PEA FAMILY 



497 



7. H. leptocarpa (T. & G.) Rydb. Annual; stem erect, simple or branched 

 at the base, with ascending branches, 1-3 dm. high; leaflets 9-19, glabrous or 

 nearly so, oblong to cuneate, 3-8 mm. long, notched at the apex; peduncles 3-7 

 cm. long; raceme few-flowered; calyx-tube and the lanceolate teeth each 2 mm. 

 long; corolla purplish, 8-10 mm. long; legume linear, 2.5-3 cm. long, straight or 

 nearly so, glabrous. A. leptocarpus T. & G, Dry soil: Tex. — Colo. — Ark', 

 Son. Mr-Ap. 



7. H. atratiformis Rydb, Perennial; stem 2-3 dm. high, erect, branched, 

 strigose; leaflets 13-19, oblong, strigose below, glabrous above, 4-6 mm. long; 

 peduncles 5-7 cm. long; raceme lax, 2-3 cm. long; calyx black-strigose; tube 

 about 2 mm. long; teeth subulate, 1 mm. long; corolla ochroleucous, about 7 

 mm. long; pod linear, straight, minutely strigillose. (?) A, straiurensis M. E. 

 Jones. Dry soil; s Utah. L, Son. 



24. TiUM Medic. 



Perennial caulescent herbs. Leaves alternate, with nearly free and distinct 

 stipules; leaflets numerous, entire. Flowers perfect, in racemes. Calyx cam- 

 panulate; teeth nearly equal, usually rather long. Corolla purple, white or 

 ochroleucous; banner with a rather broad, erect, often notched blade. Stamens 

 10, diadelphous; anthers alike. Pod narrow, tapering at each end, more or less 

 stipitate, usually membranous, 1-celled, obcordate, or inverted V-shaped in 

 cross-section, the lower suture strongly sulcate, rarely with a narrow partial 

 partition. Seeds numerous. 



1. T. eremiticum. 



2. T. atropuhescens. 



3. T. obscurum, 



4. T. arrectum. 



6. T. racemosum, 



7. T. scopuloram. 



8. T. Rusbyi. 



9. T. alpinum. 



Stipe exceeding the calyx; pod not incurved. 



Pod not black-hairy; corolla white or ochroleucous. 

 Pod erect, glabrous. 



Stipe much longer than the calyx. 



Stipe scarcely exceeding the calyx. 



Pod with a partial septum. 



Pod glabrous; stipe 3—4 mm, long. 

 Pod strigose; stipe 1 mm. long. 

 Pod without septum. 

 Pod reflexed. 



Plant villous; pod cordate in cross-section. 5. T. Drummondli, 



Plant appressed-pubescent or glabrous ; pod more or less triangular or inverted 



V-shaped in cross -section. 

 Pod 2-3 cm. long; corolla 15-20 mm. long. 

 Calyx not black-hairy ; pod straight. 

 Calyx black-hairy; pod arcuate. 

 Pod less than 1.5 cm. long; flowers 6-8 mm. long. 

 ^ Pod black-hairy ; corolla violet or purple. 

 Stipe shorter than the calyx or almost none; pod incurved. 

 Pod mottled ; plant green, very slender. 

 Stem slender, spreading. 



Raceme l~5-flowered, short; leaflets obovate or orbicular. 



10. T. sparsiftorum. 

 Raceme 5-lO-flowered; leaflets linear, 11. T. owyheense. 



Stems stout, erect; raceme 5-15-flowered. 



Leaflets obovate or orbicular. 12. T. variegatum. 



Leaflets narrowly elliptic. 13. T. naturitense. 



Pod not mottled; plant cinereous. 



Pod appressed-pubescent. 14. T. humistratum. 



Pod hirsute- villous, with spreading hairs. 15. T. desperatum, 



1- T. eremiticum (Sheld.) Rydb. Stems several, 2-4 dm. high, glabrous 

 or nearly so; leaflets 13-19, 8-12 mm. long, oblong to obovate, obtuse; peduncles 

 8-10 cm. long; raceme 5-10 cm. long, loosely 5-10-flowered; calyx strigose, with 

 black hairs; tube 5-6 mm. long; teeth subulate, 1-2 mm. long; corolla ochro- 

 leucous, 13-15 mm. long; stipe of the pod 10-12 mm. long; bod}' oblong, 1.5-2 

 cm, long and 5 mm. thick. Astragalus ererniticus Sheld. A.arreclus il. E. Jones. 

 A. boiseanus A. Nels. Moxintains and hillsides: Ida.— Ariz.™Nev. Son. 



2. T. atropubescens (Coult. & Fish.) Rydb. Stems several, erect, branched, 

 strigose or glabrous; leaflets 16-25, oblong, about 1 cm. long, obtuse, glabrate 

 above, strigose beneath; peduncles about 1 cm. long; raceme rather lax; calyx 

 strigose, with black hairs; tube about 4 mm. long; teeth lance-subulate, 1,5 mm. 

 long; corolla sidphur-yellow, 12-14 mm. long; body of the pod 15-18 mm. long, 



20 



