Proceedings of the Ohio State Academy of Science SS' 



23. Leaves pointed at the l)ase. widest above tlie middle, 



lower surface pubescent ; fruit a nut-like drupe. 



Symplocos. (67). 



24. With prominent deciduous stipules ; bark not resinous. 



Cydonia. (39). 



24. Without stipules ; bark resinous, aromatic. Cotinus. (53). 



— ^5— 



25. Lateral veins from the midril) straight and parallel or 



nearly so ; some or .all lateral veins usually ending in 

 the serrations, teeth or lobes. 26. 



25. Lateral veins not straight anrl parallel. T,y. 



26. Leaves not 2-ranked. 2^. 



26. Leaves quite regularl}- 2-ranked, that is with the third 



leaf over the first. 30. 



27. Pith 3-angled, buds stalked. Alnus. (19). 

 27. Pith 5-angled, buds not stalked. 28. 



27. Pith cylindrical or nearly so. 29. 



28. Leaves or their lobes bristle-tipped, or if not bristle- 



tipped then the teeth or lobes not sharply acuminate ; 

 buds clustered at the tip of the twig; nut in a cup- 

 like involucre of numerous scales. Quercus. (22). 



28. Leaves with sharply acuminate teeth ; buds not 



clustered at tlie tip ; nuts with a prickl}- or spiny 

 involucre. Castanea. (21). 



29. Usually with prominent and typical lateral thorns; 



carpels of the pome bony. Crataegus. (41 ). 

 29. A\'ithout thorns but sometimes with thorn-like stunted 

 branches; leaves irregularly dentate, serrate, or 

 crenate-dentate ; sometimes lobed ; pome fleshy with- 

 out grit cells ; carpels papery or leathery. Malus. (38). 



29. ^\'ithout thorns ; leaves serrate or serrate-dentate ; pome 



berry-like, carjjels not bony. Amelanchier. (40). 



30. Leaves decidedly inequilateral at the base. 31. 



30. Leaves not inequilateral or only very slightly so. 32. 



31. Axillary buds prominently stalked; lea\es repand- 



dentate. Hamamelis. (29). 



