VI. PLANTS ■WRIGHTIAN^. 45 



A. (Phaca) triflorus. Phaca triflora, DC. Astrag. t. 1. ^ Prodr. 2. p. 273. 

 P. Candolliana, H. B. K. Nov. Gen. 8f Sp. 6. p. 495. t. 586. Sandy banks of the 

 Rio Grande below El Paso ; April, June. (1361.) (Chihuahua, &c., Gregg. Mex- 

 ico, Coulter.) — The specimens accord very well with the figures and description of 

 Humboldt's plant, from the volcano of JoruUo, which is in Mexico, not in Peru, as 

 is inadvertently stated by De Candolle. The name is scarcely allowable ; since the 

 peduncle is sometimes as much as 15-flowered. But there is a recent Astragalus 

 Candollianus. Phaca annua, Gej/er, apparently differs from this only in its in- 

 curved and sharp-pointed pods. Should they be joined, this later name might be 

 adopted. — There are two forms in the collection of 1852, one dwarf or early, with 

 narrow leaflets, the root plainly annual ; the other (also from near Lake Gusman) 

 larger and smoother, with obovate leaflets. 



A. (Phaca) tephrodes (sp. nov.): villoso-canescens ; caule brevi e radice bicnnil 

 stipulis triangulatis scariosis fere liberis ; foliolis 7-9-jugis oblongis seu ovalibus 

 supra nunc subglabratis ; pedunculo plurifloro foliis brevioribus ; floribus subsessili- 

 bus ; calycis tomentosi dentibus subulatis tubo campanulato dimidio brevioribus ; 

 " corolla purpurea" ; leguminibus oblongis acuto-apiculatis arcuatis turgidis cinereis 

 chartaceis, suturis haud introflexis extus prominulis. — Plains at the base of the 

 Organ Mountains, New Mexico ; April. — The single specimen gathered is not in 

 good condition, although it has both flowers and full-grown fruit. The stems are 

 only an inch long ; but they doubtless elongate later in the season ; they are clothed, 

 like the whole plant, Avith a cinereous rather hirsute-villous pubescence. Leaves 

 crowded ; the leaflets 4 or 5 lines long. Spike an inch long, rather dense. Flowers 

 4 or 5 lines in length : the corolla pale, but said to be purple in Mr. Wright's notes. 

 Legume half an inch long, not stipitate, the transverse section probably orbicular 

 or nearly so, and 2 lines broad in the living plant. 



OxYTROPis Lamberti, Piirsh, var. Grag, PL Wright, p. 53. Sides of ravines 

 between the Mimbres and the copper mines. New Mexico, Oct. ; in flower and fruit. 

 (1006.) — Specimens even larger than Wright's No. 180; the scapes sometimes a 

 foot high ; and the leaflets 3 or 4 lines wide. 



Ch.etocalyx WisLizENi (Grog, PL Wright, p. 51): adde char.: lomento monili- 

 formi, 3 - 4-articulato, articulis oblongis compressis faciebus trinervatis. — Open 

 prairies on branches of the San Pedro, east of Santa Cruz, Sonora, Sept. ; in fruit. 

 (1007.) — A few scattered and minute bristles may be seen on the fruiting calyx. 

 Legumes an inch to an inch and a half in length, subsessile in the calyx, more or 

 less contracted at the joints, which break apart at maturity ; the articles are 3 or 4, 

 oval or oblong, truncate at the ends, compressed, somewhat margined, one-seeded, 

 3-5 lines long, coriaceous, puberulent, their faces marked with three subparallel 

 nerves, and minutely reticulated between the nerves ; the terminal joint wholly, or 

 its sterile apex, somewhat foliaceous and dilated. The cells are lined with woolly 

 hairs. Seeds oblong, compressed. Radicle incurved. — The fruit of the original 

 species of Chstocalyx, DC. is still unknown. That of the present plant is truly 

 Hedysareous. It diflFers from the character of Rhadinocarpus, Vogel, (which Mr. 



PL. WR. — 7. 



