KEY TO GENERA AND SPECIES 19 



25. Leaves thin or else hairy beneath, drop- 



ping at the end of the season 27. 



26. Leaves 2 to 5 inches long, green on the 



under surface. New Brunswick and 

 south westward. (Fig. 33.) Mountain 

 Laurel, Calico Bush, Spoonwood, Mofnt^n 

 Kalmia latifolia L. 



26. Leaves 4 to 1 2 inches long, with a russet, tawny, 

 or cinnamon-colored under surface. Central 

 New England south westward, also 

 locally in Nova Scotia and northern 

 New England. (Fig. 34.) Rhodo- 

 dendron, Great Laurel, Rose Bay, 

 Rhododendron maximum L. 



27. Side veins curving nearly to the apex 



of the leaf Cornel, 201. 

 27. Side veins not curving nearly to the 

 Rhod 3 o 4 ' apex of the leaf 28. 



dendron. 



28. Branches with at least a few spines or 

 thorns (usually many). Lower Mis-' 

 sissippi valley, also cult, and escaped. 

 (Figs. 35, 36.) Osage Orange, Ma- 

 dura pomifera (Raf.) Schneider. 



28. Branches without spines or thorns 



2Q. Orange. 



