Herbs with perfect regular flowers; calyx free from the ovary, usually 5-parted; corolla 5-cleft; stamens as many as the corolla lobes and opposite to them; flowers purple, yellow or white. Lobes of the corolla erect or spreading. Leaves in a rosette at the base of the scape. Corolla tube longer than the calyx; flowers pink. =Primula.= Corolla tube shorter than the calyx; flowers white or yellow. =Androsace.= Leaves whorled at the top of the stem; flowers white. =Trientalis.= Lobes of the corolla reflexed. =Dodecatheon.= [Sidenote: =Primula americana= Rydb. _Bird’s-eye Primrose._] Leaves spatulate or oblong, obtuse at the apex, narrowed or somewhat wedge-shaped at the base, tapering into petioles, green, usually white-mealy beneath, at least when young; 1—4 inches long, the margins crenulate-dentate. Flowers umbellate 3—20, on scapes 4—18 inches high; corolla pink or lilac, usually with a yellowish eye, the tube slightly longer than the calyx, the lobes wedge-shaped, notched at the apex, ¼ of an inch or more long. In swamps and wet meadows in the lower valleys of the eastern slopes of the Rockies not penetrating far into the mountains; flowering in June. [Sidenote: =Primula Maccalliana= Wiegand. _Maccalla’s Primrose._] Similar to the preceding species but much smaller. Leaves spatulate or obovate, mostly quite broad; pale green above, more or less mealy beneath, denticulate or repand, obtuse at the apex, narrowed or cuneate at the base, petioled or sessile, ½—1½ inches long, forming a rosette at the base of the scape. Flowers ⅜ of an inch broad or less, umbellate, on a peduncle 1—6 inches high; pale pink or bluish with a conspicuous orange eye; the lobes obcordate; corolla tube yellow, slightly longer than the calyx. The commonest primrose of the region on wet banks and moist, sandy or gravelly places at the lower altitudes throughout the Rockies; flowering in June, also occurs sparingly in the Selkirks. [Sidenote: =Androsace carinata= Torr. _Sweet Flowered Androsace._] Proliferously branched at the base and cæspitose. Leaves folded over each other, forming rosettes at the bases of the many-flowered scapes; from lanceolate to oblong-spatulate or ovate, keeled, 1-nerved, ¼—½ an inch long, acute, fringed with hairs on the margins. Flowers ¼ of an inch or more broad, cream-coloured with a brilliant yellow eye; 4—10 in a close umbel, on slender hairy scapes 1—3 inches high; flowers delicately fragrant. Throughout the Rockies in open situations either dry or moist, and at low or high altitudes; flowering from early June to midsummer according to the altitude. [Illustration: Primula Maccalliana Wiegand. (⅔ Nat.) MacCalla’s Primrose.] [Illustration: Androsace carinata Torr. (⅔ Nat.) Sweet Androsace.]