276 LEGUMINOSAE (PEA FAMILY) 



elongating in fruit; flowers blue, subverticillate, standard glabrous; bracts 

 minute or wanting; pedicels 5-8 mm. long, stout in fruit: pods villous- 

 pubescent, 2.5-4 cm. long, normally 6-seeded. A vernal species of moist 

 slopes protected by undershrubs; Wyoming and Colorado. 



22. Lupinus laxiflorus Dougl. in Lindl. Bot. Reg. pi. 1140. 1828. Ascend- 

 ing or erect, 3-6 dm. high, the slender tufted stems simple; pubescence mi- 

 nute, silky, appressed : stipules very small, setaceous ; leaflets 6-8, ob lanceolate, 

 3-5 cm. long, pubescent on both sides, at least half as long as the petioles: 

 racemes loose and slender; flowers verticillate or scattered, rather small, on 

 pedicels 4-5 mm. long: calyx narrowed and saccate at base; the upper lip 

 short-toothed, the lower subentire: petals blue, equal, 6-10 mm. long; banner 

 subpubescent, and the keel ciliate: pod silky-hairy: seeds 3-5. (The follow- 

 ing are segregates from L. laxiflorus, and may or may not be distinct: L. argo- 

 phyllus, L. argenteus argophyllus Wats. Proc. Am. Acad. 8: 532. 1873; L. 

 argentinus Rydb. Bull. Torr. Bot. Club 30: 257. 1903; L. comatus Rydb. 

 1. c.; L. pulcherrimus Rydb. 1. c. 258; L. laxus Rydb. 1. c.; L. leucanthus Rydb. 

 1. c. 259; L. Helleri Greene, Pitt. 4: 134. 1900.) New Mexico to Montana 

 and west to the coast States. 



23. Lupinus Bakeri Greene, Pitt. 4: 132. 1900. Densely tufted, erect, 

 5-9 dm. high, silvery or hoary pubescent throughout; stems rather stout, 

 often fistulous below: leaflets 7-9, lance-elliptical, acute, 3-5 cm. long, about 

 equally pubescent on the two faces: raceme solitary, rather short, subsessile; 

 the flowers of middle size and in rather distinct whorls, blue, with a spot on 

 the standard, turning red or purple: standard shorter than the wings or sub- 

 equal; the keel falcate, densely woolly-ciliate : pods 2-3 cm. long, velvety- 

 tomentose. (L. arceuthinus Greene, PL Baker. 3: 35. 1901.) Western Col- 

 orado. 



24. Lupinus ammophilus Greene, Pitt. 4: 136. 1900. Perennial from 

 horizontal rootstocks; stems not tufted, rather low and stout; the raceme and 

 peduncle usually longer than the stem: petioles and stem coarsely hirsute, 

 with long, spreading or reflexed hairs: leaflets 8-10, cuneate-obovate to ob- 

 lanceolate, glabrate above, sparsely hirsute beneath, 3-4 cm. long: raceme 

 large and showy; pedicels and gibbous calyx hirtellous: corolla about 1 cm. 

 long, purple; the standard with a light spot in the middle, this changing to 

 red; keel falcate, thinly woolly-ciliate: pods broad, 2-3 cm. long, densely 

 hirsute. Sandy banks; southern Colorado and New Mexico. 



25. Lupinus barbiger Wats. Proc. Am. Acad. 8: 528. 1873. Pubescence 

 of the stem, pedicels, and petioles short stiffish spreading hairs; that of the 

 leaves and calyx silky and subappressed : stems rather stout, 4-7 dm. high: 

 stipules setaceous; leaflets 5-7, narrowly oblanceolate, silky on both sides: 

 raceme rather dense, short-peduncled ; pedicels 4-5 mm. long; the setaceous 

 bracts longer than the calyx: lower calyx-lip narrow, subentire, exceeding 

 the broader, deeply toothed upper lip: petals ochroleucous or purplish, equal; 

 the standard rounded, silky; the keel copiously ciliate: ovules about 7. 

 Western and southern Colorado to Utah and southward. 



26. Lupinus Wyethii Wats. 1. c. Sparsely villous with spreading pubes- 

 cence throughout; stem ascending or erect, stout, often branching, 3-5 dm. 

 high, few-leaved: leaflets 8-12, oblong to oblanceolate, 4-6 cm. long, acute, 

 often glabrous above; the lower petioles much elongated: raceme 1-2.5 dm. 

 long, often long-peduncled ; bracts subulate-setaceous, exceeding the calyx; 

 flowers blue or pink, scattered or verticillate; pedicels 6-8 mm. long: calyx 

 villous, with short setaceous bractlets; upper lip 2-toothed; the lower one 

 longer, subentire: petals 10-14 mm. long, equal; the keel naked: ovules 7-8. 

 (L. amplus Greene, PL Baker. 3: 36. 1901.) From Colorado and Wyoming 

 to Oregon. 



27. Lupinus Burkei Wats. Proc. Am. Acad. 8: 525. 1873. Stout, nearly 

 glabrous, erect, branching, 5-10 dm. high: lower leaves long-petioled ; the 

 stipules .lanceolate ; leaflets 7-10, 5-10 cm. long, oblanceolate, acute, or the 

 lower ones obtuse, glabrous above, sparsely strigose beneath: raceme short 

 and dense; the pedicels short; flowers blue; bracts ciliate, somewhat persis- 



