Loosely soft-pubescent or silky, decumbent or ascending 10—18 inches high. Leaves 4—6 inches long with 12—16 pairs of lanceolate to oblong, acute leaflets, ¼—½ an inch long. Flowers small, pale purple, little more than ¼ of an inch long in slender spikes 2—4 inches long on peduncles much surpassing the leaves. Calyx nearly as long as the corolla, with short black and longer white hairs; fruit strongly reflexed. In moist open ground throughout the eastern Rockies at the lower altitudes; flowering in July. [Illustration: Aragallus viscidulus Rydb. (⅓ Nat.) Sticky Oxytrope.] [Illustration: Aragallus deflexus (Pall.) Heller. (½ Nat.) Drooping Vetch.] [Sidenote: =Aragallus inflatus= (Hook) A. Nelson. _Inflated Oxytrope._] Acaulescent or more or less so, 1—4 inches high, soft-hairy. Leaves pinnate with 5—11 pairs of short linear-lanceolate or oblong leaflets. Flowers violet-purple, 1 or 2 on the peduncles which scarcely exceed the leaves; calyx densely dark-hairy; pods much inflated. On high alpine slopes and summits through the Rockies, not a common plant but probably more general than is now known; flowering in July. [Sidenote: =Hedysarum americanum= (Michx.) Britton. _Purple Hedysarum._] Stem erect or somewhat decumbent, smooth or nearly so, 6 inches to 2½ feet high, generally simple. Leaves 2—8 inches long with 11—21 oblong or oblanceolate-obtuse leaflets, ½ to nearly 1 inch long. Flowers violet-purple or nearly white, deflexed, ½—¾ of an inch long in rather loose elongated racemes; calyx teeth ovate-acute, shorter than the tube. One of the taller of the vetches growing in open stony places and slides throughout the Rockies at the lower altitudes, flowering in July. [Sidenote: =Hedysarum sulphurescens= Rydb. _Yellow Hedysarum._] Erect, 12—15 inches high, minutely hairy. Leaves with 5—6 pairs of oblong-elliptic, obtuse-cuspidate leaflets, ½—¾ of an inch long, finely hairy beneath. Flowers bright yellow, over ½ an inch long; 15—30 in a rather dense raceme; wings exceeding the vexillum but shorter than the keel. Throughout the Rockies in open woods and meadows up to 8000 feet elevation; flowering in June and July. [Sidenote: =Hedysarum Mackenzii= Richards. _Mackenzie’s Hedysarum._] Stems erect or decumbent, 12—18 inches high, usually minutely hairy. Leaves 3—6 inches long with 11—19 oblong-elliptic leaflets about ½ an inch long. Flowers ¾ of an inch long, reddish-purple, 20—30 in loose racemes on peduncles longer than the leaves; calyx teeth very slender, longer than the tube. On slides and in loose stony soil throughout the Rockies at varying altitudes; flowering during June and July. [Sidenote: =Vicia Cracca= L. _Cow Vetch._]