[Illustration: Erythronium grandiflorum Pursh. (½ Nat.) Snow Lily.] This beautiful lily is frequent on the slides and mountain slopes throughout the region at an elevation of 5000 feet or higher, appearing immediately after the snows have melted, and lasting but a short time. It may be found flowering according to the elevation and condition of the snow, from May throughout the summer. The plant has derived its common name no doubt from its habit of blooming so close to the melting snows. Where the plant occurs it is usually found in great numbers during the brief flowering period. CONVALLARIACEÆ _Lily-of-the-Valley Family_ Resembling the lilies, sometimes with naked but usually leafy stems, and simple or branched, frequently creeping rootstocks, flowers usually small and variously disposed on the stem, either scattered in the axils of the leaves or in terminal clusters, or occasionally solitary on a naked stem; either 4- or 6-parted, regular, perfect; stamens 6. Plant producing but one flower. =Clintonia.= Plant producing several flowers. Flowers in a raceme or panicle. =Vagnera.= Flowers in an umbel or solitary. Flowers terminal on the branches. =Disporum.= Flowers axillary. Perianth narrowly campanulate. =Streptopus.= Perianth rotate. =Kruhsea.= [Sidenote: =Clintonia uniflora= (Schult.) Kunth. _Clintonia._] More or less hairy throughout, with 1 to 3 or 4 dark green leaves, 4—8 inches long and 1—2 inches wide, oblong-lanceolate with an abrupt tip, and tapering at the base to sheathing petioles, from a creeping underground stem 2—3 inches long. Flower-stem shorter than the leaves with one or rarely two blossoms which are pure white, very open, 6-parted; sepals and petals ¾—1 inch long, oblanceolate, obtuse; stamens 6, shorter than the petals, anthers yellow. In rich, moist woods throughout the region. [Illustration: Lilium montanum A. Nelson. (½ Nat.) Red Mountain-Lily.] [Illustration: Kruhsea streptopoides (Ledeb.) Kearney. (½ Nat.) Kruhsea.] [Sidenote: =Vagnera stellata= (L.) Morong. _Star-flowered Solomon’s Seal._] Glaucous throughout, 8—20 inches high, smooth or with a few short hairs, leafy from a stout fleshy root; leaves alternate, 2—5 inches long, lanceolate or oblong-lanceolate, acuminate, with a clasping base, smooth and bright green above, glaucous and minutely hairy beneath. Flowers white, several forming a rather open terminal head. 1—2 inches long; petals and sepals narrow, ¼ to ⅜ of an inch long; stamens 6, about half their length, anthers nearly white. Common throughout the region in moist words and thickets; flowering through June and July. [Sidenote: =Vagnera amplexicaulis= (Nutt.) Greene. _False Solomon’s Seal._]