PEA FAMILY 461 



equalling the calyx, deciduous; calyx only slightly gibbous at the base; lips lance- 

 olate, about 8 mm. long; corolla pale blue; banner with a dark spot, about 12 

 mm. long; legume 2.5-3.5 cm. long. L. crassus Payson. Plains and hills : Neb. 

 Wyo. Colo. Kans. Plain Submont, Je-Jl. 



2. L. pseudoparviflorus Rydb. Stems several from a short woody caudex, 

 3-6 dm. high; leaflets 8-10, oblanceolate, 3-5 cm. long, acute or mucronate, 

 finely silk;y -strigose beneath; racemes 1-1.5 dm. long; bracts subulate, shorter 

 than the calyx, deciduous; corolla blue, 8-10 mm. long; banner lighter in the 

 middle, equalling the wings; legume 2 cm. long, 3-5-seeded. Open woods: 

 Mont. Ida. Plain Submont. My-Jl. 



3. L. stenophyllus (Nutt.) Rydb. Stem slender, probably 1 m. high; 

 leaflets about 5, 3 cm. long, green, sparingly silky-strigose beneath; bracts lance- 

 olate, shorter than the calyx, deciduous; calyx densely silky-strigose; upper lip 

 shorter than the lower; corolla light blue, 7-8 mm. long. Meadows: Mont. 

 Nev. Ore. Plain Submont. Jl. 



4. L. leucanthus Rydb. Stem about 6 dm. high; leaflets 5-7, narrowly 

 oblanceolate, 4-5 cm. long, acute or short-acuminate, sparingly appressed-hairy 

 beneath; raceme lax; bracts lanceolate, acuminate, about equalling the pedicels, 

 6-8 mm. long; lower lip of the calyx about one-third longer than the upper one; 

 corolla white, with a brownish spot on the banner, the latter glabrous. Meadows : 

 Utah. My. 



5. L. Scheuberae Rydb. Stem 4-6 dm. high; leaflets 7-8, oblanceolate, 

 5-7 cm. long, acute and mucronate, green, sparingly appressed-pubescent beneath; 

 racemes 1-1.5 dm. long, not dense; bracts lanceolate, 7-8 mm. long, deciduous; 

 flowers 10-12 mm. long; low r er lip fully twice as long as the upper; corolla 11-12 

 mm. long, dark purple but lighter towards the base; banner slightly longer than 

 the wings; pod 2-4-seeded, 2 cm. long. Woods: Mont. Wyo. Utah. Sub- 

 mont. Je-Au. 



6. L. laxispicatus Rydb. Stems 3-4 dm. high; leaflets 7-10, narrowly 

 oblanceolate, acute, green, strigose beneath, 4-5 cm. long; inflorescence lax; bracts 

 lanceolate, shorter than the calyx, deciduous; upper calyx-lip slightly shorter 

 than the lower; corolla blue, about 10 mm. long. Mountains: Ida. Utah. 



7. L. tenellus Dougl. Stems several, 4-6 dm. high; leaflets narrowly linear 

 or linear-oblanceolate, acute at both ends, silky-strigose beneath, usually con- 

 duplicate, 1-3 cm. long; raceme slender, lax; bracts lanceolate, shorter than the 

 buds; corolla blue; legume 3-5-seeded. L. Jonesii Blankinship, not Rydb. L. 

 Blankinshippii Heller. Meadows and hillsides: Wash. Calif. Colo. Mont. 

 Submont. Mont. My-Jl. 



8. L. argenteus Pursh. Stems diffusely branched, 5-10 dm. high; leaflets 

 7-8, narrowly oblanceolate and usually conduplicate, or in var. argentatus broader 

 and flat, 2-5 cm. long; bracts linear-lanceolate, about equalling the flower-buds; 

 lower lip of the calyx longer than the upper; corolla light vioLet, rose or white, 

 about 1 cm. long; legume about 2 cm. long, 5-6-seeded. L. decumbens Torr. 

 L. leptostachys Greene. Plains and hills : N.D. Neb. Colo. Calif. Ore. Plain 



-Mont. Je-Au. 



9. L. rubricaulis Greene. Stems from a short woody caudex, 3-5 dm. high; 

 leaflets 6-10, oblanceolate or elliptic, thick, acute, silky-strigose beneath, 2-3.5 

 cm. long; racemes short, 5-10 cm. long; corolla dark blue, about 8 mm. long; 

 pods about 2 cm. long. Moist open slopes: Colo. Mont. Jl. 



10. L. spathulatus Rydb. Stem 8-10 dm. high; leaflets 7, about 4 cm. 

 long, mucronate; bracts lanceolate, attenuate, deciduous, longer than the buds; 

 lower calyx-lip lanceolate, about twice as long as the upper; corolla dark blue, 

 with lighter keel, 8 mm. long. Canons: Colo. Utah. Mont. Je-Au. 



11. L. alpestris A. Nels. Stems erect, 4-6 dm. high; leaflets 5-9, from 

 narrowly linear-oblanceolate to ovate-oblanceolate, obtuse, mucronate, ! 



long, strigose beneath; racemes 1-2 dm. long, loosely flowered; upper calyx 

 lance-ovate, 5 mm. long; lower lip lanceolate, 6 mm. long; corolla usually 

 banner glabrous, 8-10 mm. long; keel slightly ciliate; legume 2-3 cm. long, 3-5- 



