Carpels with solitary ovules; fruit an achene. Sepals valvate in the bud; leaves opposite. =Atragene.= Sepals folded on each other in the bud; leaves not opposite. Stem leaves three in a whorl. Styles short, smooth or hairy. =Anemone.= Styles long, plumose. =Pulsatilla.= Stem leaves alternate or basal. Petals none, flowers small; leaves compound. =Thalictrum.= Petals present. Flowers white. =Batrachium.= Flowers yellow. Achenes papillose or spiny. =Ranunculus.= Achenes longitudinally nerved. =Halerpestes.= Carpels with several ovules; fruit, follicles or berries. Flowers regular. Leaves simple. Petals none; leaves cordate-orbicular. =Caltha.= Petals linear-spatulate; leaves palmately parted. =Trollius.= Leaves compound. Sepals spurred; carpels becoming follicles. =Aquilegia.= Sepals not spurred; carpels becoming berries. =Actæa.= Flowers irregular; upper sepals spurred. =Delphinium.= [Sidenote: =Atragene columbiana= Nutt. _Purple Virgin’s-bower._] A climbing or trailing vine with somewhat woody stems. Leaves trifoliate, the leaflets thin, on slender petioles, ovate, attenuate, acute, and entire, 2—3 inches long. Flowers purple, 1½—2 inches broad, on long peduncles, solitary in the axils of the leaves; sepals 4—6, oblong-lanceolate, acuminate, more than twice the length of the stamens; styles persistent, forming a plumose head of fruit. In rocky woods and on shaded mountain sides up to 6000 feet elevation, throughout the Rockies, trailing over the ground, or festooning the shrubs or lower branches of the trees; flowering in early June. [Sidenote: =Anemone parviflora= Michx. _Northern Anemone._] Stem simple, sparingly hairy, 4—8 inches high. Basal leaves long-petioled, 3-parted, the broadly wedge-shaped divisions obtusely-lobed or crenate, those of the involucre nearly sessile, similarly lobed. Flower an inch or less in diameter, sepals, oblong, very obtuse, white, blue on the outside near the base; stamens numerous; head of fruit globose. Common throughout the Rockies in moist ground and rich woods; flowering early in June. [Illustration: _a_ Anemone Drummondii S. Wats. Alpine Anemone. _b_ Anemone parviflora Michx. Northern Anemone. (⅔ Nat.)] [Sidenote: =Anemone Drummondii= S. Wats. _Alpine Anemone._]