288 NORTH AMERICAN FLORA [Volume 24 



of the keel strongly incurved, obtuse; pod oblong-ovoid, rounded at the base, abruptly acumi- 

 nate at the apex, cross-reticulate, 1 cm. long, 4-5 mm. thick and wide. 



Type locality: Owl Creek Valley, Wyoming. 



Distribution: Wyoming. 



Illustrations: M. E. Jones, Rev. Astrag. pi. 30, f. 103; pi. 73. 



14. Cnemidophacos pectinatus (Dougl.) Rydberg. 



Phaca pedinata Hook. Fl. Bor. Am. 1: 141. 1831. 



Astragalus pectinatus Dougl.; Hook. Fl. Bor. Am. 1: 142, as a synonym. 1831. 



Tragacantha pedinata Kuntze. Rev. Gen. 947. 1890. 



Astragalus pectinatus plalyphyllus M. E. Jones, Contr. W. Bot. 10: 87. 1902. 



Ctenophyllum pedinalum Rydb. Bull. Torrey Club 32: 663. 1906. 



A cespitose perennial; stems several from an underground rootstock or root, 3-6 dm. high, 

 sulcate, sparingly strigose, strict; leaves spreading, 6-10 cm. long, the rachis sulcate above, 

 sparingly strigose; stipules connate at the base, 5-7 cm. long, the lower deltoid, the upper 

 lanceolate from a broad base; leaflets 9-17, spreading, narrowly linear, firm, strongly veined, 

 2-6 cm. long, about 2 mm. wide, obtuse, not articulate to the rachis; peduncles 3-10 cm. long; 

 racemes dense, 4—7 cm. long; bracts lanceolate, 4 mm. long; pedicels 2 mm. long; calyx 

 strigose, usually with black hairs, the tube 7-8 mm. long, 3-4 mm. broad, the teeth subulate, 

 2 mm. long; corolla ochroleucous or cream-colored, 18-20 mm. long; banner ovate, notched at 

 the apex, slightly arcuate; wings slightly shorter, the blade linear-oblong, with a reflexed basal 

 auricle; keel-petals 15-16 mm. long, the blade broadly lunate, shorter than the claw; pod 

 reflexed, oblong-ellipsoid, 1-2.5 cm. long, 5-6 mm. wide and thick, said to be fleshy when young, 

 the sutures prominent. 



Type locality: Pastures of the Saskatchewan. 

 Distribution: Saskatchewan to Kansas, Utah, and Montana. 



Illustrations: Hook. Fl. Bor. Am. pi. 54; M. E. Jones, Rev. Astrag. pi. 30, f. 104; Fl. Neb. 

 21: pi. 11, f. 75-78; Britt. & Brown, 111. Fl./. 2136; ed. 2./. 2539. 



15. Cnemidophacos troglodytus (S. Wats.) Rydberg. 



Astragalus troglodytus S. Wats. Proc. Am. Acad. 20: 362. 1885. 



A subacaulescent perennial, with a woody root and short cespitose caudex; stems very 

 short, covered by the imbricate stipules; leaves numerous, erect, about 1 dm. long, with com- 

 paratively long petioles; stipules lanceolate or ovate, 5 mm. long, hirsute; leaflets 13-17, oval 

 or obovate, silvery-silky, 5-10 mm. long; peduncles 15 cm. long, overtopping the leaves; 

 racemes short, 2-3 cm. long, dense; bracts linear-lanceolate, 5 mm. long, in age reflexed; 

 calyx hirsute, the tube 4 mm. long, the teeth subulate, 2 mm. long; corolla 8-10 mm. long; 

 banner obovate; wings shorter, the blade rombic-oblanceolate, acute; keel-petals strongly 

 arched, rounded at the apex; pod obliquely ovoid, 5-6 mm. long, 4 mm. wide and thick, loosely 

 pubescent, nearly orbicular in cross-section. 



Type locality: San Francisco Mountains, Arizona, near Cliff-dweller Ravine. 



Distribution: Known only from the type locality. 



Illustration: M. E. Jones, Rev. Astrag. pi. 62 (but cross-section of pod not correct). 



37. MICROPHACOS Rydb. Bull. Torrey Club 32: 663. 1905. 



Slender-stemmed perennial, subcinereous-strigose. Leaves pinnate, with linear or oblong 

 leaflets and broad stipules free from the petioles, but the lower more or less united with each 

 other. Flowers small, in lax elongate racemes. Calyx short-campanulate, with very short 

 teeth. Corolla purple, small, all petals strongly arched. Banner broadly obovate, almost 

 clawless, retuse. Wings shorter, the blade obliquely obovate, with a comparatively small basal 

 auricle. Keel-petals still shorter, similar, but broader, more oblique, and more truncate at the 

 apex. Pod small, inversely boat-shaped, i.e., upper suture prominent and curved, the lower 

 almost straight, flat or slightly sulcate, oval in dorsal view, coriaceous, cross-ribbed; seeds reni- 

 form, rather few. 



Type species, Astragalus gracilis as interpreted by Dr. Gray, i.e., Dalea parviflora Pursh. 



