This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Pyrus coronaria L. Sp. Pl. 480. 1753. Malus coronaria Mill. Gard. Dict. Ed. 8, no. 2. 1768. Pyrus angustifolia Ait. Hort. Kew. 2: 176. 1789. Malus angustifolia Michx. Fl. Bor. Am. 1: 292. 1803. Malus lancifolia Rehder, Trees & Shrubs 2: 141. 1911.
A small tree, sometimes 200 high and the trunk 10' in diameter. Leaves oblong, oblong-lanceolate or oval, thick, shining and dark green above, glabrous when mature, sometimes pubescent beneath when young, dentate or often entire, or those of sterile shoots often lobed, obtusish or acute at the apex, narrowed at the base, 1'-2' long; cymes few-flowered; pedicels 1'-1 1/2' long, slender; flowers pink, fragrant, mostly less than 1' broad; styles nearly separate; calyx-lobes early deciduous; pome about 1' in diameter, yellowish, hard.
In thickets, New Jersey to Illinois and Missouri, south to Florida and Louisiana. Recorded from Kansas. Wood hard, reddish brown; weight per cubic foot 43 lbs. Crab-apple or -tree. . Wild crab. Southern wild crab. March-May.
Pyrus baccata L. Mant. 1: 75. 1767.
Malus baccata Borck. Handb. Forstbot. 2: 1280. 1800-1803.
A small tree, up to 300 high. Leaves glabrous, ovate to ovate-oblong, 2'-4' long, acuminate at the apex, rounded or narrowed at the base, serrate, rather firm in texture; flowers clustered, on slender pedicels, about 1 1/2' broad; petals oblong to obovate, narrowed at the base; fruit globose, about 1' in diameter, yellow or reddish; calyx-lobes glabrous or nearly so, deciduous.
Escaped from cultivation and spontaneous, Maine to Connecticut. Native of Europe and Asia. May.
Malus glaucescens Rehder, Trees and Shrubs 2: 139. 1911.
A small tree, sometimes reaching a height of 25° and trunk diameter of 12'. Leaves petioled, ovate to triangular-ovate, sparingly pubescent beneath along the veins when young, glabrous when old, sharply serrate and on sterile shoots, often somewhat lobed, obtuse, acute or acutish at the apex, rounded or cordate at the base, 1'-3' long; flowers rose-colored, very fragrant, 1'-2' broad; pedicels 6"-18" long; calyx glabrous or pubescent, its lobes somewhat persistent on the pome; pome fleshy, globose or depressed, 1'-1 1/2' in diameter, greenish-yellow, fragrant, very acid.
In thickets, Ontario to Michigan, south to New Jersey, South Carolina, Iowa and Missouri. Wood soft, reddish brown; weight per cubic foot 44 lbs. Wild or fragrant crab. Sweet-scented crab. April-May. Fruit ripe Sept. Long mistaken for M. coronaria. Consists of several races, or may include more than one species.