PEA FAMILY 499 



5-6 mm. long; pod strigose; stipe about 1 mm. long; body 6-8 mm. long, lunate- 



falcatej mottled. A, sparsiflorus A. Gray. Mountains: Colo. Submont.^- 

 Mont. Jl. 



11. T, owyheense (Nels. & Macbr.) *Rydb. Stems several, prostrate, 



spreading, strigillose; leaflets 5-13, linear; racemes exceeding the leaves; calyx 



strigillose; teeth one-third as long as the tube; corolla 8-10 mm. long, white; pod 



oblong-Unear, 10-18 mm. long, straight or slightly curved, strigillose; dorsal 



suture only slightly intruded. A. oivyheensis Nels. & Macbr. Sage-brush plains: 

 Ida. 



12. T. variegatum Rydb. Stems numerous, strigose, more or less mottled 

 with purplish brown; leaflets obovate to nearly orbicular, rounded or retuse at 

 the apex, thick, sparingly strigose, soon glabrate, 5-10 mm. long; raceme short, 

 5-15 flowered; calyx black-hairy; tube 2-2.5 mm. long; teeth subulate, 1-2 mm. 

 long; corolla ochroleucous, 6-7 mm. long; pod scarcely stipitate, about 2 cm. 

 long, 4 mm. broad, oblong, slightly arcuate, acute on the upper suture, mottled 

 with purplish brown and minutely strigose. Canons. Colo. SubrnonL — Mont. 



13. T. naturitense (Payson) Rydb. Perennial; stem grayish strigose; 

 stipules scarious, ovate, free; leaflets 9-11, narrowly elliptic, more densely 

 pubescent beneath, 6-7 mm. long; raceme short, subcapitate at first, 6-10- 

 flowered; calyx 7 mm. long, sparsely nigrescent; teeth triangular-subulate; 

 corolla 12-15 mm. long; banner white; wings and keel red-tipped; pod subsessile, 

 2 cm. long, 6 mm. wide, cordate in section, with red and purplish blotches. A, 

 naturitensis Payson. Mesas: W" Colo. Submont. 



14. T. humistratum (A. Gray) Rydb. Stems procumbent, 2-5 dm. long, 

 grayish strigose; leaflets 13-17, linear, linear-oblong, or oblanceolate, silky- 

 strigose on both sides, or glabrate above, 7-15 mm. long; peduncles 5-8 cm. long; 

 raceme 2-5 cm. long; calyx strigose with long hairs; tube 3 mm. long; teeth subu- 

 late, 4 mm. long; corolla 9-11 mm. long, violet, the banner with purple veins; 

 pod strigose, linear-lanceolate, 15-18 mm. long, arcuate. A. humistratus A. 

 Gray. Dry hills: N.M.— Calif.— s Colo. Son. Ap-Jl. 



15. T. desperatum (M. E. Jones) Rydb. Stems very short, covered with 

 the large scarious stipules; leaflets 11-15, narrowly lanceolate to oval, 4-12 mm. 

 long, strigose on both sides; peduncles 3-10 cm, long; raceme rather lax, 2-6 cm. 

 long; calyx strigose; tube 4 mm. long; teeth subulate, 2 mm. long; corolla about 

 12 mm. long, purple, darker towards the tip; pod sessile, reflexed, falcate, 12 

 mm. long, 4 mm. w^ide, long-hairy. A. desperatus M. E. Jones. Sandy river 

 banks: Utah— Colo. Son. 



25. DIHOLCOS Rydb. 



r 



Stout erect perennial herbs, forming clumps. Leaves alternate, odd-pinnate, 

 with numerous thick leaflets, strigose beneath, glabrous above; stipules lanceo- 

 late, free. Raceme many-flowered, dense, spike-like; bracts subulate. Cslyx 

 campanulate, gibbous at the base on the upper side; teeth subulate-setaceous. 

 Corolla purple, white, or ochroleucous. Pod coriaceous, stipitate, oblong, 

 straight, rounded on the lower suture, deeply 2-grooved above and with a promi- 

 nent upper suture, 1-celled. 



Pod glabrous; body about 1.5 cm. long; upper calyx-teeth 3-4 mra. long; corolla white. 



1. D. decalvans. 

 Pod strigose; upper calyx-teeth less than 3 mm. long. 



Body of the pod 12-15 mm. long; coroUa usuaUy purple. 2. D, bisulcatus. 



Body of the pod rarely 10 mm. long; corolla white or straw-colored, only the keel 



sometimes tipped with purple. 



Pod distinctly cross-ribbed. 



Corolla more than 1 cm. long; pod very acute at both ends; stipe 5 nun. long. 



3. D. scobinatulus . 



Corolla less than 1 cm. long; pod obtusish or abruptly acuminate at both ends; 



stipe 3 mm. long. 4, £). Haydenianus. 



Pod not cross-ribbed; coroUa 6 mm. long. 5. D. micranthus. 



1. D. decalvans (Gand.) Rydb. Stem 3-6 dm. high, sparingly strigose or 

 glabrate; leaflets 19-29, oval or elliptic, 1-2 cm. long; raceme manj'-flowered; 

 calyx sparinelv strieosc, with black or white hairs; tube 4 mm. long; teeth almost 



