188 



145 Astragalui platytropis Gray Proc. Am. Acad. 6 526 (1865). 

 Pods dark-puberulent. ^onletinlcs smooth when ripe, mostly mottled, 

 oval to oblong-oviil, very thin and papery, a little obcompressed when 

 fresh. rouHded at both ends, shortly apicuiate at tip, not oblique, with 

 dorsal suture the more arched, a little sulcate at both sutures, straight, 

 completely 2-celled by papery partition, with cross-section oval. Flow- 

 ers dull-white to lead-pur|)le. about 7-8 mm. long. Banner dirty-white 

 and tinged with yellow, or varying to light-lead-purjde, bent abruptly 

 at calyx tube to 45 degrees, concave, hooded at tip by the contraction 

 of the groove, about 7 mm. long, a trifle wider below but about rounil, 

 notched at midrib and often with additional ones at tip on each side; 

 groove very broadly V-shaped: sides reflexed a little, purple-veined 

 opposite the calyx mouth. Wings arched and exposing the whole 

 keel, obliquely lanceolate-oblong, obtuse, turned out and horizont.tl so 

 that they form with the keel the letter T. Keel broad, with straight 

 base and then abruptly erect and 3 mm. high, the tip truncate and 

 purple, about as long as banner and wings or about I mm. shorter. 

 Cab'x tube campanulate, about 2 mm. long, nigrescent, the teeth subu- 

 late and a little shorter than the tube. Pedicels very short to 2 mm. 

 long. P.racts mostly longer than the pedicels, ovate to Irn^eolate, mi- 

 nute. Peduncles scapose, filiform, 3-8 cm. long, capitately few-flow- 

 ered. Leaves 3-8 cm. long, narrow, much as in A. calycosus, the pet- 

 iole mostly longer than the rachis. Leaflets 3-6 pairs, 7-10 mm. long, 

 elliptical to obovate, acute to apicuiate. Stipules ovate, acuminate, large. 

 Stems almost none, densely' small-tufted, from a thick, fleshy xtry 

 long root. Pubescence silvery-silky. This grows in gravel on dry 

 and rocky ridges for the most part, from the Upper to the Middle 

 Temperate life zone. Rare. .Sonora Pass Cal., I'rewer; Bcaverhcid 

 Co. Mont, Tweedy; Aurum and Sprucemont Nevada and Mt. Ibapah 

 Utah, Jones. 



146 Astragalus Cobrensis Gray PI. Wr. 2 43 (1853). Pods oblong. 

 1-1.5 dm. long, 4-7 mm. wide, about 2-3 mm. high, chartaceous, ahnost 

 sessile, abrui-tly rounded at both ends, conspicuously obcomprcs.-ed, 

 convex to near the tip and concave at the tip, sulcate dorsally and the 

 ventral suture somewhat raised and rather thick, septum a little pro- 

 duced. I'lowers rather many, densely short-spicate but the fruit race- 

 mose though the fruiting rachis is rarely 5 cm. long. Lanner oval, 

 abruptly arched at end of calyx teeth to 45-90 degrees, 3-4 mm. long, 

 a little longer than wings, with sides reflexed about a half mm. wide. 

 Wings oblong-obovate, a little arched, 1-2 mm. wide, about 1 mm. lon- 

 ger than keel. Keel abruptly incurved to nearly a half circle, obtuse, 

 wide. Calyx not oblique, nigrescent, 1-2 mm. long, broadly campanu- 

 late, acute at base, equally inserted, the subulate and curved teeth ful- 

 ly as long as tube. Pedicels 1-2 mm. long, stout, about as long as the 

 rigid and triangular bracts. Peduncles hardly as long as the leaves, 

 rather stout. 10-l5-flowered. Leaves 4-10 cm. long,. Leaflets 6-10 

 pairs, 5-10 mm. long, nearly contiguous, about oval-obovate and most- 

 ly notched flat, about smooth. Stipules connate below. Stems hardly 

 a foot long, erect, fle.KUOus, with intcrnodes shorter than the leaves, 

 several from a much branched and slenrler root. Pubescence minute 

 and appressed. This species grows in sandy soil among juniper'^. Low- 

 er Temperate life zone from the Catalina Mts. Arizona to the Cobres 

 of New Mexico and southward to Coahuila. 



147 Astragalus Guatamalensis Hemsley Bot. Cent. Am. 1 264 

 (1880). Pods oblong, about 1,5 cm. long, 7 mm. wide, 4 mm. high, ob- 

 cop.ipressed, deeply sulcate dorsally, nearly ■2-celled, with septum in- 

 truded about one half mm. wide as a thin edge, pod a little concave in 

 middle along the ventral suture but convex at both ends with the short 

 apiculation in the middle of the end or a little below it and rather de- 

 clined, abruptly contracted at both ends, (in the type) on a stipe much 

 shorter than the calyx, finely cross-nerved, rather coriaceous. Banner 

 about 8 mm. long, oval, abruptly arched at end of calyx to 45 degrees. 

 2-3 mm. longer than wings. Wings oblong, rather narrowed above, a 



