[Illustration: _a_ Hieracium umbellatum L. Narrow-Leaved Hawk-weed. _b_ Agoseris aurantiaca (Hook.) Greene. (⅔ Nat.)] [Sidenote: =Agoseris aurantiaca= (Hook.) Greene. _Orange-flowered Agoseris._] Nearly smooth, not glaucous. Leaves oblanceolate, obtuse, entire or with lanceolate lobes toward the base, narrowed into slender petioles, 4—8 inches long. Scapes longer than the leaves, smooth below, woolly at the top; involucre ½—¾ of an inch high, bracts lanceolate, more or less woolly, flowers orange or copper-coloured. In open ground and alpine meadows throughout the region; flowering in midsummer. [Sidenote: =Agoseris graciliens= (A. Gray) Greene. _Slender Agoseris._] Smooth, leaves lanceolate or linear-lanceolate entire, 6—8 inches long, acute. Scapes slender, 10—18 inches high, woolly at the summit; involucre ½—¾ of an inch long, bracts narrow, smooth with hairy-fringed margins; flowers deep orange. In grassy alpine meadows throughout the Rockies at the higher altitudes; flowering during July. [Sidenote: =Taraxacum Taraxacum= (L.) Karst. _Dandelion._] Root thick and deep. Leaves oblong to spatulate in outline, usually rough-hairy at least when young, acute or obtuse, pinnatifid, sinuate-dentate or rarely nearly entire, rather succulent, 3—10 inches long, ½—2½ inches wide, narrowed into petioles. Scapes erect, 2—18 inches high, head 1—2 inches broad, containing very numerous golden yellow flowers, inner bracts of the involucre, linear or linear-lanceolate, the outer similar, shorter, not glaucous, reflexed, acute; achenes greenish brown. In waste places and open ground throughout the region, along roadsides and near the railway; established as a weed; flowering in early summer. [Sidenote: =Taraxacum montanum= Nutt. _Mountain Dandelion._] Smooth; scapes and leaves from the crown of a thick, vertical root. Leaves spatulate, oblong, nearly entire or runcinately-toothed, obtuse, the teeth shallow and simple, 3—4 inches long, ½—¾ of an inch wide. Flowers bright orange or yellow on smooth scapes, 4—8 inches high; involucral bracts all appressed, in 2-series, the outer ovate to lanceolate, frequently reddish; inner ones narrowly lanceolate. Throughout the Rockies in the lower valleys and slopes; flowering in early June. [Sidenote: =Sonchus arvensis= L. _Milk Thistle._] Stems smooth, leafy below, branched and nearly naked above, 2—4 feet high. Lower and basal leaves runcinate-pinnatifid, often 12 inches long, spinulose dentate, narrowed into short petioles, the upper pinnatifid or entire, clasping. Flowers bright yellow, numerous in showy heads, 1—2 inches broad; involucre nearly an inch high. An introduced weed, occurring more or less frequently along the line of the railway throughout the region; a showy plant when in flower, during the early part of the day. [Sidenote: =Lactuca pulchella= (Pursh) DC. _Large-flowered Blue Lettuce._]