New York Metropolitan Flora

Genus: Fraxinus

Fraxinus americana
Fraxinus americana   L.  -  White Ash
Photo © by Brooklyn Botanic Garden
Taken by G. A. Kalmbacher, 1966.

By Science Staff

Not peer reviewed

Last Modified 02/06/2013

Back to Oleaceae


Fraxinus L., Sp. Pl. 1057. 1753. Gen Pl., ed. 5, 477. 1754. LECTOTYPE: Fraxinus excelsior L. designated by Britton & Brown (1913)

Calycomelia Kostel., Allg. Med.-Pharm. Fl. 3: 1003. 1834. TYPE: Not designated.

Leptalix Raf., New Fl. 3: 93. 1838 (“1836”). TYPE: Not designated.

Aplilia Raf., New Fl. 3: 93. 1838 (“1836”). TYPE: Not designated.

Key to the species of Fraxinus

1. Leaflets sessile...2
1. Leaflets with a petiole...3

2. Rachis at base of leaflets with thick reddish tomentum; flowers dioecious...Fraxinus nigra
2. Rachis without conspicuous tomentum; flower polygamous...Fraxinus excelsior

3. Leaf scar upper margin sunken with bud down into scar...Fraxinus americana
3. Leaf scar upper margin straight, with bud above scar...4

4. Current year’s twigs glabrous or with white or gray tomentum...Fraxinus pennsylvanica
4. Current year’s twigs with brownish-yellow tomentum...Fraxinus profunda

List of Fraxinus Species

References to Fraxinus

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  • Green, D. S. 1980. The terminal velocity and dispersal of spinning samaras. Amer. J. Bot. 67: 1218-24.
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  • Greene, D. F.; Johnson, E. A. 1990. The dispersal of winged fruits and seeds differing in autorotative behavior. Canad. J. Bot. 68: 2693-7. (French summary)
  • Griffith, R. S. 1991. Fraxinus americana. ()
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