Part 5, 1929] FABACEAE: GALEGEAE 309 



3. Pterophacos cinerascens Rydberg, sp. nov. 



A perennial; stems 1-2 dm. high, much branched, flexuose, strigose-canescent ; leaves 

 spreading, 3-5 cm. long, the rachis not margined, strigose; stipules deltoid, 2 mm. long; 

 leaflets 7-1 1, lanceolate, 5-8 mm. long, stiff, acute, strigose-canescent; peduncles 2-4 cm. long; 

 racemes 1-2 cm. long, few-flowered; bracts lanceolate, 1 mm. long; pedicels 2 mm. long; calyx 

 black-hairy, the tube 4 mm. long, the teeth deltoid, 1 mm. long; corolla purplish, about 14 mm. 

 long; banner obovate, moderately arched; wings 12 mm. long, the blade oblong, falcate; 

 keel-petals slightly shorter, the blade broadly lunate, almost semi-orbicular, rounded at the 

 apex; pod strigulose, strongly falcate, 4-winged, 1.5-2 cm. long, 5 mm. thick and 6 mm. wide. 



Tvpe collected on dry sandy bluffs southwest of Narrows, Harney County, Oregon, July 4, 

 1912, Morton E. Peck 3024 (Gray Herbarium). 



40. OROPHACA (T. & G.) Britton; Britt. & Brown, 111. Fl. 

 2:306. 1897. 



Phaca § Orophaca T. & G. Fl. N. Am. 1: 342. 1838. 



Densely cespitose, usually pulvinate perennials, with a woody caudex. Branches of the 

 stem usually very short, densely covered by stipules and old leaf-stalks. Leaves palmately 

 3-foliolate, the leaflets oblanceolate to cuneate, entire, silky-canescent. Flowers in small 

 axillary racemes. Calyx from turbinate-campanulate to cylindric, the teeth subulate, equaling 

 to much shorter than the tube. Corolla ochroleucous or purplish. Banner oblanceolate to 

 obovate, tapering into a broad claw. Wings shorter, the blade obliquely obovate, with a large 

 basal auricle, shorter than the claw. Keel-petals much shorter, the blade broadly lunate, 

 rounded at the apex. Pod ovoid or rounded ovoid, leathery, few-seeded, barely equaling the 

 calyx, indehiscent. 



Type species, Phaca cespitosa Nutt. 



Flowers 1 or 2, subsessile in the axils of the leaves, 12-20 mm. long; corolla 

 ochroleucous; calyx-tube cylindric, longer than the teeth; plant pulvinate. 

 Corolla about 2 cm. long or more, glabrous; calyx-tube at least 3 times as 



long as the teeth. 1. O. caespitosa. 



Corolla 15-18 mm. long, pubescent without; calyx-tube about twice as long 



as the teeth. 2. O. argophylla. 



Flowers in peduncled 1-3-flowered racemes; corolla purple, turning yellowish in 

 age, less than 1 cm. long. 

 Plant pulvinate; flowers 8-10 mm. long; racemes not exceeding the leaves. 



Flowers about 10 mm. long; pod puberulent. 3. O. tridactylica. 



Flowers about 8 mm. long; pod silky-hoary. 4. O. arelioides. 



Plant broadly cespitose, the branches prostrate; flowers about 6 mm. long; 



peduncles usually exceeding the leaves; pod hoary. 5. O. sericea. 



1. Orophaca caespitosa (Nutt.) Britton; Britt. & Brown, 111. Fl. 



2:306. 1897. 



Astragalus triphyllus Pursh, Fl. Am. Sept. 740. 1814. Not A . triphyllus Pall. 1800. 



Phaca caespitosa Nutt. Gen. 2: 98. 1818. 



Phaca triphylla Eaton & Wright, N. Am. Bot. 351. 1840. 



Tragacaniha triphylla Kuntze, Rev. Gen. 948. 1891. 



Astragalus gilviflorus Sheldon, Minn. Bot. Stud. 1: 21. 1894. 



A densely cespitose pulvinate perennial, with a branched woody caudex; branches 2-5 cm. 

 high, densely covered with stipules and old leaf-stalks; leaves clustered, 2-6 cm. long, erect; 

 stipules scarious, ovate or lanceolate, abruptly acuminate, 8-10 mm. long, sparingly hairy; 

 petioles 1-3 cm. long; leaflets usually 3, oblanceolate, acute, 1-2 cm. long, silvery-silky; 

 peduncles almost none; flowers 1 or 2, subsessile in the leaf-axils; calyx silvery-silky, the tube 

 cylindric, 10-15 mm. long, the teeth lance-subulate, 3 mm. long; corolla glabrous, ochroleucous, 

 with purple-tipped keel; banner narrowly obovate, refuse, slightly arcuate; wings shorter, the 

 blade obliquely obovate; keel-petals much shorter, the blade broadly lunate, rounded at the 

 apex; pod broadly ovoid, 7-10 mm. long, turgid, silky-villous. 



Type locality: "Confluence of Sawanee River with the Missouri " [South Dakota?). 

 Distribution: Saskatchewan to Nebraska, Wyoming and Montana. 



Illustrations: Hook. Fl. Bor. Am. pi. 55; Britt. & Brown, 111. Fl. f. 2154; ed. 2. f. 2555; M. E. 

 Jones, Rev. Astrag. pi. T.f. 24; Fl. Neb. 21: pi. 11, f. S8-91;- Am. Jour. Bot. IS: pi. 44 D. 



