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 --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. 42a. Mid-vein glandular above (shrubs 1-3 m. tall; flowers white or pink) (Chokeberry) --43. 42b. Mid-vein not glandular (shrubs or trees, 1-10 m. tall; flowers white) (Juneberry) --44. 43a. Leaves glabrous beneath =Chokeberry, Pyrus melanocarpa.= 43b. Leaves tomentose beneath =Chokeberry, Pyrus arbutifolia var. atropurpurea.= 44a. Petals 15-25 mm. long --45. 44b. Petals 5-12 mm. long --46. 45a. Mature leaves glabrous =Juneberry, Amelanchier canadensis.= 45b. Mature leaves pubescent beneath =Juneberry, Amelanchier canadensis var. botryapium.= 46a. Flowers in racemes --47. 46b. Flowers solitary, or in small clusters of 2-4 =Juneberry, Amelanchier oligocarpa.= 47a. Leaves coarsely dentate, with about 1 tooth for each lateral vein =Juneberry, Amelanchier spicata.= 47b. Leaves finely serrate, with about 2-3 teeth for each lateral vein =Juneberry, Amelanchier oblongifolia.= 48a. Flowers yellow --49. 48b. Flowers white, pink, purple, or rose, never yellow --63. 49a. Plant with basal trifoliate leaves, resembling strawberry (1-3 dm. high; late spring) =Barren Strawberry, Waldsteinia fragarioides.= 49b. Plants with leafy stems --50. 50a. Flowers solitary in the axils of foliage leaves, on long peduncles (trailing or creeping plants; flowers in late spring and summer) --51. 50b. Flowers in narrow terminal spike-like racemes (3-8 dm. high; summer) (Agrimony) --52. 50c. Flowers in irregular or spreading clusters --55.