i86 
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. quad ran gut at a. 
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. 
II. Flowers monosporangiate; calyx evident; leaflets with petiolules. 
1. 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. 
b. Wing of the samara almost entirely terminal. 
(a) Twigs pubescent. F. biltmoreana. 
(b) Twigs smooth or nearly so. F. americana. 
Key to the Species. 
1. Leaflets more or less petiolulate. 3. 
1. 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 
tftk" —11, green on both sides, upper ones usually sessile, lower ones 
short petiolulate. F. quadrangulala. 
4. Twigs pubescent, often velvety. 5. 
4. Twigs smooth or nearly so. 7. 
5. Leaflets ovate to ovate lanceolate; base usually truncate or rounded, 
unsymmetrical; upper surface dark yellow green, soft pubescent 
beneath, calyx large. F. profunda. 
5. Leaflets ovate, ovate-lanceolate, or lanceolate, usually acute at the 
base; calyx minute. 6. 
6. Leaflets pale beneath, ovate to ovate lanceolate, 7—11; wing of samara 
terminal or nearly so. F. biltmoreana. 
6. 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, glabrous 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; light, 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- 
