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** Leaflets sessile.

6. Fraxinus angustifolia, Vahl. S. France, Spain, Portugal, N. Africa. See p. 879.

Leaflets seven to thirteen, lanceolate. Leaf-rachis strongly winged, the wings meeting above; groove interrupted.

7. Fraxinus Willdenowiana, Koehne. Origin unknown. See p. 884.

Leaflets, seven to eleven, ovate or lanceolate, increasing markedly in size from the base to the apex of the leaf. Leaf-rachis with a continuous open groove.

B. Branchlets glabrous ; leaflets pubescent on part of the lower surface.

* Leaf-rachis strongly winged on the upper side, the wings meeting
in part above, forming an interrupted open groove.
8 to 11. Leaf-rachis not conspicuously bearded at the nodes.

8. Fraxinus oxycarpa, Willdenow. Italy, S.E. Europe, Asia Minor, Caucasus. See p. 882.

Leaflets seven to thirteen, ovate or lanceolate ; serrations few, ending in long incurved points.

9. Fraxinus excelsior, Linneeus. Europe, Caucasus. See p. 864.

Leaflets, five to eleven, oblong-lanceolate; serrations crenate, numerous, exceeding in number the lateral nerves.

10. Fraxinus excelstor, Linnzus, var. rotundifolia. See p. 866.

Leaflets nine to thirteen, 14 to 24 inches long, ovate, oval, or orbicular, coarsely bi-serrate.

11. Fraxinus Elonza, Dippel.t Origin unknown. See p. 883.

Leaflets, eleven to thirteen, small, less than 24 inches long, irregularly serrate, oblong, lanceolate or oval; under surface with brown tomentum near the base.

12, 13. Leaf-rachis with conspicuous tufts of brownish-red tomentum
at the nodes.

12. Fraxinus nigra, Marshall. N. America. See p. 898.

Leaflets, seven to eleven, oblong-lanceolate, rounded or broadly cuneate at the base, sessile.

13. Fraxinus mandshurica, Ruprecht. Eastern Asia. See p. 893.

Leaflets seven to thirteen, oblong-lanceolate, gradually tapering at the base, sub-sessile.

** Leaf-rachis with a continuous open groove on its upper side, which
is sometimes almost obsolete.

† Some or all of the leaflets distinctly stalked.
14, 15. Leaflets white beneath.

14. Fraxinus americana, Linneus. N. America. See p. 901.

Leaflets seven to nine, 4 to 6 inches long, long-acuminate, dull light green above; rachis with an extremely slight groove.

1 The groove on the leaf-rachis is variable in this species, sometimes being open its whole length.