RypBERG: ASTRAGALUS AND ITS SEGREGATES 663 
10. Ctenophyllum Rydb. gen. nov. 
Stout perennials with often several stems rising from the same 
root and more or less stoloniferous. Leaves pinnate, with 11-19 
linear to filiform leaflets, which are very indistinctly jointed to the 
rachis ; stipules ovate, free from the petioles, but (especially the 
lower) united back of the stem. Peduncles usually equaling the 
leaves; raceme short. Calyx cylindro-campanulate, very gibbous 
at the base on the upper side. Corolla ochroleucous, with narrow 
petals ; keel almost straight. Pod oblong, terete, coriaceous with 
a subfleshy epicarp, in age cross-wrinkled, with thick and promi- 
nent sutures, neither of which is inflexed. 
Ctenophyllum pectinatum (Hook.) Rydb. 
Phaca pectinata Hook. Fl. Bor. Am. 1: 141. 1831. 
Astragalus pectinatus Dougl.; Hook. loc. cit, 142, as a synonym. 
11. Microphacos Rydb. gen. nov. 
Subcinereous perennials with very slender stems. Leaves 
pinnate with 11-17 linear to oblong leaflets ; stipules very broad, 
triangular, free from the petioles and only the lower more or less 
united with each other. Racemes many-flowered. Calyx short- 
campanulate, about 2 mm. long, with very short and broad teeth. 
Corolla purple, 5-6 mm. long, all petals strongly curved. Pod 
6-8 mm. long, coriaceous, cross-wrinkled, wholly 1-celled, 6—7- 
ovuled, boat-shaped, 7. ¢., lower suture prominent, strongly curved, 
upper suture nearly straight or curved upwards, flat or slightly 
sulcate. 
The first species is to be regarded as the type. 
Microphacos gracilis (Nutt.) Rydb. 
Astragalus gracilis Nutt. Gen. 2: 100. 1818. 
Microphacos microlobus (A. Gray) Rydb. 
Astragalus microlobus A. Gray, Proc. Am. Acad. 6: 203. 1863. 
12. Cnemidophacos Rydb. gen. nov. 
flowered. Calyx deeply campanulate; lobes linear-lanceolate, 
equaling the tube. Corolla yellow, with narrow petals. Pod 
coriaceous, oblong-ovoid, rounded below, somewhat depressed 
above, but with a very sharp suture and hence somewhat 2- 
grooved. 
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