SYNOPSIS OF THE FLORA OF COLORADO. 25 



strict, erect, longer than the leaves, loosely many-flowered; bracts 

 scarious, subulate, longer than the pedicels; flowers yellow or ochroleu- 

 cous, re flexed; corolla rather large, 9" long; calyx gibbous at base, 

 pilose with blackish hairs, the subulate teeth scarce half as long as the 

 cylindrical tube; pod over I 7 in length, stipitate, exserted from the calyx, 

 pendulous, oblong, becoming arcuate with age, sharply 3-angled, cbart- 

 aceous, the dorsal suture salient, with an acute sulcus on each side, in- 

 truded half way to the ventral. This species must be referred to Sect. 

 11, Ga1egiforme8,of Gray's Revision, and seems in many respectsto fill an 

 intermediate position between A. Drummondii and A. racemoswi. South 

 Park, July 24, 1872, Porter. Wet Mountain Valley, 1873, Brandegee, in 

 flower and fruit. 



ASTRAGALUS RACEMOSUS, Pursh. Gr. Rev. 1. e., p. 200. Appressed- 

 pubescent or glabrate ; stem l-2 high, rather stout, somewhat silicate, 

 very leafy; stipules distinct, free; leaflets in about 10 pairs, elliptical- 

 oblong or oval, obtuse, mucronate, 6" -8" long; peduncles about the 

 length of the leaves, loosely many-flowered; flowers nodding and 

 somewhat secund; calyx strongly gibbous at base, whitish-puberuleut, 

 the setaceous teeth slightly shorter than the tube, equaling the stipe ; 

 pod lance-oblong, 1' long* three-angled, not 2-celled, cross section 

 somewhat equally tri-radiate, very smooth. Leaflets glabrous above. 

 Hall c(- Harbour i 113. Wet Mountain Valley, Braudegee. 



ASTRAGALUS GRACILIS, 2sutt. Gr. Rev. 1. c., p. 202. Erect, slender, 

 pubescent; stems virgate, 1 high or more from a very long, sweet 

 root; leaflets very narrowly linear, almost filiform, 7 // -10 // long, obtuse 

 orretuse, OtoSpairs: lower stipules somewhat united, the rest distinct: 

 raceme spike-like, many-flowered, long-peduncled. virgate ; flowers 3" 

 long, pale purple, recur ved-spreading; pods spreading, 2 // -3 // long, 

 coriaceous, strongly concave on the back, white hairy, at length glabrous, 

 transversely rugose-veined, elliptic-ovate, 1-celled, ventral suture thick 

 and subacute. Plains of Eastern Colorado, Dr. Bell. 



ASTRAGALI^ MiCROLOBUS, Gr. Rec. I. c., p. 203. (A gracilix, Ton*, 

 in Ann. X. Y. Lye., p. 179.) Cinereous-pubescent ; stems erect and 

 ascending, about 1 high ; leaflets linear or oblong-linear, emarginate, 

 4 // -6 // long; racemes rather short and usually loosely flowered; flowers 

 deep purple, 4" long ; pods re flexed, thick, cartilaginous, puberuleut, 

 finely rugulose, turgid, a little flattened on the back, the ventral suture 

 very thick. Hall & Harbour, 119; Brandegee. 



ASTRAGALUS ABORIGIXUM, Richards. Gr. Rer. 1. c., p. 208. Perennial 

 hoary-pubescent or subvillous ; steins numerous, rigid, ascending, J- 

 1 high ; stipules triangular, for the most part free ; leaflets 3-6 

 pairs, linear or oblong-lanceolate, acute ; peduncles exceeding the 

 leaves; flowers small (3 // -5 // long) in a compact raceme, white or 

 tinged with violet; calyx-teeth filiform-subulate, a little snorter than 

 the tube; legume loug-stipitate, reflexed, somewhat membranous, 

 glabrous, laterally subcompressed, (cross-section oval,) straight dorsally, 

 the ventral suture arcuate, 1-celled with a very narrow rudimentary 

 septum on the dorsal side, 10-15-ovuled. Xot seen by us, but re- 

 ported from the Rocky Mountains of Colorado by Watson in King's 

 Rep., vol. 5, p. 70. 



ASTRAGALUS IODASTHUS, Watson. Kin(f* Rep., v. 5. p. 70. Peren- 

 nial, canescent with an appressed hairy pubescence, or nearly glabrous: 

 stems decumbent, G'-IO' long; stipules ovate-lanceolate, free or some- 

 what adnate to the petiole; leaflets G-10 pairs. 2 // -5 // long, obovate or 

 orbicular, obtuse ; peduncles equaling or shorter than the leaves; spikes 



