.=

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.

37a. Leaves with sharp teeth, frequently bristle-tipped; a native
species (tall shrub or small tree, frequently growing in thickets)
=Wild Plum, Prunus americana.=

37b. Leaves with obtuse teeth; a species escaped from cultivation
(widely branched tree) =Cherry, Prunus cerasus.=

38a. Trees, in cultivation or escaped from cultivation near roads
or dwellings, with showy flowers 2.5-5 cm. across, edible
fruits, and no thorns (spring) --39.

38b. Native species, trees or shrubs, growing in woods, fields, or
thickets; frequently with thorns (spring) --40.

39a. Leaves finely serrulate or entire =Pear, Pyrus communis.=

39b. Leaves coarsely serrate or somewhat lobed =Apple, Pyrus malus.=

40a. Shrubs or small trees, without thorns