160 Reventi-Arrectl. 



late, hyaline, as long as the pedicels. Peduncles barely as long 

 as leaves, sulcate and slender. Leaves many and narrow, about 

 1 dm. long. Leaflets nearly contiguous, flat, thin, 6-15 pairs, 

 cuneate at base, long-petiolulate, broadly to narrowly elliptical, 

 1-2 cm. long, rounded, sparsely and softly hairy. Stems very 

 slender, sulcate, with rather long internodes, weakly ascending, 

 2-3 ft. long, smooth. Pubescence fine, lax and soft, kinky, at- 

 tached by the enlarged base. Plants of moist and sweet forests 

 of the Siskiyou region of northern California and adjacent Ore- 

 gon. Middle Temperate life zone. Pruniformes. 



Pods plum-shaped, on a slender stipe. I2i accidens. 



115. Astragalus reventus Gray Proc. Am. Acad. 15 46 (1879) A. 

 reventus var. Canbyi Jones. Phaca reventa (Gray) Piper. Pods l.,j-:i 

 cm. long, oblong-ovate to lanceolate, about 5 cm. wide and 4 mm. high, 

 fleshy and with woody inner walls, the sutures very prominent and 

 raised, barely sulcate and with nearly round cross section and dors al 

 suture a mere ridge within, shortly acuminate into flattish beak 2-4 mm. 

 long. Flowers soon reflexed, white. Banner deeply notched, about 

 1.5 cm. long. Wings lanceolate, about 4 mm. longer than keel and ns 

 much shorter than banner or less, rounded. Keel straight, tip ab- 

 ruptly erect, triangular and acutish, 3 mm. high. Calyx tube convex 

 on the upper side, teeth usually filiform, from half to nearly as long 

 as tube. Pedicels shorter than bracts, stout, about 2 mm. long, erect. 

 Bracts lanceolate, hyaline. Peduncles coarse, nearly a foot long and 

 subscapose, floral spikes mostly short-oblong and many flowered. 

 Leaves 1-2 dm. long, with 10-20 pairs of elliptical leaflets hardly 2 cm. 

 long which are rounded, thin, and nearly smooth above, folded when 

 young and seemingly linear, ashy, short-cuneate at the long petiolu- 

 late base. Mature stems with 1-2 internodes 2-6 cm. long, from woody 

 root. Pubescence minute. Stony hills of the Blue Mountains Oregon lo 

 Yakima valley and the Palouse, Washington. Middle Temperate life 

 zone. 



Astragalus reventus var. conjunctus (Watson) Jones Cont. 10 61 

 (1902) A. conjunctus Watson Proc. Am. Acad. 18 371 (1882). A. 

 conjunctus var. Hoodianus (Howell) Jones, and var. oxtropidoides 

 Jones. Phaca conjuncta (Watson) Piper. This differs from the type 

 in having the flowers rather racemose, the calyx lobes rarely over 

 one third the tube, the pod being distinctly inflated and 2-3 cm. long, 

 with the dorsal suture a little intruded, and the walls coriaceous, and 

 in the linear leaflets. The var. Hoodianus is intermediate with a 

 cartilaginous pod and elliptical leaflets. All sorts of Intergrades oc- 

 cur. Throughout the Columbia Basin. Middle and upper part of lower 

 Temperate life zone in rocky open places. The flowers are often tinged 

 with purple. 



116. Astragalus adanus Nelson Bot. Gaz. 53 222 (1912). Pods nearly 

 oval, about 1 cm. long, 5-7 mm. wide and 3 mm. high, shallow-sulcate 

 ventrally, flattish dorsally and obcompressed, very abruptly acute 

 by a deltoid and flattish beak which is in line with the ventral suture 

 and is long-subulate pointed, pod thin-cartilaginous, the wall when 

 fresh about 1 mm. thick, finely cross-ribbed, the shape nearly that of 

 A. gracilis, dorsal suture merely raised within, a little inflated. Flowers 

 not known. Peduncles subterminal, shorter than the leaves. Leaves 

 1-2 dm. long, with 7-lB pairs of elliptical rounded leaflets hardly 1 cm. 

 long. Stems a foot or two high, with 3-4 internodes 5-7 cm. long. 

 Whole plant nearly smooth. Steep north hillsides at Boise Idaho, 

 McBride. On the edge of the Lower Temperate life zone. This was 

 described as a near relative of A. nudus but its affinities are all with 

 the Reventi. 



