14 Imkll) AIanual 



2:^. Leaves truncate or slu)rt-pointed at the base, usually 

 widest below the middle or somewhat oblong, 

 glabrous when mature; fruit a large pulpy berry, 

 very astringent when green. Diospyros. (70). 

 2o. Leaves pointed at the base, widest above the middle, 

 lower surface pubescent: fruit a nut-like drupe. 



Symplocos. (71). 

 24. With i^rominent deciduous stipules; bark not resinous. 



Cydonia. (24). 



24. Without stipules ; bark resinous, aromatic. 



Cotinus. (44). 

 —25— 



25. Lateral veins from the midrib straight and parallel or 



nearly so; some or' all lateral veins usually ending 

 in the serrations, teeth or lobes. 20. 



2-j. Lateral veins not straight and parallel. 37. 



20. Leaves not 2-ranked. 27. 



20. Leaves quite regularly 2-ranked. that is with the third 

 leaf over the first. 30. 



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



27. Pith -Vangled, 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 acumi- 

 nate; buds clustered at the tip of the twig; nut in 

 a cup-like involucre of numerous scales. 



Quercus. (56). 



28. Leaves with sharply acuminate teeth; buds not clus- 



tered at the tip; nuts with a prickly or spiny 

 involucre. Castanea. (55). 



29. L'sually with prominent and typical lateral thorns; 



carpels of the pome bony. Crataegus. (26). 

 29. Without thorns but sometimes 'with thorn-like 

 stunted branches: leaves irregularly dentate, serrate 

 or crenate-dentate; sometimes lobed; pome fleshy 

 without grit cells; carpels papery or leathery. 



Malus. (23). 

 29. Without thorns; leaves serrate or serrate-dentate; 

 pome berry-like, carpels not bony. 



Amelanchier. (25). 



