257 Hamosi. 



than the triangular bracts. Peduncles 5-7 cm. long, slender, rather 

 shorter than the leaves and rather longer than the rachis. Leaves 

 6-8 cm. long, narrow, somewhat tapering, longer than the internodes, 

 nearly sessile. Leaflets about 10 pairs, elliptical, obtuse, about 1 

 cm. long, rather ashy with v/avy and rather loose short and fine hairs, 

 young parts hoai^y. Stipules green, triangular, reflexed, hardly 5 

 mm. long. Stems about 2 ft. high, much branched, apparently from 

 a woody root, a little flexuous. Parras Coahuila, Nos. 1078 and 4672 

 Purpus. Tropical, blooming in spring and fall. Dr. Matthews's 

 specimens from Fort Wingate, New Mexico, in the Gray herbarium 

 in flovv^er only are much the same but with linear leaflets and longer 

 calyx tube and very long lanceolate bracts. Probably another species. 



218. Astragalus Arizonicus Gray Proc. Am. Acad. 7 398 

 (1868). Pods 2-4 cm. long, linear, a little arcuate, rather closely 

 appressed-erect, with spreading tips, occasionally slightly sulcate 

 dorsally but very narrowly so, both sutui-es rather prominent, much 

 laterally flattened, not densely pubescent, occasionally rather toru- 

 lose, with ventral suture forming a strong rib, raised, concave along 

 the middle, convex at both ends, and beak straight and arising from 

 a little above the middle of the end, and about 4 mm. long, the 

 pod abruptly contracted into it, cross-section narrowly triangular- 

 cordate. Flowers about 1 cm. long, many, in short racemes, dirty- 

 white and with purplish edges. Banner oval, arched to erect either 

 remotely from or at calyx tips, about 7 mm. long, with sides re- 

 flexed 2' mm. wide below, barely longer than keel. Wings not longer 

 than keel, narrowly oblong, 2 mm. wide, entire, rounded and very 

 oblique, purple below, whitish above, the tips incurved and hori- 

 zontal. Keel arched a little below, then abruptly erect and pro- 

 duced into a sharp tip 3-4 mm. high, large, dark-tipped, 5 mm. long. 

 Calyx tube campanulate, about 3 mm. long, acutish at base and 

 equally inserted, a little oblique at tip, cleft deeper above, with 

 rounded sinuses, closely appressed-nigrescent, a little obcompressed 

 above with fleshy base, on a short and stout pedicel about as long 

 as the ovate bract, teeth flaring, triangular, rather unequal, shorter 

 than the tube, or nearly as long. Peduncles stout, spreading, 1-2 

 dm. long. Leaves 7-10 cm. long, the upper nearly sessile, wide. 

 Leaflets 4-7 pairs, linear and acute to elliptical and rounded, the 

 narrower ones 2-3 cm. long, the wider ones about 7 mm. long, dis- 

 tant, rather long-petiolulate. Stipules small, triangular, brown, 

 about 3 mm. long. Stems more pubescent than the leaves, woody 

 at base, procumbent to prostrate, flexuous and often much so. 

 Pubescence hoary and a little loose. On the western and southern 

 flanks of the Mogollon plateau from the Chimihuevis Mts. to cen- 

 tral Mexico, Lower Temperate and upper part of the Tropical life 

 zones. Blooming in April and May. 



219. Astragalus calycosus Torrey Bot. King 66 t. 10 (1871). 

 A. brevicaulis Nelson. A. cyanoseminus Greene. " Hamosa Rydberg. 

 Pods 7-25 mm.' long, oblong to linear, abruptly acute and with a. 

 short apiculation to tapering and the beak 3 mm. long with beak in 

 line with the ventral suture, rather deeply and narrowly sulcate 

 dorsally, Avith cross section oblong-obovate-cordate, nearly straight 

 to decidedly arched, the ventral suture concave throughout, but 

 little raised and narrow. Flowers few, capitate, mostly 1 cm. long. 

 Banner abruptly arched at calyx tips to erect, white or purple, oval, 

 about 5 mm. long or less, deeply notched, with sides reflexed about 

 1 mm. wide, much longer than the keel and a little longer than 

 wings. White spot broad, cuneate, broadly notched, groove rectan- 

 gular and wider than high. Wings very closely appressed to keel 

 throughout, red-purple to keel tip and while beyond, deeply cleft 

 into 2 lobes, the lovver ones oblong, 2-4 mm. long, straight and like 

 normal wings, the upper one-third wider and erect, both lobes 

 rounded and narrow at tip (usually there is a fine thread almost as 

 long as the lobes coming out at their junction), 2-3 mm. longer than 



