This section is from the "The Fruit Manual; Containing The Descriptions and synonymes of the fruits and fruit trees commonly met with in the gardens & orchards of Great Britain, with selected lists of those most worthy of cultivation" book, by Robert Hogg. Also available from Amazon: The Fruit Manual
Branches rigid and spreading, forming round-headed trees. Leaves long, waved on the margin, thin and flaccid, and feebly supported on the footstalks. Flowers large, and opening loosely, with thin, flimsy, obovate, or roundish-ovate, petals. Fruit heart-shaped, or nearly so. Juice sweet.
§ Fruit obtuse heart-shaped. Flesh tender and melting. * Flesh dark; juice coloured.—Black-Geans.
Baumann's May Knight's Early Black
Black Eagle Luke Ward's
Early Purple Gean Osceola
Hogg's Black Gean Waterloo
Joc-o-sot Werder's Early Black
** Flesh pale; juice uncoloured.—Amber-Geans.
Amber Gean Hogg's Bed Gean
American Doctor Manning's Mottled
Belle d'Orleans Ohio Beauty
Delicate Sparhawk's Honey
Downer's Late Transparent Gean Early Amber
§§ Fruit heart-shaped. Flesh half-tender, firm, or crackling.
*Flesh dark; juice coloured.—Hearts.
Black Hawk Monstrous Heart
Black Heart Ox-Heart
Black Tartarian Pontiac
Buttner's Black Heart Tecumseh
Corone Tradescant's Heart Logan
** Flesh pale; juice uncoloured.—Bigarreaus.
Adams' Crown Florence
Belle Agathe Governor Wood
Bigarreau de Hildesheim Lady Southampton's
Bigarreau de Hollande Late Bigarreau
Bigarreau Napoleon Mammoth
Bowyer's Early Heart Mary
Buttner's Yellow Red Jacket
Cleveland Bigarreau Rockport Bigarreau
Downton Tardive de Mans
Gascoigne's Heart Tobacco-Leaved
Harrison's Heart White Heart
Early Prolific White Tartarian Elton