[Sidenote: =Geum macrophyllum= Willd. _Large-leaved Avens._] Stout, erect, stiff-hairy, 1—3 feet high. Leaves lyrate-pinnate with broad foliaceous stipules, basal leaves petioled, the terminal segment much the largest, reniform, dentate, 3—7-lobed; lateral leaflets 3—6 oval or obovate with smaller ones interspersed. Flowers several, short peduncled, borne in a terminal head; bright yellow, nearly ½ an inch broad; petals longer than the acuminate sepals; receptacle nearly smooth. In damp places and low grounds throughout the region, most abundant in the Selkirks; flowering in June. [Sidenote: =Geum strictum= Ait. _Yellow Avens._] Hairy, branched above, 2—4 feet high. Stipules broad, foliaceous; basal leaves lyrate-pinnate; leaflets 5—7, obovate, cuneate, dentate or lobed, the terminal one largest, broadly ovate or cuneate, stem leaves sessile or short-petioled with 3—5 ovate or oblong, acute segments. Flowers yellow, ½ an inch broad; receptacle downy. In swamps or low grounds throughout the region; flowering in June. [Illustration: _a_ Geum strictum Ait. Yellow Avens. _b_ Sieversia ciliata (Pursh) Don. Long-Plumed Purple Avens. (⅔ Nat.)] [Sidenote: =Sieversia ciliata= (Pursh.) Don. _Long-Plumed Purple Avens._] Soft-hairy, scapose; scape 4—18 inches high, simple, 3—8-flowered at the summit. Basal leaves petioled, interruptedly pinnate with many small leaflets, among the numerous obovate, deeply cut larger ones. Flowers ½ an inch broad of 5 pale purplish-pink petals hardly exceeding the calyx and spreading linear red bractlets; styles plumose in fruit, 1—2 inches long. In dry open grounds extending into the Rockies from the plains, where it is especially abundant, to the lower slopes and valleys throughout the region; flowering in June. [Sidenote: =Dryas octopetala= L. _White Mountain Avens._] Stems prostrate, branched, 3—6 inches long. Leaves oblong or ovate, ½—1 inch long, obtuse at each end, closely crenate, dark green and shining above, densely white-woolly beneath. Flowers solitary on slender pedicels, white, an inch or more broad; petals longer than the 6—8 spreading linear sepals; stamens numerous, anthers bright yellow; styles conspicuously plumose in fruit. Frequent in dry stony ground throughout the Rockies at elevations ranging from 4000 to 10,000 feet, forming dense mats of considerable size on the surface of the ground; flowering in June. [Sidenote: =Dryas Drummondii= Richards. _Drummond’s Mountain Avens._] Similar in manner of growth and general appearance to the preceding species. Leaves generally narrower at the base, the lobes dentate-crenate. Flowers ½ an inch long, campanulate, drooping on a densely woolly pedicel; sepals ovate, acute, black glandular-hairy; petals lanceolate, obtuse, bright yellow, about twice the length of the sepals; stamens included; styles numerous, conspicuously plumose in fruit.