PEA FAMILY 457 



pubescent, straight, about 10-seeded. In woods: Colo. — Utah — N.M. Sub- 

 mont. — Mont. Je-Jl. 



4. T. xylorrhiza A. Nels. Stem erect, 4-7 dm. high, glabrate and striate; 

 stipules ovate or obovate, 2-4 cm. long; leaflets oval or elliptic, 4-8 cm. long; 

 raceme 10-20-flowered, dense; pod sparingly pubescent, somewhat arcuate, 4-6 

 cm. long. Shady slopes: Ida. Mont. 



5. T. divaricarpa A. Nels. Stem erect, 5-8 dm. high; stipules large, ovate, 

 or on the branches narrower, 2-5 cm. long; leaflets rhombic-oblanceolate or 

 elliptic, glabrous above, pubescent beneath, 5-10 cm. long; coroUa fully 2 cm. 

 long; pod linear; finely pubescent, about 15-seeded. Creek banks and open 

 slopes: Wyo. — Colo. Submont. — Subalp. Je-Jl. 



6. T. arenosa A. Nels. Stems several, 2-4 dm. high, glabrous or slightly 

 pubescent above; stipules ovate to suborbicular, 2-4 cm. long; leaflets oblong, 

 oblanceolate, or obovate, 3-4 cm. long, glabrous on both sides, or sparingly hairy 

 beneath; pod spreading, 4-7 cm. long, more or less torulose, 8-13-seeded. Sandy 

 or gravelly places: Sask. — Colo. — Mont. Plain — Mont. 



7. T. rhombifolia (Nutt.) Richards. Stems several, glabrous or strigose 

 above, 1-3 dm. high; stipules ovate to suborbicular, 1-2 cm. long, often obtuse; 

 leaflets rhombic-obovate to oblong-oblanceolate, 2-3 cm. long; corolla 15-20 mm. 

 long; pod 5-6 cm. long, grayish strigose, 10-13-seeded. Sandy places, especially 

 in draws: Sask. — Neb. — Colo. — Mont. Plain — Submont. Ap-Je. 



8. T. annulocarpa A. Nels. Stems single or two, 2-4 dm. high, strigose; 

 stipules broadly ovate or rhombic, 2-3 cm. long; leaflets elhptic, oblong or broadly 

 oblanceolate, mostly obtuse, 3-5 cm. long; pod often forming a nearly complete 

 ring, 7-10 cm. long, strigose-canescent, 7-12-seeded. Among rocks: Wyo. 

 Mont. Je. 



3. LUPINUS (Tourn.) L. Lupine, Wolf's Bean, Blue Bonnet, - 



Quaker Bonnet. 



Annual or perennial herbs, or rarely shrubs. Leaves alternate, with narrow 

 stipules, digitately 5-15-foliolate, rarely 1- or 3-foliolate. Flowers perfect, in 

 terminal racemes. Calyx 2-lipped, the upper lip of 2 partially, and the lower of 

 3 partially or usually wholly united sepals. Corolla in most of our species blue, 

 purple, or white, in a few yellow; banner broad, with reflexed margins; wings 

 curved; keel sickle-shaped. Stamens monadelphous; anthers alternately larger 

 and smaller. Pods flat, 2-valved, dehiscent; ovules and seeds 2-many. 



Perennials with rootstocks; cotyledons petioled after germination. 

 Plant tall, 3 dm. high or more. 

 Stem with appressed hairs. 



Leaves glabrous above, at least in age. 

 Flowers large, over 12 mm. long. 



Stem rather low and stout, canescent-strigose ; leaflets broadly ob- 

 lanceolate. I. Plattenses. 

 Stem glabrous or almost so, tall; leaflets narrowly oblanceolate. 



X. POLYPHYLLI. 



Flowers small, less than 12 mm. long. II. Pahviflori. 



Leaves permanently pubescent above. 



Flowers yellow or ochroleucous. V. Sulphurei. 



Flowers blue, purple, or wliite. 



Calyx produced backwards into a distinct spur or sack. 



Spur of the caljx 2-3 mm. long. III. Calcarati. 



Spur of the calyx 1 mm. long or less. IV. Argophylli. 



Calyx merely gibbous at the base, not produced backwards. 



Plant green, usually not densely hairy; pubescence short, or if 

 longer, very sparse. 

 Keel moderately curved, limate, the upper portion longer than 



the lower. VI. Albicaules. 



Keel strongly curved, the upper portion shorter than the lower. 



VII. FOLIOSI. 



Plant densely silvery or canoscent with long hairs. 

 Stem leafy; pubescence of the leaves appressed. 



VIII. Ornati. 

 Stem leafy at the base only, pubescence of the leaves longer and 

 looser. XIV. Lepidi. 



Stem with spreading pubescence. 



