Wyoming, 

 Montana, and Idaho. 



19. Lupinus rubricaulis Greene, PI. Baker. 3: 35. 1901. Stems tufted, 

 slender, 3-5 dm. high, mostly simple, rather remotely leafy, dark red-purple 

 as are to some extent the leaves and petioles also: leaflets 78, cuneate-oblong 

 or elliptical, unequal, 3-5 cm. long; the slender petioles much longer; stipules 

 small, subulate: racemes sessile, 7-10 cm. long, rather dense, the middle- 

 sized flowers scattered: calyx white-silky, very gibbous at base: corolla blue- 

 purple; the standard shorter than the other j)etals; keelfalcate, glabrous. Very 

 near the preceding; but distinguished by its reddish hue. Colorado and Wyo- 

 ming. 



20. Lupinus monticola Rydb. Mem. N. Y. Bot. Gard. 1: 232. 1900. Stems 

 numerous from a branched woody caudex, 1-2 dm. high, grayish-strigose : 

 lower petioles often longer than the leaflets; the upper often much shorter; 

 leaflets 7-9, oblanceolate, 2-4 cm. long, silky, strigose or somewhat hoary on 

 both sides: raceme 3-6 cm. lon^; pedicels, bracts, and calyx silky-villous: 

 upper calyx-lip 2-cleft, the lower entire: corolla glabrous, 8-10 mm. long; 

 the standard broad, dark blue as are also the wings; keel lighter, strongly 

 curved: ovary silky, with 4-6 ovules. Alpine; northern Wyoming and in 

 Montana. 



21. Lupinus humicola A. Nels. Bull. Torr. Bot. Club 25: 204. 1898. Per- 

 ennial; root stock branched, the low crowns covered with the scale-like dead 

 petioles: stems several from each crown, simple, erect or ascending, 3-6 dm. 

 nigh, finely but not densely appressed-pubescent throughout: leaflets 7-12, 

 usually 10 or 11, oblong-oblanceolate, cuspidate-acute, 4-7 cm. long; petioles 

 slender, elongated, radical 1.5-3 dm. long, cauline gradually shortened upward; 

 stipules linear-lanceolate, villous: racemes terminal, dense, 1-2 dm. long, 



