VOL. II.] 



PEA FAMILY. 



305 



2. Phaca neglecta T. & G. Cooper's Milk Vetch. (Fig. 2149.) 



Phaca neglecta T. & G. Fl. N. A. i: 344. . 1838. 

 Astragalus Cooperi A. Gray, Man. Ed. 2, 98. 1856. 



Glabrous or nearly so, erect, i-2 high. Stipules 

 ovate, acute, i // -2 // long; leaflets 9-21, thin, oblong or 

 elliptic, often minutely pubescent beneath, 8 // -i2 // long, 

 obtuse or emarginate at the apex, narrowed at the base; 

 peduncles shorter than or equalling the leaves; flowers 

 white, 5 // -? // long, in rather loose spikes; calyx pubes- 

 cent with blackish hairs, its teeth subulate; pod i-celled, 

 sessile, the ventral suture somewhat intruded, inflated, 

 coriaceous, ovoid, acute, glabrous, slightly furrowed along 

 both sutures, 6 // -io // long, 5 // -6 // thick. 



On banks and shores, Quebec to Niagara, west to Minnesota 

 and Iowa. June-July. 



3. Phaca longifdlia (Pursh) Nutt. Long- 

 leaved Milk Vetch. (Fig. 2150.) 



Psoralea longifolia Pursh, Fl. Am. Sept. 741. 1814. 

 Phaca longifolia Nutt.; T. & G. Fl. N. A. i: 346. 1838. 

 Astragalus pictus var. Jilifolius A. Gray, Proc. Am. Acad. 6: 



215. 1864. 



Erect, very slender, branching, finely canescent, 6 / -i8 / 

 high. Stipules subulate, rigid, those of the lower part of 

 the stem connate; leaflet usually i, narrowly linear, nearly 

 terete, \'-\' long, ^ // -i // wide, sometimes 3 or 5; flowers 

 few, pink, 3 // ~5 // long, in short loose racemes; peduncles 

 much shorter than the leaves; pod i-celled, short-stalked, 

 much-inflated, membranous, spotted, glabrous, ovoid, 

 short -pointed, not furrowed, about i' long, %' thick. 



In sandy soil, Nebraska to New Mexico. Leaves persistent. 

 May-June. 



25. HOMALOBUS' Nutt; T. & G. Fl. N. A. i: 352. 1838. 



Perennial herbs, with pinnate simple or pinnately 3-5-foliolate leaves, and racemose 

 mostly small flowers, the peduncles short, or elongated. Keel of the corolla obtuse. Pod 

 flat, glabrous or pubescent, completely i-celled, few-several-seeded, the sutures both promi- 

 nent externally. [Greek, regular-lobes.] 



Besides the following species, some 30 others occur in western North America. 



Plants leafy-stemmed. 



Leaves pinnate; leaflets 11-23, thin. i. H. tenellus. 



Leaves pinnate; leaflets 3-7, rigid, very narrow, spiny. 2. H. montanus. 



Plant scapose; leaves simple, or pinnately 3-5-foliolate, the leaflets very narrow. 3. H. caespitosus. 



i. Homalobus tenellus (Pursh) Britton. 

 Loose-flowered Milk Vetch. (Fig. 2151.) 



Astragalus tenellus Pursh, Fl. Am. Sept. 473. 1814. 

 Ervum multiflorum Pursh, Fl. Am. Sept. 739. 1814. 

 Homalobus multiflorus T. & G. Fl. N. A. i: 351. 1838. 

 A. mullijlorus A. Gray, Proc. Am. Acad. 6: 226. 1864. 



Ascending or diffuse, slender, branched, finely pubes- 

 cent, or glabrate, ic'-iS' high. Stipules broadly ovate, 

 I /^ // ~3 // l n g) acute or obtuse, the upper ones connate; 

 leaflets 11-23, thin, oblong, linear-oblong or oblanceo- 

 late, obtuse at the apex, narrowed at the base, 6 // -io // 

 long; flowers yellowish-white, 3 // ~4 // long, in loose 

 spike-like racemes; pod stalked, straight, oblong, acute 

 at each end, papery.'glabrous, 6 // -8 // long, 2" wide. 



Dry soil, Nebraska and Colorado to California, north to 

 the Northwest Territory and British Columbia. May-Aug. 



