322 NORTH AMERICAN FLORA [Volume 24 



20. Balidophaca cretacea (Buckl.) Rydberg. 



Phaca cretacea Buckl. Proc. Acad. Phila. 1861: 452. 1861. 



Astragalus lotiflorus brachypus A. Gray, Proc. Am. Acad. 6: 209. 1864. 



Astragalus Reverchoni A. Gray, Proc. Am. Acad. 19: 74. 1883. 



Astragalus elatiocarpus Sheldon, Minn. Bot. Stud. 1: 20. 1894. 



Astragalus ammololus Greene, Erythea 3: 76. 1895. 



Astragalus lotiflorus elatiocarpus Rvdb. Mem. N. Y. Bot. Gard. 1: 254. 1900. 



Astragalus lotiflorus Reverchoni M. E. Jones, Contr. W. Bot. 10: 61. 1902. 



Phaca Rcverchonii Rydb.; Small, Fl. SE. U. S. 619, 1332. 1903. 



Phaca elaliocarpa Rydb. Bull. Torrey Club 32: 665. 1906. 



Astragalus Batesii A. Nelson, Bot. Gaz. 54: 150. 1912. 



Cystopora elaliocarpa Lunell, Am. Midi. Nat. 4: 428. 1916. 



A cespitose perennial, but blooming the first season, with a deep at first slender taproot, 

 and a short caudex; stems branched at the base, 2-10 cm. high, canescent; stipules deltoid, 

 pubescent; leaves 3-10 cm. long; leaflets oblong to oval, 5-20 mm. long, 2-6 mm. wide, silky- 

 strigose on both sides, less densely so or glabrate above; flowers of two kinds, the earlier in 

 short, long-peduncled racemes, sometimes not fruiting, the later, or in young plants all, sub- 

 sessile or short-peduncled in the axils, evidently fruit-producing without fully opening; pe- 

 duncles in the early flowers 4-15 cm. long; bracts subulate; racemes 4— 1 0-flowered ; calyx 

 silky-canescent, the tube 3 mm. long, the lobes subulate, 4 mm. long; corolla ochroleucous, 

 sometimes tinged or streaked with purplish, fully 1 cm. long; pod more or less lunate, 2.5-3 cm. 

 long, 7-8 mm. wide, silky-strigose; seeds obliquely round-reniform. The var. brachypus and 

 elatiocarpus represent the form with subsessile flowers. The species represents perhaps a 

 luxuriant form of B. lotiflora. 



Type locality: Northern Texas. 



Distribution: Minnesota to Texas, New Mexico, and Montana. 



Illustration: M. E. Jones, Rev. Astrag. pi. 28. 



21. Batidophaca nebraskensis (Bates) Rydberg. 



Astragalus lotiflorus nebraskensis Bates, Am. Nat. 29: 670. 1895. 

 Astragalus nebraskensis Bates, Torreya 5: 216. 1906. 



A perennial, with a deep root and cespitose caudex; stems branched at the base, less than 

 1 dm. high; stipules hirsute, deltoid, 4—5 mm. long; leaves 5-7 cm. long, erect; leaflets oblong 

 or elliptic, 1-2 cm. long, 4—6 mm. wide, hirsute on both sides; flowers 1-3 in the axils; peduncle 

 nearly obsolete (peduncled racemes like those of P. lotiflora and P. cretacea not seen); calyx 

 hirsute, the tube 3 mm. long, the lobes subulate, about 3 mm. long; corolla ochroleucous, like 

 that of P. lotiflora; pod lance-ovoid, about 2 cm. long and 8 mm. wide, densely hirsute. 



Type locality: Long Pine, Nebraska. 

 Distribution: Nebraska and South Dakota. 



44. PISOPHACA Rydberg, gen. nov. 



Perennial herbs, with slender stems, rootstocks, and cespitose caudices. Leaves odd-pin- 

 nate, with mostly oblong leaflets. Flowers perfect, borne in many-flowered racemes. Calyx- 

 tube campanulate, the teeth subulate. Corolla purple or white. Banner obovate, broad, 

 strongly arched. Wings slightly shorter, more or less falcate, with a reflexed basal auricle. 

 Keel-petals broader, more or less lunate, rounded or obtuse at the apex. Stamens diadelphous 

 (9 and 1), the sheath straight, the upper fourth of the filaments distinct, and upcurved; anthers 

 equal. Ovary sessile or nearly so; style slightly arched; stigma minute. Pod leathery, oblong 

 or linear to elliptic or obovoid, subsessile or short-stipitate, terete in cross-section, from very 

 slightly to considerably inflated, when very young filled within with spongy tissue, which in 

 age becomes fibrous; seeds obliquely reniform. 



Type species, Phaca fiexuosa Hook. 



Pod oblong or linear, slightly or not at all inflated. 



Corolla 6-10 mm. long. 1. Flexuosae. 



Corolla 12-15 mm. long. 2. Hallianae. 



Pod elliptic to oval or obovoid, distinctly inflated. 3. FamEHCAE. 



