442 NORTH AMERICAN FLORA [Volume 24 



Corolla purple; bracts ovate lanceolate or lanceolate. 

 Calyx more or less black -hairy. 



Calyx-lobes half as long as the tube or less. 29. A. goniatus. 



Calyx-lobes nearly as long as the tube. 30. A. Tarletonis. 



Calyx not black-hairy; calyx-lobes nearly as long as the tube. 31. A. agrestis. 



4. Chaetodontes 



Stems 2-5 dm. high; corolla white; stipules lanceolate. 32. A. Spaldingii. 



Stems less than 2 dm. high, with short internodes; corolla purple; stipules 



broadly deltoid. 33. A. Austinae. 



5. Lentiformes 



Racemes elongate, many-flowered, usually longer than the leaves. 34. A. Lyallii. 



Racemes short, rather few-flowered usually shorter than the leaves. 

 Terminal leaflet well developed as large as or larger than the rest. 



Leaves and branches villous; pod abruptly acute. 35. A. lentiformis. 



Leaves and branches strigose; pod more gradually acute. 36. A. Lemmoni. 



Terminal leaflet not developed, represented by the somewhat produced 



rachis. 37. A. Peckii. 



6. Breweriani 



One species. 38. A. Breweri. 



1. Mollissimi. Plant perennial, with a woody root, usually short-stemmed, almost 

 subacaulescent (except in A. giganteus, A. Hartmanii, A. orthanlhus, A. sanguineus and A. 

 Humboldtii); leaves densely pubescent, villous or velutinous, spreading; pod ovoid to oblong, 

 coriaceous, in some species incurved, thicker than wide, more or less sulcate, at least on the 

 upper suture; calyx cylindric, the teeth from half as long as the tube to nearly as long; corolla 

 purple, white, or yellowish, in one species crimson, the banner moderately arched to nearly 

 straight. 



1. Astragalus giganteus S. Wats. Proc. Am. Acad. 17: 370. 1882. 



Astragalus yaquianus S. Wats. Proc. Am. Acad. 23: 270. 1888. 



Astragalus texanus Sheldon. Minn. Bot. Stud. 1: 65. 1894. 



Astragalus giganteus yaquianus M. E. Jones, Rev. Astrag. 234 (as to type). 1923. 



A perennial, with a rootstock; stem 3-15 dm. high, flexuose, silky, in age with brownish, 

 tangled, appressed hairs; leaves short-petioled, 1.5-2 dm. long, ascending; stipules deltoid, 

 herbaceous, 5-8 mm. long; leaflets 21-31, oval or elliptic, acute or obtuse, 1.5-3.5 cm. long, 

 silky-tomentose with loosely appressed, tangled hairs; peduncles 1-2 dm. long, strict; racemes 

 dense, 5-15 cm. long; bracts lance-subulate, 5 mm. long; calyx silky-tomentose, the tube 

 7-8 mm. long, 3 mm. broad, the teeth subulate, 3 mm. long; corolla ochroleucous, about 2 cm. 

 long; banner narrowly obovate, nearly straight, slightly retuse at the apex; wings shorter, 

 narrow, the blade linear-oblong, with a large reflexed basal auricle; keel-petals much shorter, 

 about 1.5 cm. long, the blade strongly lunate, rounded at the apex, with a large broad auricle; 

 pod oblong-ovoid, abruptly acuminate, glabrous, 15-20 mm. long, 8 mm. thick, and 6 mm. 

 wide, somewhat reticulate, slightly sulcate on both sutures. 



Type locality: Fort Davis, Western Texas. 



Distribution: New Mexico, Chihuahua, and western Texas. 



Illustration: M. E. Jones, Rev. Astrag. pi. 59, f. 192. 



2. Astragalus Hartmanii Rydberg, sp. nov. 



Astragalus giganteus yaquianus M. E. Jones, Rev. Astrag. 234, in part (as to description and speci- 

 men). 1923. 



A perennial; stem 1 m. high or more, finely short-villous; leaves 2-3 dm. long, ascending; 

 stipules herbaceous, deltoid, acuminate, 1-1.5 cm. long; leaflets about 25, oval, 2.5-5 cm. long, 

 obtuse, silky on both sides, but glabrate in age; peduncles 1.5 dm. long or more; racemes about 

 1 dm. long; bracts subulate, about 1 cm. long; pedicels about 5 mm. long; calyx sparingly 

 silky, the tube about 1.5 cm. long, the teeth about 1 cm. long, subulate; corolla ochroleucous, 

 3.5-4 cm. long; banner narrowly obovate, only slightly arcuate, the margins reflexed; wings 

 shorter, the claw much exceeding the calyx-tube, the blade linear-oblong, nearly straight, with 



