KEY TO THE GENERA OF TREES 55 



V. Leaves evergreen, small, 2-3 in. long, thick, with re volute mar- 

 gins. Fruit an acorn . 88. Quercus. 



Fruit red berries 18. Ilex. 



V. Leaves evergreen, oval to lance-oval, usually large ; small trees, 



almost shrubs, (d.) page 56. 



V. Leaves deciduous (some are evergreen in Southern States). (W.) 

 W. Plant more or less spiny, (c.) 

 W. Plant not at all spiny. (X.) 

 X. Leaf-blade thin, long pointed, with curved parallel veins or 



ribs 45. Cornus. 



X. Leaf -blade thin, circular or broadly oval in outline, with blunt, 

 almost rounded apex; veins not regularly parallel . .27. Rhus. 

 X. Leaf quite elongated, 5 or more times as long as wide, (b.) 

 X. Leaves with none of the above peculiarities. (Y.) 

 Y. Deciduous bud-scales (stipules), leaving a scar or mark com- 

 pletely around the stem at the base of the leaves. 1. Magnolia. 



Y. Leaves covered on one or both sides with silvery scales 



71. Elseagnus. 



Y. No such ring around the stem, or silvery scales on the leaves. 

 (Z.) 



Z. Leaves distinctly straight-veined, thin 90. Fagus. 



Z. Leaves thick, obtuse ; fruit an acorn 88. Quercus. 



Z. Leaves 6 in. or more long ; crushed leaves with a rank, fetid 



odor 5. Asimina. 



Z. Leaves 3-5 in. long; twigs and leaves very spicy ; shrub rather 



than tree 70. Lindera. 



Z. Leaves about 2 in. long, oval, on twigs which have ridges extend- 

 ing down from the sides of the leafstalk ; small tree, almost 



a shrub, with beautiful flowers 43. Lagerstroemia. 



Z. Leaves not as above, (a.) 

 a. Fruit a large (^ -1^ in.) rounded pulpy berry with a heavy 



calyx at the base 55. Diospyros. 



a. Fruit small (^ in.), fleshy, drupe-like, with a striate stone; 



limbs branching horizontally, often descending . . .46. Nyssa. 



a. Fruit a black, juicy berry (V<j-j in.), with about 3 seeds 



20. Rhamnus. 



a. Fruit an ovoid dry drupe (j in.) ; leaves sweet-tasting 



59. Symplocos. 



a. Fruit an apple-like pome (Quince) 37. Pyrus. 



b. Wood soft ; both kinds of flowers in catkins in spring ; with 



either stipules or stipular scars 91. Salix. 



b. Wood hard ; leaves thick ; fruit an acorn 88. Quercus. 



c. Fruit a 2 -4-seeded small berry ; juice not milky 



20. Rhamnus. 



