[Sidenote: =Androsace septentrionalis= L. _Alpine Androsace._] Almost smooth, leaves lanceolate or oblong-lanceolate, narrowed at the base, from irregularly denticulate to laciniate-toothed. Flowers small, little more than ⅛ of an inch broad, white with yellow centre, in spreading umbels; peduncles 2—10 inches high. In open places and on grassy banks at the lower altitudes throughout the Rockies; flowering in May and early June. [Sidenote: =Androsace diffusa= Small. _Spreading Androsace._] More or less hairy. Leaves rosulate, oblanceolate to spatulate or nearly linear, ½—1½ inches long, obtuse or acute, sharply serrate above the middle or sparingly toothed. Scapes erect and spreading, often diffusely branched at the base, 2—4 inches long; pedicels thread-like from ½—3 inches long in the same umbel. Flowers white or pink, the corolla included or sometimes equalling the tips of the calyx segments. On grassy banks and slopes in the Rockies flowering in June. [Sidenote: =Trientalis arctica= Fisch. _Arctic Star-flower._] Stems slender, 1—4 inches high, with small scattered obovate leaves below; upper leaves obovate-lanceolate to lanceolate, obtuse, 1—1½ inches long. Flowers white on slender pedicels as long as the leaves; calyx reddish with 7 narrowly linear acute sepals; petals 7 white, lanceolate, acute, about twice the length of the sepals; stamens 7. In moist woods throughout the region, rare in the Rockies but common throughout the Selkirks; flowering in June. [Sidenote: =Dodecatheon pauciflorum= (Durand) Greene. _Slender Shooting Star._] Smooth. Leaves dark green, lanceolate, acute, entire, 2—3 inches long. Flowers few in an umbel; scape 6—8 inches tall; segments of the corolla rich lilac purple, the undivided part yellow with a narrow scalloped ring, midway between the base of the segments and the stamen tube; stamen tube often nearly as long as the anthers, yellow; anthers purple. In damp, open ground and grassy slopes throughout the eastern Rockies; flowering in June. [Illustration: Trientalis arctica Fisch. (⅔ Nat.) Arctic Star-Flower.] [Illustration: Dodecatheon conjugens Greene. (½ Nat.) Shooting-Star.] [Sidenote: =Dodecatheon conjugens= Greene. _Shooting-star._] Plant smooth. Leaves obovoid and elliptic, 2—5 inches long, including the distinct petiole, obtuse, entire. Flowers large, in a few-flowered umbel, scape 3—8 inches high; corolla deep purple varying to rose-red; anthers, distinct, obtuse, the connective lanceolate, acuminate to a linear point. In the open ground and plains in the lower Valleys of the Rockies; flowering in June. GENTIANACEÆ _Gentian Family_ Smooth herbs with opposite entire leaves, and regular perfect flowers in clusters or solitary at the ends of the stems or branches. Calyx 4—12-lobed; corolla 4—12-parted; stamens as many as the lobes of the corolla and alternate with them.