In moist places and along streams and river banks throughout the region; an attractive shrub, sometimes forming thickets of considerable size, the red stems contrasting beautifully with the dark green leaves; flowering in June. PYROLACEÆ _Wintergreen Family_ Low, mostly evergreen perennials with branched rootstocks and petioled leaves; flowers nearly regular, white or pink; calyx 4—5-lobed; corolla deeply 4—5-parted or of 5 petals; stamens twice as many as the divisions of the corolla, anthers opening by pores or short slits; stigma 5-lobed. Flowers racemose; leaves basal. =Pyrola.= Flowers solitary or corymbose; leaves opposite or whorled. Stem leafy at base; flower solitary; style long. =Moneses.= Stem horizontal; branches erect, leafy; style short. =Chimaphila.= [Sidenote: =Pyrola chlorantha= Sw. _Greenish-flowered Wintergreen._] Stems 4—10 inches high, 3—10 flowered. Leaves all basal, small, orbicular or broadly oval, mostly obtuse at both ends, sometimes narrowed at the base, thick, leathery, dull, obscurely crenulate or entire, ½—1 inch long, shorter than or equalling the petioles. Flowers greenish-white, nodding, slightly odorous, about half an inch broad; stamens and style declined, ascending; anther sacs short-beaked. On dry wooded slopes throughout the Rockies; flowering during June. [Sidenote: =Pyrola uliginosa= Torr. _Bog Wintergreen._] Scape 6—12 inches high, 7—15-flowered. Leaves broadly oval or orbicular, dull, rather thick, obscurely crenulate, obtuse at both ends. Flowers frequently over half an inch broad; calyx lobes oblong or ovate-lanceolate, ¼—⅓ the length of the petals; style and stamens declined; anther sacs beaked. In bogs throughout the Rockies, a very pretty species with bright rosy flowers and rounded leaves; flowering in July. [Sidenote: =Pyrola asarifolia= Michx. _Liver-leaf Wintergreen._] Stem 6—15 inches high, 7—15-flowered. Leaves reniform, usually wider than long, thick, shining above, obtuse at the apex, cordate at the base, crenulate, 1—1½ inches long, usually shorter than the narrowly margined petioles. Flowers ½—¾ of an inch broad, pink, nodding in a slender raceme 2—4 inches long; stamens and style declined, ascending; style exserted. In damp ground, in woods and swamps throughout the Rockies; flowering in July. [Illustration: _a_ Pyrola asarifolia Michx. Liver-Leaf Wintergreen. _b_ Pyrola uliginosa Torr. _c_ Moneses uniflora (L.) A. Gray. One-Flowered Wintergreen. (⅔ Nat.)] [Sidenote: =Pyrola minor= L. _Lesser Wintergreen._] Leaf blades thin, broadly oval or nearly orbicular, dark green, crenulate, obtuse but sometimes with a spine-tipped apex, rounded, slightly narrowed or subcordate at the base ½—1 inch long. Flowers pinkish, ¼ inch broad, nodding, in a close raceme; style straight included, stamens not inclined. In damp mossy places throughout the region at the higher altitudes; flowering in July.