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..
C. uniflora Muench. Hausv. 5: 147. 1770.
C. parvifolia Ait. Hort. Kew. 2: 169. 1789.
C. Smithii Sarg. Trees & Shrubs 2: 67. 1903.
A small irregular shrub, 3°-8° high. Spines numerous, slender, straight, often leaf-bearing, 1/2'-2 1/2' long; leaves obovate to spatulate, 1/2'-1 1/2' long, 1/4'-1 1/4' wide, obtuse or rounded at the apex, cuneate at base, crenate or crenate-serrate, subcoriaceous, shining above, very pubescent, becoming scabrate; petioles about I long, pubescent, winged; corymbs tomentose, 1-3-flowered, flowers 6"-8" wide; calyx-lobes foliaceous, slightly pubescent, lacini-ate; stamens about 20; anthers white; styles and nutlets 5-7; fruit ellipsoid, pyriform or globose, greenish-yellow or red, 5"-8" thick, pubescent; calyx-tube prominent, its lobes reflexed; flesh firm.
Crataegus punctata Jacq. var. ? brevispina Dougl.;
A tree or shrub, sometimes 40° high; bark dark brown and scaly. Spines 1/4'-l' long; twigs reddish; leaves ovate to obovate, 1/2'-2 3/4' long, 1/4'-2 1/4' wide, acute or obtuse at the apex, cuneate at the base, doubly serrate and lobed except near the base, dark green and appressed-pubes-cent above, glabrous beneath, subcoriaceous; petioles slightly winged, 1 1/4'-1' long; corymbs many-flowered, glabrous or nearly so; flowers about 8" broad, calyx-lobes acute or acuminate, entire, villous above, tinged with red; stamens 10-20; anthers light yellow; styles and nutlets 3-5; fruit short-ellipsoid, 4" or 5" thick, dark purple, becoming black in drying; flesh soft, sweet; nutlets ear-shaped, roughly pitted on the inner face.
Thunder Bay Island. Lake Huron and Keweenaw Peninsula, Mich.; Michipico'en Island, Lake Superior; and far northwestward. May, June; fruit ripe August-September.
Mespilus Phaenopyrum L. f. Suppl. 254. 1781.
Crataegus cordata Ait. Hort. Kew. 2: 168. 1789.
Not Mespilus cordata Mill.
C. Phaenopyrum Medic. Gesch. Bot. 83. 1793.
A shrub or small tree, 15°-30° high, with trunk diameter up to 1°. Branches strongly ascending; thorns numerous, ¥-2' long; leaves ovate-triangular, simply or doubly serrate, often 3-5-lobed, acute at the apex, rounded to cordate at the base, 3/4' - 3' long and wide, bright green above, glabrous; petioles 1/2-2' long, slender; corymbs many-flowered, glabrous; flowers 4"-6" wide; calyx-lobes deltoid, entire; stamens about 20; anthers pink; styles and nutlets usually 5; fruit depressed-globose, 2" or 3" thick, scarlet; calyx-lobes deciduous; nutlets with bare apex and smooth back.
Moist, rich ground, Virginia to Georgia, Illinois and Arkansas. Naturalized northward to Pennsylvania and New Jersey. Virginia, -hedge or -heart-leaved thorn. Red-haw. April-June; fruit ripe October-November.