54 



29a. Flowers purple Flowering Raspberry, Riibus odoratus. 



29b. Flowers white Salmonberry, Rubus paryiflorus. 



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, Primus serotina, 

 31b. Leaves obovate, the points of their teeth spreading 



Choke Cherry, Primus virginiaua. 

 32a. Flowers about 1 cm. wide 33. 

 32b. Flowers about 1.52.5 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, Primus mahaleb. 



35b. Leaves oblong-lanceolate, about 3 times as long as broad (shrub 

 or small tree, 210 m. high) Pin Cherry, Prunns Pennsylvania. 



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 thick- 

 ets) 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 mains. 



40a. Shrubs or small trees, without thorns 42. 

 40b. Bushy trees or shrubs, with thorns or stiff thorn-like 

 branches, and with flowers generally 1.5 2.5 cm. across 41. 



41a. Flowers pink, Very fragrant Wild Crab, Pyrus coronaria. 



41b. Flowers white (Hawthorn, the genus Crataegus). Several species 



of this genus occur in the state, for the identification of which 



the Manual must be used. 



