Procccdi)ii^s of tJic Ohio State .'h-adcinx of Science 173 



Styracaceae. Storax Family. 

 68. Mohrodendron I'.ritt. Siherljell. 



Small trees or shrubs, more or less stellate-pubescent, with 

 large, white, bell-shai)C(l flowers and 2-4-wingecl, dry fruit. 



I. Mohrodendron carolinum ( L. ) liritt. Silverbell. A 

 small tree with diaphragmed jjith. In woods and along streams. 

 Va.. to 111., Fla., and Ala. 



Subclass, SVMPETALAE HyP(JGYX.\E. 



Order, Gentianale.s. 



Olcaceae. Olive Family. 



69. Fraxinus L. Ash. 



Trees with o|iposite leaves, in our .s.ijecies odd-pinnate. Fruit 

 a samara. 



1. Lateral leaflets sessile, 7-11; samara winged all around: calyx none. 

 F. nii^ra. 



1. Lateral leaflets more or less stalked: calyx present in the carpellate 



flower. 2. 



2. Body of the samara terete or nearly so, the wing chiefly terminal; 



twigs not 4-sided. :i 

 "2. Body of the samara llat. the wing extending around it; twigs 4-sided, 

 often with 4 sharp ridges especially un vigorous shoots; leaflets 

 7-lL /•. cjuadrcmgnlata. 



3. Wing almost entirely terminal. 4. 



•3. \N ing extending somewhat down the sides of the body of the samara; 

 leaflets 5-9. 5. 



4. Leaves and twigs glabrous or nearly so, pale below, leaflets 5-9. F. 



iniicricdiui. 



4. Leaves and twigs pubescent, leaflets 7-!l. F. biltiuorcana. 



5. Wing of the samara spatulate. 6. 



5. Wing long linear. /-■. daiiingtonii. 



6. Leaves, twigs, and pedicels glabrous or nearly so; leaves bright green 



on both sides. F. lanccolata. 

 6. Leaves, young twigs and pedicels velvety-pubescent: samara 1-2 in. 

 long. F. pcnnsylvanica. 



T. Fraxinus americana L. A\'hite Ash. A large tree of 

 rapid growth, with glabrous twigs. Leaflets 5-9, ovate, ovate- 

 lanceolate, ol)l(>ng, or rareh- slightlv obovate, entire or denticulate, 



