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 rotundifolia var. Bicknellii Eggl. Rhodora 10:
79. 1908. Crataegus Bicknellii Eggl. Bull. Torr. Club 38: 244. 1911.
A round-topped shrubby tree, not more than 10° high with numerous stout spines 1'-2 1/2' long. Leaves ovate or oblong-ovate, 1 1/2'-3' long, 1 1/4'-2 3/4' wide, acute at the apex, broadly cuneate or rounded at the base, sharply doubly serrate with acute lobes towards the apex, dark green and shining above, paler and glabrous beneath; corymbs glabrous; flowers 8" or 9" broad; stamens about 10; anthers light purple; styles and nutlets 4 or 5; calyx-lobes long-acuminate, laciniate; fruit globose, red, about 5" thick; calyx-lobes reflexed, persistent, conspicuously lobed; flesh soft at maturity.
Nantucket Island, Massachusetts. June; fruit ripe September.
C. Oakesiana Eggl. Torreya 7: 35. Feb. 1907.
A round-topped shrub or tree, sometimes 20o high. Spines numerous, 3/4'-1 1/2' long. Leaves ovate to broadly ovate, acute or acuminate at the apex, gradually or abruptly cuneate at the base, doubly serrate towards the apex, 1'-2 3/4' long, 1'-2 1/4' wide, slightly pubescent above, becoming glabrate, paler and glabrous beneath; corymbs slightly villous; flowers about 10" broad; calyx villous, its lobes glabrous outside; stamens about 20, anthers yellow; styles and nutlets 3-5; fruit pyriform-ellipsoid, slightly angular, yellowish-red, about 10" thick, calyx-lobes deciduous; flesh soft, mealy, light yellow.
Locally common along the Connecticut River in Essex Co., Vermont. May; fruit ripe August.
1798. Not Lam. Ency. 1: 84. 1783. Crataegus chrysocarpa Ashe, Bull. N. Car. Agri. Coll.
175: 110. 1900. C. sheridana A. Nelson, Bot. Gaz. 34: 370. 1902. C. Doddsii Ramaley, Bot. Gaz. 46: 5: 381. 1908.
A beautiful round-topped shrub, or a tree occasionally 250 high, with numerous spines, 1'-3' long. Leaves ovate-orbicular or obovate, 1 1/4'-2' long, 3/4'-2 1/4' wide, acute at the apex, broadly cuneate at base, doubly serrate with rather coarse teeth and with 3 or 4 pairs of acute lobes, subcoriaceous, dark yellow-green and shining above, slightly pubescent or glabrous; corymbs pubescent or glabrous; flowers 7" or 9" broad; stamens 5-10; styles and nutlets usually 3 or 4; calyx-lobes lanceolate, acuminate, usually entire but glandular-margined; fruit depressed-globose to short-ovoid, about 5" thick, red; flesh soft; calyx-lobes reflexed.
Nova Scotia and New Brunswick to Saskatchewan, south to North Carolina, Nebraska, and in the Rocky Mts. to New Mexico. May; fruit ripe August-September.