A GUIDE AND KEY TO AQUATIC PLANTS 



27. Branches spiny : fruit apple-like (fig. 27) Crataegus, p. 120. 



27. Branches not spiny; fruit not apple-like 28. 



28. Bark falling away in reddish, papery layers Betula, p. 113. 



(fig. 28). 

 28. Bark not falling away in papery layers 29. 



21 



x/3 

 Figure 27. 



Figure 28. 



29. Low, brittle shrub with wood lighter than cork; green Stillingia, p. 121. 



parts with a milky sap (fig. 29). 

 29. Shrubs or trees, not brittle or lighter than cork; sap 30. 

 not milky. 



30. Leaves leathery; evergreen; flowers showy, Gordonia, p. 124. 



white, large (6 cm. across) : tree (fig. 30). 

 30. Leaves not leathery or evergreen (except one 31. 

 species of low-shrubby Leucothoe); flowers 

 not individually large. 



Figure 29. 



Figure 30. 



