Smooth throughout and somewhat glaucous; stem rather slender and leafy, 1—3 feet high. Leaves linear-lanceolate, lanceolate or oblong, acute, entire, dentate, lobed or pinnatifid, 2—8 inches long. Flowers bright blue or violet in numerous heads ½ an inch or more broad, in an open panicle. Frequent along the railway in moist open places throughout the region; flowering in midsummer. [Sidenote: =Crepis nana= Richards. _Alpine Hawk’s-beard._] Smooth, forming depressed tufts on slender, creeping rootstocks. Leaves chiefly at the root, 1—2 inches long including the petioles, obovate to spatulate, entire, repand dentate or lyrate, commonly equalling the clustered stems. Heads few-flowered, nearly ½ an inch high, narrowly cylindric, ⅛ of an inch in diameter; flowers bright yellow, spreading ¼ of an inch across. A small alpine plant growing among loose stones and on the moraines and on slides and summits throughout the Rockies; flowering in midsummer. [Sidenote: =Crepis elegans= Hook. _Many-flowered Hawk’s-beard._] Smooth, many-stemmed from a perennial tap-root, 6—12 inches high, diffusely branched. Leaves entire or nearly so; root leaves spatulate; stem-leaves from lanceolate to linear. Heads numerous, narrowly cylindric, ¼—⅓ of an inch high, the pale yellow flowers little more than ⅓ of an inch across. In gravel beds along the rivers and larger streams throughout the Rockies; flowering during July. [Sidenote: =Hieracium umbellatum= L. _Narrow-leaved Hawk-weed._] Stem rather slender, smooth or puberulent, sometimes rough hairy below, leafy, simple, 1—2½ feet high. Leaves lanceolate or the lowest spatulate, entire, denticulate or sometimes laciniate-dentate, acute or acuminate, 1—3 inches long, smooth above, usually hairy beneath with the margins fringed with hairs. Heads of flowers nearly an inch broad, umbellate, bright yellow. On banks and near rivers in the Rockies; flowering in July. [Sidenote: =Hieracium Scouleri= Hook. _Hairy Hawk-weed._] Hairy throughout with long, soft hairs; 1—2 feet high. Leaves lanceolate or spatulate-lanceolate, 3—6 inches long. Flowers in an irregular branching panicle. Head ½ an inch high; involucre with copious long bristly hairs; flowers bright yellow, ½ an inch or more broad. On banks and stony open ground throughout the region flowering during July. [Sidenote: =Hieracium gracile= Hook. _Slender Hawk-weed._] Growing in tufts, pale green. Leaves nearly all in clusters at the root, obovate to oblong-spatulate, 1—3 inches long, attenuate into petioles, entire or repand denticulate. Stems 8—18 inches high, brownish-hairy above, bearing few or several heads of flowers near the top; involucres about ⅓ of an inch high, usually blackish-hairy at the base; flowers bright yellow in heads ¼ of an inch or less broad. In dry open or shaded places at the higher elevations throughout the region, growing in sand; flowering in July. [Sidenote: =Hieracium albiflorum= Hook. _White-flowered Hawk-weed._]