iqi2] NELSON— IDAHO PLANTS 411 



Secured by Nelson and Macbride on the steep cobblestone bluffs of the 

 Snake River, at King Hill, Idaho, July 15, 191 1, no 1088. 



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Astragalus obfalcatus, n. sp. — The woody taproot vertical, 

 with an enlarged crown, or in older plants with closely branched 

 caudex, the branches with enlarged crowns: stems solitary or few 

 from the crown or crowns, stoutish, erect, coarsely striate, green 

 and glabrate or sparsely hirsute with white hairs, few-leaved, 1-3 

 dm. high: leaves crowded on the crowns, somewhat spreading 

 upon the nearly erect petioles (the dead petioles persisting), 

 canescent with straight stiffish widely spreading coarse hairs; 

 leaflets 7-13, from oblong (or spatulate) to elliptic or obovate, 

 10-20 mm. long; petioles 5-10 cm. long, those of the stem shorter: 

 peduncles axillary, few-flowered: calyx tube 5-7 mm. long, the 

 pubescence on it mostly finer and shorter, black in part, its linear 

 lobes nearly as long as its tube : bracts linear, rarely as long as the 

 calyx tube: pods widely divaricate, falcate upward, abruptly 

 long-cuspidate, canescent with coarse hairs, completely 2-celled 

 by the intrusion of the dorsal suture, the rounded back scarcely 

 sulcate, somewhat flattened laterally to the almost carinate ventral 

 edge, the stout stipe not as long as the calyx tube: seeds many. 



In habit this species suggests A. mollissimus Torr. The shape of the leaf- 

 lets and even the pubescence is somewhat similar, and the pod is 2-celled, but 

 there the similarity ends. There are a few other species in which the pods 

 are falcate upward, but A . obfalcatus approaches none of these as closely as it 

 does A . mollissimus. 



Secured by Macbride (no. 1023) in dry lava soil, on Reynolds Creek, in 

 Owyhee County, July 3, 191 1 (full fruit; flowers not seen), and by Nelson 

 and Macbride (no. 11 19), at King Hill, in loose lava cinders, July 15, 191 1. 



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Lathyrus Bradfieldianus, n. sp. — Glabrous, mostly less than 

 m. high, stems weakly erect, among undershrub which give par- 

 tial support, rather strongly striate but noticeably angled only 

 on the more or less branched upper portion: leaflets mostly 10, 

 subsessile, beautifully and rather strongly veined, bright green 

 above, scarcely paler beneath, from broadly elliptic and obtuse 

 (or even retuse) to narrowly ovate and acute, all subulate-tipped, 

 15-30 mm. long; tendrils well developed, somewhat branched; 

 rachis moderately stout, the petiolar part usually shorter than the 



