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..
Fraxinus americana L. Sp. Pl. 1057. I753.
A large forest tree, reaching a maximum height of about 130o and a trunk diameter of 6°. Twigs, petioles and rachis of the leaves glabrous; leaflets 5-9 (commonly 7), ovate, ovate-lanceolate, oblong or rarely slightly obo-vate, stalked, entire or denticulate, dark green above, pale or light green and often pubescent beneath, 3-5' long, 1'-2' wide, acuminate or acute at the apex, mostly rounded at the base; flowers dioecious (rarely monoecious), the calyx of the pistillate present and persistent; anthers linear-oblong; samara 1'-2' long, its body terete, not margined, winged only from near the summit, one-fourth to one-half the length of the linear-oblong or lanceolate wing. In rich woods, Nova Scotia to Ontario, Minnesota, Florida, Kansas and Texas. Wood heavy, hard, strong, brown; weight per cubic foot 41 lbs. April-Tune.
F. biltmoreana Beadle, Bot. Gaz. 25: 358. 1898.
Similar to Fraxinus americana, becoming at least 6o° high, but the young twigs, petioles and leaf-rachis densely pubescent or tomentose. Leaflets 7-9, stalked, ovate to oblong-lanceolate, entire-margined, or obscurely dentate, dark green and somewhat shining above, pale and more or less pubescent beneath; samara 1 1/2'-2' long, the narrow terminal wing 2-4 times as long as the oblong nearly terete plump body and but little decurrent upon it.
F. Darlingtonii Britton, Man. 725. 1901.
A tree, attaining a height of 700 or more, the twigs smooth or velvety, the twigs sometimes remaining velvety until the close of the growing season. Leaflets 5-7, ovate to oblong-ovate, usually denticulate, glabrous, or pubescent beneath, stalked, acute or acuminate, 3' long or less; samara narrowly linear, not spatulate, 2'-3' long, about 2" wide, the narrow wing decurrent on the slender, terete, seed-bearing part only to about its middle.
Hillsides, river-batiks and wet woods, Massachusetts to New York, Alabama and Louisiana. Wood hard, brown, strong. April-June.
Fraxinus Michauxii Britton, Man. Ed. 2, 1075. 1905. A tree, attaining a height of 40o or more, the hark rough and fissured, the young twigs glabrous or velvety. Leaflets 5-9, stalked, firm in texture, oblong-lanceolate, entire-margined, or slightly undulate, 4-5' long, 1'-2 1/2 wide, acute, dark green above, pale green, and more or less pubescent, at least on the veins beneath; flowers dioecious; samara broadly spatulate, 1 1/2"-2' long, 4"-5" wide, the thick blunt or notched wing as long as or longer than the linear, nearly round body and decurrent upon it to or about the middle.