752 



Oleaceae 



Fraxinus 



50 



Map 1609 



Fraxinus amencana L 



241. STYRACACEAE A.DC. Storax Family 

 6411. STYRAX [Tourn.] L. 

 1. Styrax americana Lam. American Snowbell. Map 1608. Swampy 

 woods and in woodland along streams that usually overflow annually. 

 Local. Its distribution in Indiana offers an interesting problem. 



Va. to Fla. and La., and northw. in the Mississippi Valley to the 

 Kankakee River Valley in Ind. 



243. OLEACEAE Lindl. Olive Family 



Leaves compound; fruit dry, a samara 6420. Fraxinus, p. 752. 



Leaves simple; fruit fleshy, a drupe 6427. Forestiera, p. 754. 



6420. FRAXINUS [Tourn.] L. Ash 



Bark of mature trees furrowed; fruit not winged to the base. 



Body of fruit robust, round and rather abruptly passing into the wing; terminal 

 buds deltoid. 



Branchlets glabrous; axis of the leaves glabrous, rarely somewhat pubescent 



1. F. americana. 



Branchlets pubescent ; axis of leaves pubescent, at least until nearly mature 



2. F. biltmoreana. 



Body of fruit flattened and gradually passing into the wing, gradually tapering from 

 the wings to the base; terminal buds longer than wide. 

 Branchlets glabrous or nearly so and usually smaller than those of F. americana. 

 3. F. lanceolata. 



Branchlets velvety-pubescent, at least when young. 



Calyx of fruit less than 3 mm long; body of samara just below the wing less 

 than 3 mm wide, rarely 4 mm wide, usually 1.4-2.5 mm wide; samaras 



3-4.5 cm long 4. F. pennsylvanica. 



Calyx of fruit more than 3 mm long, generally 4-5 mm long; body of samara 

 just below the wing more than 3 mm wide, usually 4-5 mm wide; samaras 



generally 4-6 cm long 5. F. tomentosa. 



Bark of mature trees scaly or flaky; fruit winged to the base. 



Branchlets and small branches usually 4-angled; leaflets on very short stalks 



6. F. quadrangulata. 



Branchlets and branches round; leaflets sessile 7. F. nigra. 



