1 86 The Ohio Naturalist. [Vol. XIII, No. 8, 



Synopsis. 



I. Flowers bisporangiate, imperfectly bisoprangiate, or imperfectly 

 monosporangiate; calyx none or very minute. 



1. Flowers bisporangiate; twigs 4-sided, sometimes sharply four- 



angled; wing of fruit extending around the body; leaflets green 

 on both sides, not entirely sessile; calyx a minute ring. 



F. quadrangtdata. 



2. Flowers imperfectly bisporangiate or imperfectly monosporangi- 



ate; twigs terete or nearly so; leaflets sessile; calyx none. 



(1) Leaflets oblong-lanceolate tapering to a long point. F. nigra. 



(2) Leaflets oblong to ovate-lanceolate, short pointed. 



F. excelsior. 

 IL Flowers monosporangiate; calyx evident; leaflets with petiolules. 



L Fruit with a flattish body passing perceptibly into the wing; 



leaves and twigs velvety pubescent. F. profunda. 

 2. Fruit with a terete or nearly terete body. 



a. Wing of the samara extending somewhat down the sides of the 

 body. 



(a) Twigs pubescent. F. pennsylvanica. 



(b) Twigs smooth or nearly so. F. lanceolata. 

 1). Wing of the samara almost entirely terminal. 



(a) Twigs pubescent. F. hiltmoreana. 



(b) Twigs smooth or nearly so. F. americana. 



Key to the Species. 



L Leaflets more or less petiolulate. 3. 

 L Leaflets sessile. 2. 



2. Leaflets 7 — 11, long, gradually tapering to a point, oblong lanceolate. 



F. nigra. 



2. Leaflets short pointed, ovate to obovate. F. excelsior. 



3. Twigs not quadrangular. 4. 



3. Twigs quadrangular; stems sometimes sharply four-angled; leaflets 



^7 — 11, green on both sides, upper ones usually sessile, lower one.s 

 short petiolulate. F. qiiadrangulata. 



4. Twigs pubescent, often velvety. 5. 



4. Twigs smooth or nearly so. 7. 



5. Leaflets ovate to ovate lanceolate; base usually trimcate or rounded, 



unsymmetrical; upper surface dark 3'ellow green, soft pubescent 

 beneath, calyx large. F. profunda. 



5. Leaflets ovate, ovate-lanceolate, or lanceolate, usuall}' acute at the 

 3l base; calyx minute. 6. 



6. Leaflets pale beneath, ovate to ovate lanceolate, 7 — 11; wing of samara 



terminal or nearly so. F. hiltmoreana. 

 G. Leaflets green or greenish beneath, ovate-lanceolate to lanceolate, 

 5 — 9; samara with a decurrent wing. F. pennsylvanica. 



7. Leaflets pale beneath, ovate to ovate-lanceolate, entire or indefinitely 



serrate, abruptly acute or acuminate, glabrous or somewhat 

 pubescent; wing of samara terminal. F. americana. 

 7. Leaflets green on both sides, glaI)rous or somewhat pubescent, usually 

 serrate, lanceolate to ovate-lanceolate, acuminate; wing of samara 

 decurrent on the sides of the slender body. F. lanceolata. 



Fraxinus L. Ash. 



Deciduous trees usually with a furrowed bark; lij^ht, tough 

 wood; large, light-colored, round pith and large terminal buds. 

 Lateral buds obtuse, somewhat flattened; bundle scars crowded 

 in a curved line; leaves opposite, usually odd-pinnate; flowers 

 inconspicuous, perfectly or imperfectly monosporangiate, some- 



