128 



F. excelsior monophylla. 



F. excelsior asplenifolia. 



F. excelsior nana. 



F. excelsior pendula. 



F. excelsior aurea pendula. 



F. excelsior aurea. 



F. excelsior. 



F. excelsior albo-variegata. 

 F. excelsior albo-marginata. 



3. Leaves of a single leaflet. 

 Leaves pinnate. 4. 



4. Leaflets deeply cut. 

 Leaflets not deeply cut. 5. 



5. Dwarf and shrubby. 

 Trees. 6. 



6. Weeping. 7. 

 Not weeping. 8. 



7. Twigs gray. 

 Twigs yellow. 



8. Twigs yellow. 

 Twigs gray. 9. 



9. Leaves green. 

 Leaves variegated. 10. 



10. Leaves with white center. 

 Leaves with white margin. 



11. Leaves whitened beneath: fruit rather stout, scarcely 



wing-margined: leaf-scars concave at top. 12. 

 Leaves merely lighter green beneath: fruit slender, 

 the narrow wing continuing to the base: scar- 

 margin not concave. 14. 



12. Glabrous. 13. 



More or less velvety. F. Biltmoreana. 



13. Leaves uniformly green above. (White ash). F. americana. 

 Leaves white-margined. F. americana albo-marginata. 



14. Glabrous or nearly so. (Green ash). F. lanceolata. 

 Twigs velvety. (Red ash). F. pennsylvanica. 



FONTANESIA. 



Deciduous shrubs with slender 4-winged twigs; round ho- 

 mogeneous pale pith; opposite or obliquely opposite raised 

 small crescent-shaped leaf -scars with 1 bundle-trace; no sti- 

 pule-scars; alternate round ovoid solitary sessile buds usually 

 with 2 or 3 pairs of exposed scales; simple glossy moderately 

 small short-stalked leaves; small whitish perfect flowers clus- 

 tered at the ends of the branches; and rather small winged 

 hard fruits. 



