Finely hairy or sometimes nearly smooth; stems tufted, slender, and weak, climbing or trailing 2—4 feet long. Leaves tendril-bearing 2—3 inches long of 18—24 thin, linear or linear-oblong, obtuse or acutish, mucronate leaflets, ⅓—¾ of an inch long. Flowers deep bluish-purple, ½ an inch long or less in dense spike-like racemes 1—4 inches long on peduncles equalling or exceeding the leaves. In dry or moist soil throughout the Rockies at the lower elevations, flowering during June and July. [Sidenote: =Vicia americana= Muhl. _American Vetch._] Smooth or some with appressed hairs, trailing or climbing 2—3 feet long. Leaves nearly sessile, 2—3 inches long, tendril-bearing, with 8—14 elliptic, ovate or oblong leaflets, ½—1½ inches long, obtuse or sometimes notched or mucronulate at the tip. Flowers bluish-purple about ¾ of an inch long, 3—9 in loose racemes, on peduncles usually shorter than the leaves. In moist ground at the lower altitudes throughout the Rockies, climbing over the surrounding shrubs and herbaceous plants; flowering in July. [Sidenote: =Vicia linearis= (Nutt.) Greene. _Narrow-leaved American Vetch._] Smooth or nearly so; stems weak, often zigzag, 1—2 feet long. Leaves tendril-bearing, with 4—7 pairs of narrowly linear or linear-oblong leaflets, 1—3 inches long, entire, acute and mucronate at the tip. Flowers purple or purplish, about ¾ of an inch long, 2—6 in loose racemes, on peduncles shorter than or about equalling the leaves. In dry soil at low altitudes throughout the Rockies especially near the line of the railway; flowering during July. [Illustration: Aragallus Lamberti (Pursh) Greene. (½ Nat.) Loco Weed.] [Illustration: Lathyrus ochroleucus Hook (½ Nat.) White Vetch.] [Sidenote: =Lathyrus palustris= L. _Marsh Vetchling._] Smooth or sparingly hairy, stems angled and winged, slender, 1—3 feet long; stipules half sagittate, lanceolate-linear or ovate-lanceolate, ½ to nearly an inch long. Leaves with branched tendrils and 2—4 pairs of lanceolate oblong or linear, acute, mucronate leaflets; 1½—4 inches long. Flowers purple, half an inch or more long, 2—6 in loose-headed racemes on peduncles about equaling the leaves. In wet ground and swamps at the lower altitudes throughout the region; flowering during July. [Sidenote: =Lathyrus ochroleucus= Hook. _Cream-coloured Vetchling._] Stems slender, somewhat angled, trailing or climbing, smooth and slightly glaucous, 2—2½ feet long, stipules broad foliaceous, half ovate and half cordate, ⅓—1 inch long. Leaves with branched tendrils and 3—5 pairs of thin, ovate or broadly oval, obtuse leaflets, 1—2 inches long, green above, whitish beneath. Flowers yellowish or creamy-white ½—¾ of an inch long, 5—10 on peduncles shorter than the leaves. On shaded river banks and hillsides at the lower altitudes throughout the Rockies; flowering during June. LINACEÆ _Flax Family_