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..
Crataegus collina Chapm. Fl. So. U. S. Ed. 2, suppl. 2.
684. 1892. C. Lettermani Sarg. Bot. Gaz. 31: 220. April 1901. C. sordida Sarg. Bot. Gaz. 33: 114. Feb. 1902.
A tree, sometimes 25o high, with spreading branches and a flat-topped crown. Spines numerous, 1'-2 1/2' long; leaves obovate or oblanceolate to oval, acute or obtuse at the apex, strongly cuneate, serrate or doubly serrate with obtuse lobes toward the apex, nearly entire below, 3/4'-2 1/4' long, 1/2'-2' wide, subcoriaceous, yellow-green, somewhat pubescent when young; corymbs and calyx pubescent; flowers 7"-12" broad; stamens 10-20 (commonly 20), the anthers usually yellow; styles and nutlets 4 or 5; calyx-lobes glandular-ciliate or glandular-serrate; fruit globose or compressed-globose, 5"-7" thick, red or orange-red; calyx-tube somewhat prominent, the lobes reflexed.
Virginia to Georgia, Missouri and Mississippi. April-May; fruit ripe October.
22: pl. 1912. 1836. Crataegus macracantha var. minor Lodd.; Loud. Arb.
Wash. 17: 175. 1904.
A small tree, sometimes 25o high, with ascending branches and a broad irregular crown. Spines numerous, 1 1/2'-4' long; leaves rhombic-ovate to obovate, 1 1/4'-3 1/4' long, \'-2\' wide, acute at the apex, broadly cuneate at the base, serrate or doubly serrate with fine teeth, often lobed towards the apex, coriaceous, dark shining green above, pubescent along the veins beneath; corymbs slightly villous; flowers about 10" broad; calyx-lobes lanceolate, acuminate, glandu-lar-laciniate, villous; stamens 10-20, usually 10. the anthers large, pink or occasionally yellow; styles and nutlets usually 2 or 3; fruit subglobose, 3"-8" thick, dark red, shining, villous; calyx-lobes reflexed; flesh thin, glutinous.
Crataegus neofluvialis Ashe, Journ. E. Mitch. Soc. 16:
71. Feb. 1900. Crataegus michiganensis Ashe, Bull. N. Car. Agric. Coll.
175: 111. Aug. 1900. C. gemmosa Sarg. Bot. Gaz. 33: 119. 1902. C. pisifera Sarg. Rhodora 7: 163. 1905.
A tree, sometimes 30° high, with ascending and spreading branches, and numerous spines 1' - 3 long. Leaves elliptic-ovate to obdvate, 1-3' long, 3/4'-2 1/2' wide, acute or obtuse at the apex, cuneate at base, sharply and doubly serrate with obtuse or acute lobes towards the apex, coriaceous, dark green and shining above, pubescent along the veins beneath; corymbs and calyx-tube glabrous or slightly villous; flowers 6"-8" broad, calyx-lobes more villous inside, glandular-laciniate; stamens 15-20; anthers usually pink, small; styles and nutlets usually 2 or 3; fruit globose or short-ellipsoid, dark red, 3"-6" thick, glabrous or slightly hairy; calyx-lobes reflexed; flesh thin, glutinous.
Western Vermont to eastern Wisconsin, North Carolina and Iowa. May; fruit ripe September.