193 
Stems sparingly branched and straggling upward, 1-2 ft. high. 
155 gracilentus. 
2A23. Pods cylindrical, acute, about 2 cm. long, little 
. oblique or much inflated, arcuate, sessile. 156 coriaceus. 
2A3B Pods not cylindrical. 
Pods straight, ovate, stipitate. 157 Antoninus, 
Pods oblanceolate. 158 pinonis. 
Pods immature and very hairy. 159 Neomexicanus. 
3A. Slender and prostrate plants with nearly simple stems 2-3 ft, 
long. Leaves distant, nearly sessile, divaricate. Peduncles long 
and divaricate. Flowers capitate. Pods rigid, 1-2.5 cm. long. 
160 Sileranus. 
152 Astragalus parviflorus (Pursh Fl. 474 as Dalea) MacMillan 
Metasperm. 325 (1892). A. microlobus Gray. Pods about oval, trian- 
zular-apiculate, about straight, 5 mm.long, by 3 mm. wide, barely 1 
im. high, in long racemes, reflexed, on pedicels about 1 mm. long. 
Flowers pale barely 4 mm. long, many. Banner oval, abruptly bent at 
end of tube to erect, 3-4 mm. long. with sides reflexed most above. 
wings oblanceolate, rounded, flaring, concave to keel and arched to 
45 degrees, longer than keel, but much shorter than banner. Keel 
a ched from base to a half circle and obtuse, barely 2 mm. long. All 
petals with exserted claws. Calyx hemispherieal, about 1 mm. long, 
with deltoid teeth less than a third as long as tube. Peduncles 1 ft. or 
so long, narrower than the stems, rather appressed as well as the 
leaves, with flowers racemosely spicate on the upper half and ap- 
pressed till nearly mature then flowers spreading to reflexed. Leaves 
rarely 7 cm. long, with 2-4 pairs of narrowly linear leaflets nearly 2.5 
em. long. Stems weakly erect, almost filiform, 1-2 ft. long, with ra- 
ther long internodes. Park Co. Montana to Kansas, Minnesota and 
Missouri on prairies and plains, in May and June. 
Astragalus parviflorus var. microlobus (Gray Proc. Am. Acad. 6 
203 1864 as species). This is a more robust and more branched form 
with pods often 8 mm. long, 3-5 mm. wide and 2 mm. high, and a little 
longer and narrower and somewhat arched and less obcompressed, 
the calyx tube is about 2 mm. long, the flowers 7-8 mm. long and the 
banner purple-striped. Leaflets 4-8 pairs, oblong to broadly linear or 
oblanceolate, rarely over 1 cm, long, mostly notched. Stems rather 
spreading or subdecumbent and widely branched. This is the com- 
mon form central Montana to southwestern Kansas and Colorado, in 
the foothills on the Atlantic slope in Colorado. 
253 Astragalus flexuosus Douglas in Hook. Fl. Bor. Am. 1 141 
(1830). Pöds 1-2.5 cm. long, short-stiiptate, rather rugulose, about 
smooth, in the type nearly round in cross-section or a little higher 
than wide, rather wider above, the ventral suture straight and not 
sulcate, the dorsal suture little or not at all sulcate, the triangular tip 
rarely 1 mm. long and is also straight and in line with the ventral su- 
ture. Flowers often purplish, in loose and rather short racemes. 
Banner oblong, abruptly arched beyoud calyx teeth to 45-90 degrees, 
not over 7mm. long. Wings nearly as long as banner, arched, nar- 
-owly oblong, obtuse. Keel about 2 mm. shorter than wings, 3 mm. 
long, 1 mm. wide, with straight base and then abruptly arched to erect 
at the obtuse tip which is purple and 2mm.high. Calyx tube about 3 
"m. long, triangular-campanulate, very oblique at tip, equally inserted, 
»=hy or nigrescent, teeth deltoid or triangular, rarely one fourth as 
long as tube. Pedicels 1-2 mm. long, rather longer than the ovate 
bracts. Peduncles 1-3 dm. long. (the rachis often as much more in 
íruit), longer than the leaves. slender, somewhat spreading, in all but 
