VI. PLANT.E M-RIGHTIAN.E. 33 



P. AcuTiFOLius ; var. foliolis majoribus ovatis acutninatis ; legumiue majorc (3- 

 polUcavi). — Valleys of Sonora; Sept. (949.) 



P. ACUTIFOLIUS, var. TENuiroLius : gracilis ; foliolis lanceolatis e basi pi. m. dilatata 

 hinc interdum sublobata seu lineari-lanceolatis ; calycis labio siiperiore brcvi mu- 

 cronulato ; seminibus Isevibus nitidis. — Mountain-sides near the copper mines, New- 

 Mexico, and in Guadalupe Pass ; Oct. (950.) — Leaflets 2 or 3 inches long, most- 

 ly 2 or 3 lines wide at the base, thence tapering to an acute point. Cultivated 

 specimens, however, show broader leaflets, more or less dilated or obsoletely sub- 

 lobed, or gibbous at the base, and passing into the type of P. acutifolius. 



P. ANGUsTissiMUs (sp. nov.) : perennis, Isevigatus ; caulibus difl'usis sou volubili- 

 bus gracillimis ; stipulis ovatis minimis ; foliolis angustissime linearibus obtusius- 

 culis aveniis pedunculo paucifloro filiformi brevioribus ; calyce breviter campanulato, 

 labio superiore latissimo subemarginato dentibus inferioris ovatis obtusis a^quilongo ; 

 legumine oblongo falcato piano 3 - -l-spermo ; seminibus leviter rugulosis. — Stony 

 hill-sides, at the crossing of the Rio Grande above Doiia Ana, New Mexico, .July ; 

 and between San Pedro and Santa Cruz, Sonora, Sept. (951.) — Stems numerous, 

 from a firm perennial root, slender and very smooth. Leaflets 1-^- to 2 inches long, 

 a line or aline and a half wide, thickish, smooth, very minutely puberulcnt beneath 

 under a lens, longer than the petiole. Peduncle 2-5 inches long, loosely 2-5- 

 flowered. Pedicels longer than the calyx. Flowers 4 lines long; the ample vex- 

 illum and wings purple ; the spirally coiled keel yellow. Pod 8-10 lines long, 3 

 lines wide, narrowed towards the base, nearly glabrous ; the flat valves thin. 



P. Wrightii, Graij, PI. IVn't/ht. p. 43. Sides of stony hills, at the copper mines, 

 New Mexico ; Aug. (952.) — 'J'he specimens are much better than those of 1849, 

 and in fine flowering state. It is a perennial, with a lignescent fusiform root, of 

 a foot or so in length, and an inch in diameter. Stems either prostrate or twining. 

 The leaflets vary considerably in shape ; the lateral lobes sometimes little shorter 

 than the middle one, and in the larger leaflets themselves inclined to be two-lobed 

 at the apex. The racemes are rather many-flowered, with the bracts inclined to be 

 persistent. The young legumes are destitute of the conspicuous style which tips 

 those of the former, chiefly fruiting si)ecimens. The character of tlie species there- 

 fore needs some modification. 



P. MACROPOiDEs (sp. nov. § Microcochle) : radice tuberosa ; caulibus decumbenti- 

 bus retrorsum hirsutis ; stipulis ovatis acuminatis nervosis ; foliolis ovalibus vel 

 subrhombeis integris aut supra medium subunilobatis fol. infimum obtusis superi- 

 orum acutis pilis apprcssis utrinque hirto-pubescentibus ; pedunculis folio pluries 

 longioribus puberulis plurifloris ; calycibus subsessilibus villosulis, laciniis confor- 

 mibus lanceolato-subulatis ; alis corolke rotundatis vexillo duplo majoribus ; legu- 

 mine deflexo lineari-falcato puberulo subcompresso 4-r)-spermo. — Stony hills at 

 the copper mines, New Mexico ; Aug. (953.) — Stems beginning to flower when 

 only 2 inches long, extending a foot or two in length, decumbent or diffusely spread- 

 ing, flexuose, thickly villous-hirsute ; tlic pubescence of the petioles similar, but not 

 reversed. Stipules 2 or 3 lines long, rather scarious. Petioles 12-18 lines long. 

 Stipels subulate, longer than the petiolules. Leaflets 9-18 lines in length, mucro- 



