146 LEGUMINOS.E. astragalus. 



flowered; calyx slightly pubescent, campanulate, its acuminate teeth 

 about equalling the tube; petals 8-10 lines long, yellowish or whitish; pod 

 deflexed, chartaceous, linear, more or less curved, compressed, 2-celled by 

 the intrusion of the dorsal suture, the ventral suture acute, 6-10 lines long 

 by % li ne broad, black when mature. In forests at Glendale, south- 

 western Oregon. 



A. malacus Gray Proc. Am. Acad, vii, 336. Villous-hirsute with long 

 spreading hairs : stems rather stout, from a perennial root : leaflets 11-17, 

 obovate, retuse, 4-8 lines long : peduncles exceeding the leaves, bearing a 

 rather loose spike of several to many flowers; calyx cylindrical, pubescent, 

 with dark-colored hairs, the slender teeth much shorter than the tube, but 

 little shorter than the corolla : pods pendulous or spreading, lunate-lanceo- 

 late, an inch long, 3-4 lines broad, densely long-hairy, turgid and sulcate 

 on the back, sharp-edged ventrally, many- seeded. On alkaline plains, 

 southeastern Oregon to Nevada and Colorado. 



A. arrectus Gray 1. c. viii, 280. Somewhat cinereous-pubescent or 

 nearly glabrous: stems 1-2 feet high from a perennial root, erect, sulcate, 

 simple or branched : stipules distinct, scarious; leaflets 19-25, ovate or 

 narrowly oblong, obtuse or retuse, 6-8 lines long: racemes on long pedun- 

 cles, loosely rather few-flowered; flowers ochroleucous, 7 lines long; calyx 

 tubular-campanulate, pubescent with black hairs, its teeth short and slen- 

 der: pods erect upon spreading or somewhat deflexed pedicels, coriaceous, 

 subglabrous, oblong, 8-12 lines long, nearly straight, cuspidate, abruptly 

 narrowed at base into a stipe as long as the calyx, with a deep dorsal sul- 

 cus and somewhat carinate ventral edge, 2-celled, many-seeded. Eastern 

 Washington to Idaho and Nevada. 



A. obscurus Watson Bot. King. 69. Somewhat canescent, with a 

 minute appressed pubescence : stems 6-12 inches high, numerous, slender, 

 ascending; from a perennial root : stipules small, triangular, somewhat ad- 

 nate to the petiole; leaflets 5-15, linear to oblong, 2-5 lines long, obtuse or 

 acute : peduncles exceeding the leaves : racemes 5-15-flowered, loose or 

 capitate, calyx pubescent with black hairs, the campanulate tube twice 

 longer than the acute teeth, petals 6 lines long, ochroleucous or tinged 

 with violet, the upper one orbicular, longer than the entire lateral ones 

 and arched keel; pods terete, with a narrow dorsal sulcus, sessile, charta- 

 ceous, erect, 10-15-ovuled. Eastern Oregon to Nevada. 



§ 7. Succumbentes Gray 1. c. vi, 200. Pod chartaceous- 

 coriaceous, sessile, strongly compressed, falcate upward, bicari- 

 nate and deeply sulcate on the back, the ventral suture promi- 

 nent and acute. 



A. succumbens Dougl. Hook. Fl. i, 151. Hirsute throughout: stems 

 numerous, from the crown of a perennial root, decumbent, branching, 8-15 

 inches long: stipules small, oblong, acuminate, free and distinct; leaflets 

 1 1-15, obovate to oblong, 6 lines long or less; peduncles stout, shorter than 

 the leaves; racemes short, dense, many-flowered; calyx cylindrical, loosely 

 hirsute, its triangular acuminate teeth shorter than the tube: petals 8-10 

 lines long, nearly equal : pods glabrous, linear-lanceolate, falcate, 2 inches 

 lone, erect on spreading pedicels, bicarinate and deeply sulcate on the 

 back, the ventral suture prominent, acute, strongly compressed, many- 

 ovnled. On roekv or sandy hillsides along the Columbia river above The 

 Dalles. 



£ s. G-alegifobmes Gray 1. c. Pod exsert-stipitate, pendent 

 coriaceous or cartilaginous-chartaceous, straight, narrow, more or 

 less triangular, very deeply sulcate dorsally, the suture intruded 

 to the middle or beyond. 



