188 
145 Astragalus platytropis Gray Proc. Am. Acad. 6 526 (1865). 
Pods dark-puberulent, sometimes smooth when ripe, mostly mottled, 
oval to oblong-oval, very thin and papery, a little obcompressed when 
fresh, rounded at both ends, shortly apiculate 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-purple, about 7-8 mm.long. Banner dirty-white 
and tinged with yellow, or varying to light-lead-purple, 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 round, 
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 horizontal 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 1 mm. shorter. 
Calyx 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. Bracts mostly longer than the pedicels, ovate to lz nceolate, 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 apiculate, Stipules ovate, acuminate, large. 
Stems almost none, densely small-tufted, from a thick, fleshy, very 
long root. Pubescence silvery-silky. This growsin gravel on dry 
and rocky ridges for the most part, from the Upper to the Middle 
Temperate life zone. Rare. Sonora Pass Cal., Brewer; Beaverhend 
Co. Mont, Tweedy; Aurum and Sprucemont Nevada and Mt. Ibapah 
Utah, Jones. 
146 Astragalus Cobrensis Gray Pl. Wr. 2 43 (1853). Pods oblong, 
1-1.5 dm. long, 4-7 mm. wide, about 2-3 mm. high, chartaceous, almost 
sessile, abruptly rounded at both ends, conspicuously obenmpressed, 
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. Flowers rather many, densely short-spicate but the fruit race- 
mose though the fruiting rachis is rarely 5 cm. long. Banner oval, 
abruptly arched at end òf 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. 10-15-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, flexuous, with internodes shorter than the leaves, 
several from a much branched and slender root. Pubescence minute 
and appressed. This species grows in sandy soil among junipers, Low- 
er Temperate life zone from the Catalina Mts. Arizona to the Cobres 
of New Mexico and southward to Couhuila. D 
. 147 Astragalus Guat ensis Hemsley Bot. Cent. Am. 1264 
(1880). Pods oblong, about 1,5 cm. long, 7 mm. wide, 4 mm. high, ob- 
compressed, deeply sulcate dorsally, nearly 2-celled, with septum in- 
truded about one half mm. wide as a thin edge, pod alittle 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 
: a ad calyx, finely cross-nerved, rather Mino rae DH : 
about 8 mm. long, oval, abruptly arched at end of calyx to 45 degrees, 
mm. longer than wings. Wings oblong, rather nar above, a 
