284 NORTH AMERICAN FLORA [Volume 24 



Stem strict; leaflets well developed. 



Leaflets thin, elliptic or oval; corolla about 1.5 cm. long; pod 



cross-wrinkled. 5. C. adanus. 



Leaflets thick, linear. 2-3 cm. long; corolla 2-2.5 cm. long; 



pod smooth. 13. C. Grayi. 



Pod drooping; leaflets narrow, channeled, not articulate to the rachis. 14. C. pectinalus. 



I'lant acaulescent; pod 5-6 mm. long. 15. C. troglodytus. 



1. Cnemidophacos reventus (A. Grav) Rvdb. Bull. Torrey Club 

 40:52. 1913. 



Astragalus reventus A. Gray, Proc. Am. Acad. 15: 46. 1879. 

 Astragalus reventus Canbyi M. E. Jones. Contr. W. Bot. 8:11. 1898. 

 Phaca reventa Piper, Contr. U. S. Nat. Herb. 11: 372. 1906. 



A perennial, with a cespitose caudex; stem angled, sparingly pilose or glabrate, 1-2 dm. 

 high; leaves ascending, 1-1.5 dm. long; stipules deltoid, 4-5 mm. long; leaflets 25-31, oblong, 

 10—15 mm. long, 2-7 mm. wide, glabrous above, villous or pilose with curved hairs beneath, 

 obtuse or retuse at the apex; peduncles 1-2 dm. long, sparingly pilose; racemes about 5 cm. 

 long; bracts lanceolate, 3— 5 mm. long; flowers nodding in anthesis; calyx loosely pilose, more 

 or less black-hairy, the tube 7 mm. long, 3 mm. broad, the teeth subulate, 3 mm. long; corolla 

 white, fully 2 cm. long; banner broadly obovate, rather abruptly arched; wings with broadly 

 oblong blades; keel-petals much shorter, the blade broadly lunate; pod obliquely ovoid, cross- 

 wrinkled, about 2.5 cm. long, 1 cm. thick, glabrous, neither suture inflexed, the upper prominent. 



Type locality: Grand Valley and Blue Mountains. Oregon. 



Distribution: Northeastern Oregon. 



Illustration: M. E. Jones, Rev. Astrag. pi. 36, f. 119. 



2. Cnemidophacos reventiformis Rydberg, sp. nov. 



Astragalus reventus A. Gray, Proc. Am. Acad. 15: 46, in part. 1879. 



A perennial, with a woody cespitose caudex; stems 1-2 dm. high, angled, glabrous or 

 nearly so; leaves 6-10 cm. long, ascending; stipules deltoid, scarious, 3 mm. long, mostly con- 

 nate; leaflets 15-21, linear or oblong, 1-1.5 cm. long, 1-3 mm. wide, glabrous or slightly strigose 

 above, strigose beneath, obtuse to retuse; peduncles 1-2 dm. long, overtopping the leaves; 

 racemes 3-6 cm. long, in fruit up to 10 cm. long; bracts lance-subulate, 3-4 mm. long, black- 

 hairy; calyx black-hairy with ascending straight hairs, the tube 5-6 mm. long, 4 mm. broad, 

 the teeth lance-subulate, about 4 mm. long; corolla cream-colored or white; banner 17-20 

 mm. long, moderately arcuate; wings somewhat shorter, the blades broadly oblong; keel- 

 petals much shorter, the blades broadly lunate, rounded at the apex; pod obliquely ovoid, 1.5- 

 2 cm. long, 7-9 mm. thick, glabrous, reticulate, the sutures rather prominent. 



Type collected at Klickitat, Washington, April 26, 1882 (herb. Columbia University). 

 Distribution: Washington and Oregon. 



3. Cnemidophacos Knowlesianus Rydberg, sp. nov. 



A perennial, with a woody cespitose caudex; stem 1-2 dm. high, angled and somewhat 

 sulcate, sparingly pubescent; leaves 5-10 cm. long, erect; stipules deltoid, 3 mm. long, some- 

 what connate; leaflets 25-33, linear-oblong, 5-10 mm. long, 2-3 mm. wide, canescent on both 

 sides, obtuse; peduncles erect, 1.5-2 dm. long, black-hairy above; raceme in anthesis 3-5 cm. 

 long, in fruit 5-10 cm. long; bracts lance-subulate, 3-4 mm. long, black-hairy; calyx black- 

 hairy with loose hairs, the tube 5 mm. long, 3 mm. broad, the teeth subulate, 4 mm. long; co- 

 rolla apparently white, 18-19 mm. long; banner narrowly obovate, moderately arcuate; wings 

 nearly as long, the blades obliquely oblanceolate, with a large basal auricle; keel-petals shorter, 

 the blade broadly lunate, obtuse; pod erect, obliquely ovoid, short-pubescent, wrinkled, 

 1.5-2 cm. long, 7-8 mm. thick, upper suture prominent, transversely oval in cross-section. 



Type collected on mountain sides, western Klickitat County, Washington, April 23 and in June 

 18S6, Suksdorf 482 (herb. Columbia Univ.). 

 Distribution: Washington and Oregon. 



