[Illustration: Amelanchier florida Lindl. (⅓ Nat.) Service-Berry.] [Sidenote: =Comarum palustre= (L.) _Marsh Cinquefoil._] Smooth, decumbent at the base, 6 inches to 2 feet long. Leaves pinnate, the lower long-petioled with 5—7 oblong or oblanceolate, sharply serrate leaflets, which are lighter-coloured and more or less hairy beneath; upper leaflets similar, 3—5. Flowers few, in an open cyme; calyx lobes purple within, acuminate, nearly ½ an inch long, enlarging in fruit; petals much shorter than the sepals. A marsh plant frequent throughout the region in very wet situations, at the lower altitudes; flowering in July. [Sidenote: =Argentina Anserina= (L.) Rydb. _Silver-weed._] Herbaceous, spreading by runners. Leaves all at the root, interruptedly pinnate with 7—21 leaflets and smaller ones interposed; oblong, sharply serrate, dark green above, soft, white-hairy beneath. Flowers bright yellow, ½—1 inch broad, solitary on long pedicels, petals exceeding the ovate, acute, calyx lobes. In open and waste ground and meadows throughout the Rockies at the lower altitudes; flowering during June and July. [Sidenote: =Potentilla nivea= L. _Snowy Cinquefoil._] Stem 4—8 inches high, woody at the base, with long silky hairs. Leaves 3-foliate, the lower petioled; leaflets oblong or obovate, usually deeply cut, densely, white-hairy beneath, green and loosely soft-hairy above, ¾—1 inch long. Flowers 1—5, bright yellow, ½—¾ of an inch broad; sepals silky, lanceolate, shorter than the broadly ovate, notched petals. Frequent throughout the Rockies in open, rocky situations; flowering during June and July. [Sidenote: =Potentilla dissecta= Pursh. _Cut-leaved Cinquefoil._] Stem decumbent or ascending 4—8 inches high from a woody base, more or less silky-villous or nearly smooth. Leaves pinnate or tripinnate with 5—7 lanceolate, deeply cut leaflets, usually glaucous and with ciliate edges. Flowers few, bright yellow, ½ an inch or more broad with notched petals, in an open cyme. In open alpine meadows and slopes throughout the region at the higher altitudes; flowering during June and July. [Sidenote: =Potentilla multisecta= (Wats.) Rydb.] Much like the preceding species but much more hairy throughout and with more divided leaves. Flowers in a loose cyme on scapes 4—6 inches high, not quite so large as in the preceding nor as brilliantly coloured. Dry rocky summits and ledges throughout the Rockies; flowering in June. [Sidenote: =Potentilla uniflora= (Ledeb.) _Alpine Cinquefoil._] Densely cæspitose from a woody base. Leaves closely tufted, small, palmately divided, leaflets deeply cut, densely white-woolly on both surfaces. Flowers solitary on short peduncles, bright yellow, half an inch or more broad; petals broadly obovate, notched at the apex, much longer than the densely soft-hairy lanceolate sepals. A high alpine species in dry stony ground throughout the Rockies, not common; flowering in July.