460 NORTH AMERICAN FLORA [Volume 24 



long, emarginate; wings about S mm. long, the blade oblanceolate, with a large reflexed auricle; 

 keel-petals about as long, the blade strongly arcuate near the rounded apex, with a small 

 auricle; pod rounded-ovoid, strongly cross-ribbed, glabrous, 4 mm. long, nearly as thick and 

 wide, broadly obcordate in cross-section. 



Type locality: San Luis Obispo, California. 

 Distribution: Known only from the type locality. 



59. GEOPRUMNON Rydb.; Small, Fl. SE. U. S. 615, 1332. 1903. 



Low perennials, with cespitose rootstocks. Stems mostly decumbent or spreading. 

 Leaves odd-pinnate, with stipules but without stipels, the leaflets petioluled. Flowers in 

 axillary dense racemes. Calyx deeply campanulate, the tube longer than the 5 teeth. Corolla 

 purple or whitish. Banner oblanceolate or narrowly obovate, mostly retuse at the apex, 

 cuneate at the base, without a claw, moderately arched at the middle, with spreading margins. 

 Wings with an oblong blade, about equaling the claw, and a basal reflexed auricle. Keel- 

 petals shorter, the blade broadly lunate, obtuse at the apex. Stamens diadelphous (9 and 1), 

 the sheath almost straight. Ovary sessile, many-ovuled; style bent above, glabrous; stigma 

 capitate. Pod ellipsoid to subglobose, completely 2-celled by intrusion of the lower suture, 

 fleshy, becoming spongy in age, tardily dehiscent. Seeds round-reniform, oblique. 



Type species, Astragalus crassicarpus Nutt. 



Pod glabrous, at least in age. 



Pod subglobose or broadly ellipsoid, abruptly mucronate at the apex. 

 Calyx strigose. 



Pod subglobose. about as broad as long, 2-2.5 cm. long; corolla about 

 2 cm. long. 

 Corolla purple; leaflets oblong to linear. 1. G. crassicarpum. 



Corolla cream-colored with purple keel; leaflets oval or obovate. 2. G. succulentum. 

 Pod broadly ellipsoid, 2.5-3 em. long; corolla about 3 cm. long, 



white or ochroleucous. 3. G. mexicanum. 



Calyx densely woolly; corolla ochroleucous; pod subglobose. 4. G. trichocalyx. 



Pod obliquely ovoid, acuminate; corolla ochroleucous; leaflets lance-oblong. 5. G. pachycar putn . 

 Pod pubescent. 



Pod somewhat oblique but not curved, less than 2 cm. long, short-acumin- 

 ate; stems with short ascending hairs. 6. G. platlense. 

 Pod arcuate, more than 2 cm. long, gradually acuminate; stems with long 



spreading hairs. 7. G. tennesseense. 



1. Geoprumnon crassicarpum (Nutt.) Rydb.; Small, Fl. SE. U. S. 

 616, 1332. 1903. 



Astragalus crassicarpus Nutt.; Fraser, Cat. 1. 1813. 



Astragalus crassipes Fraser; Steud. Nom. Bot. ed. 2. 1: 160 (err.). 1841. 



Astragalus carnosus Pursh, Fl. Am. Sept. 740, in part. 1814; Nutt. Gen. 2: 100. 1818. 



Astragalus caryocarpus Ker, Bot. Reg. 2: 176. 1816. 



Tragacanlha caryocarpa Kuntze, Rev. Gen. 943. 1891. 



Phaca caryocarpa MacMill. Metasp. Minn. Valley 326. as synonym. 1892. 



Astragalus succulentus Lindl. Bot. Reg. 16: pi. 1324. 1830. Not A. succulenlus Richards. 1823. 



A perennial, with a cespitose rootstock; stems decumbent, at least below, 1-4 dm. long, 

 sparingly strigose, striate or slightly grooved; leaves spreading, 3-10 cm. long; stipules green 

 or partly hyaline, deltoid, acuminate, 5-7 mm. long; leaflets 15-21, linear to elliptic, cuneate at 

 the base, rounded to acutish at the apex, 5-18 mm. long, 3-7 mm. wide; peduncles 3-7 cm. 

 long; racemes dense, 3-4 cm. long; bracts lanceolate, acuminate, 3-5 mm. long, scarious; 

 pedicels very short; calyx more or less black-hairy, the tube S— 10 mm. long, 3 mm. wide; 

 corolla 2 cm. long, purple; banner oblanceolate, retuse; wings nearly as long, the blade oblong, 

 equaling the claw, with a small reflexed auricle; keel-petals much shorter, the blade broadly 

 lunate, shorter than the claw; pod glabrous, subglobose, about 2 cm. in diameter. 



Type locality: Above the river Platte, Nebraska. 



Distribution: Prairies and plains from Manitoba to Missouri, Tennessee, New Mexico, 

 Montana, and Saskatchewan. 



Illustrations: Bot. Reg. 2: pi. 176; 16: pi. 1324 (as A. succulenlus) ; M. E. Jones, Rev. Astrag- 

 al*. 60, f. 196; Fl. Neb. 2V.pl. 10, f. 52-54; Clements, Rocky Mt. Fl. pi. 29, f. 24; Britt. & Brown, 111. 

 Fl. /. 2125; ed. 2. /. 2530. 



