LEGUMINOSAE (PEA FAMILY) 273 



Raceme relatively short; stems tall. 



Flowers ochroleucous ..... 25. L. barbiger. 



Flowers blue or pink 26. L. Wyetbii. 



Whole plant glabrous or nearly so . . . . 27. L. Burkei. 



1. Lupinus pusillus Pursh, Fl. Am. Sept. 468. 1814. A low rather stout 

 diffusely branched annual, 1-2 dm. high, hirsute with spreading hairs: leaf- 

 lets usually 5, cuneate-oblong or oblanceolate, 2-3 cm. long, acute or obtuse, 

 nearly glabrous above, about half as long as the petioles: racemes short- 

 peduncled or sessile; pedicels 4-5 mm. long; the bractlets minute: upper 

 calyx-lip 2-cleft; the lower subentire: pods 10-15 mm. long, 1-2-seeded. 

 Throughout the whole Rocky Mountain region. 



2. Lupinus brevicaulis Wats. King's Rep. 53. pi. 7. 1871. Acaulescent and 

 somewhat caespitose, annual or seemingly sometimes perennial with slender 

 rootstocks, 3-10 cm. high: leaflets mostly 7, cuneate-obovate, 10-15 mm. 

 long, rounded at apex: racemes dense, 3-4 cm. long, the peduncles nearly 

 equaling the leaves; pedicels 2-4 mm. long in fruit; bractlets small: upper 

 calyx-lip very short or truncate, scarious; the lower subentire: petals blue, 

 6-10 mm. long, equal: pod 6-10 mm. long, 2-3-seeded. Southern Colorado 

 to Arizona and Oregon. 



3. Lupinus caespitosus Nutt. T. & G. Fl. N. A. 1: 379. 1840. Dwarf caes- 

 pitose perennial, 5-15 cm. high, silky hirsute: leaflets 5-7, oblong-lanceolate, 

 attenuate at base, much shorter than the petiole; stipules subulate, adnate: 

 spike sessile, densely flowered, much shorter than the leaves; bracts seta- 

 ceous, deciduous; flowers small, nearly sessile, pale blue: calyx bracteolate; 

 the upper lip 2-parted; the lower obscurely 3-toothed: pod villous, 3-4-seeded. 

 Colorado and Utah, north to Montana. 



4. Lupinus Kingii Wats. Proc. Am. Acad. 8: 534. 1873. From a peren- 

 nial rootstock, dwarf, caespitose, 7-15 cm. high ; pubescence villous and spread- 

 ing: leaflets oblong-lanceolate, 2-3 cm. long, acutish or obtuse, half as long 

 as the petioles : raceme on slender peduncles equaling the leaves ; bracts short : 

 calyx nearly equaling the petals; the lower lip equally 3-toothed: petals 

 purplish, 7-8 mm. long, the narrow rhomboidal standard shorter than the 

 wings: pod ovate, about 1 cm. long, 1-2-seeded. (L. Sileri Wats. 1. c. 10: 345. 

 1875; L. aduncus Greene, Pitt. 4: 132. 1900.) Colorado, Wyoming, and 

 Utah. 



5. Lupinus plattensis Wats. Proc. Am. Acad. 17: 369. 1883. Stems erect, 

 from an underground rootstock, appressed silky-villous, branched: leaflets 

 7-10, oblanceolate or short-spatulate, obtuse or sometimes subacute, usually 

 with a glaucescent hue, appressed-pubescent beneath, glabrous above: ra- 

 ceme elongated, loosely large-flowered: petals pale, blue or purplish; the 

 standard with a conspicuous darker spot. Western Nebraska and adjacent 

 Wyoming and Dakota. 



6. Lupinus dichrous Greene, PL Baker. 3: 35. 1901. Tufted, erect, 5-8 

 dm. high, the stems mostly simple; pubescence short, spreading, silvery: 

 racemes long, very open; flowers large, subverticillate ; pedicels and short 

 gibbous calyx velvety: corolla at first pale or nearly white, the standard soon 

 assuming a dark reddish-purple hue; keel lunate, strongly ciliate throughout: 

 pods oblong-linear, 3-4 cm. long, silky-tomentose, 5-seeded; the seeds white, 

 very flat. Probably rare; western Colorado. 



7. Lupinus ornatus Dougl. Lindl. Bot. Reg. 14. pi. 1316. 1828. Stems 

 often decumbent at base, ascending or erect, 4-8 dm. high; pubescence dense, 

 rather short, somewhat silky, subappressed : leaflets 5-7, oblanceolate or 

 cuneate-oblong, 3-5 cm. long, usually acute: racemes 1-2 dm. long, short- 

 peduncled; bracts short, subulate or ovate: calyx-lips nearly equal; the upper 

 short-toothed or bifid; the lower subentire: petals subequal, blue; the stand- 

 ard paler especially at the center, subsilky on the back; the keel ciliate: ovules 

 5-8: pod 4-5-seeded; the seeds small, white and polished. Western Wyo- 

 ming, northward and westward to the coast States. 



8. Lupinus leucophyllus Dougl. Lind. Bot. Reg. 13. pi. 1124. 1828. Stems 

 large, leafy, 6-9 dm. high, densely silky-tomentose throughout: stipules 



ROCKY MT. BOT. 18 



