PEA FAMILY 499 



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

 falcate, mottled. A. sparsiflorus A. Gray. Mountains: Colo. Suhmont. — 

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

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

 Ida. 



12. T. variegatum Rydb. Stems nimierous, 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. Suhmont. — 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 procimibent, 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; pedimcles 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. wide, long-hairy. A. desperatus M. E. Jones. Sandy river 

 banks: Utah — Colo. Son. 



25. DIHOLCOS Rydb. 



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-hke; bracts subulate. Calyx 

 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 mm. long; corolla white. 



1. D. decalvans. 

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



Body of the pod 12-1.5 mm. long; corolla usually purple. 2. D. bisulcatus. 



Body of the pod rarely 10 mm. long; corolla wliite 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 mm. long. 



3. D. scobinatulus. 

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

 stipe 3 mm. long. 4. D. Haydenianus. 



Pod not cross-ribbed; corolla 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 many-flowered; 

 calyx sparingly strigose, with black or white hairs; tube 4 mm. long; teeth almost 



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