21b. Calyx bristly-hispid =Red Raspberry, Rubus idaeus var. aculeatissimus.= 22a. Pedicels with gland-tipped hairs, but no prickles =Blackberry, Rubus allegheniensis.= 22b. Pedicels with prickles =Blackberry, Rubus nigricans.= 22c. Pedicels with neither prickles nor gland-tipped hairs --23. 23a. Leaves downy beneath =Blackberry, Rubus frondosus.= 23b. Leaves smooth beneath =Blackberry, Rubus canadensis.= 24a. Ovaries 1 or more, superior (attached to the surface of the receptacle, but not concealed within it or united to it) --25. 24b. Ovary 1, inferior (permanently enclosed within the receptacle, with only the styles protruding) --38. 25a. Ovaries more than 1 --26. 25b. Ovary 1 --30. 26a. Leaves serrate --27. 26b. Leaves lobed --28. 27a. Leaves glabrous or very nearly so (8-20 dm. high; flowers white or pinkish, summer) =Meadow-sweet, Spiraea salicifolia.= 27b. Leaves closely pubescent beneath (5-15 dm. high; flowers pink, summer) =Hardhack, Spiraea tomentosa.= 28a. Flowers showy, purple or white, 3-4 cm. broad --29. 28b. Flowers white, about 1 cm. wide (1-3 m. high; flowers in early summer) =Ninebark, Physocarpus opulifolius.= 29a. Flowers purple =Flowering Raspberry, Rubus odoratus.= 29b. Flowers white =Salmonberry, Rubus parviflorus.= 30a. Flowers in racemes (trees or tall shrubs; flowers white, in late spring) --31. 30b. Flowers in small umbels or corymbs (flowers white, in spring) --32. 31a. Leaves oblong, the points of their teeth incurved =Black Cherry, Prunus serotina.= 31b. Leaves obovate, the points of their teeth spreading =Choke Cherry, Prunus virginiana.= 32a. Flowers about 1 cm. wide --33. 32b. Flowers about 1.5-2.5 cm. wide --36. 33a. Low shrubs, with the spatulate or oblong leaves widest above the middle --34. 33b. Erect tall shrubs or small trees, with the leaves widest below the middle --35. 34a. An erect shrub (5-10 dm. high) =Appalachian Cherry, Prunus cuneata.= 34b. A prostrate or ascending shrub (3-15 dm. high) =Sand Cherry, Prunus pumila.= 35a. Leaves very broadly ovate, almost as wide as long (small tree) =Perfumed Cherry, Prunus mahaleb.= 35b. Leaves oblong-lanceolate, about 3 times as long as broad (shrub or small tree, 2-10 m. high) =Pin Cherry, Prunus pennsylvanica.= 36a. Sepals glandular-serrate (tall shrub or small tree) =Wild Plum, Prunus nigra.= 36b. Sepals entire --37.