KEY TO THE GENERA OF TREES 59 
u. Leaves simple, opposite, evergreen, entire, under 1 in, long 
u. 
u. 
idedel Seb age Re aG Sh ee HN SSeS KEES E RETR SE oR eS ..73. Buxus. 
Leaves simple, evergreen, crenate, 2 in. long..19. Huonymus. 
Leaves simple, deciduous. (v.) 
v. Branches ending in thorns; small trees, or shrubs. (AA.) 
v. Plants not thorny. (w.) 
Ww. 
w. 
w. 
Leaves palmately lobed (one variety, rarely cultivated, lacks 
lobes, but is heart-shaped with a serrate margin), the lobes 
over 3 in number, or with notches or serrations; fruit dry, 
WANSEDS sco diduincwpeamatievedt Sa (Raammonzestes & 25. Acer. 
. Lower leaves palmately 3-lobed, and heart-shaped at base, 
upper ones ovate, all with entire margin; fruit with juicy 
pulp covering the 4 seeds....... ......... 66. Clerodendron. 
. Leaves palmately lobed; fruit small, one-seeded, berry-like 
drupes in large clusters, with flattened stones, or large 
rounded clusters of flowers without stamens or pistils; 
shrubs rather than trees..................00. 47. Viburnum. 
Leaves heart-shaped, entire or slightly angulated (may be 
crenated in Cercidiphyllum), not lobed. ~(DD.) 
Leaves irregularly serrate, somewhat straight-veined ; fruit 
single-winged; large cultivated tree .......... 60. Fraxinus. 
Leaves neither heart-shaped nor lobed; small trees, almost 
shrubs. (x.) 
x. Leaves entire. (z.) 
x. Leaves serrate or dentate, ovate or oval. (y.) 
y- 
y- 
Fruit rounded drupes in large clusters, with single flattened 
SCORES! oc sarsrwdied, one hed ee ee 47. Viburnum. 
Fruit lobed pods, which burst open in the autumn; branch- 
lets somewhat 4-sided .. ...............00.. 19, Luonymus. 
z. Leaves small, lanceolate; flowers and fruit large and beautiful 
Ld aikG He. ELS ERLE Oe, MAC ODERE TA GO UD eee .42.-Punica. 
z. Leaves broad, thin, with curved parallel veins or ribs. 45. Cornus. 
z. Leaves large, broad, oval, without either curved or straight par- 
allel ribs .......... uid senaeen 62. Syringa or 63. Chionanthus, 
AA. Leaves entire and covered on both sides with silvery, pel- 
GALE SCALES jacey eae ceaan cans Pecolo ay eRe 72. Shepherdia, 
AA. Leaves ovate, small, minutely serrate....... 20. Rhamnus. 
BB. Leaves large, 18 in. or more long; leaflets 11 or more, very 
finely serrated or entire ................. 14. Phellodendron. 
BB. Leaves smaller ; leaflets entire or quite evenly toothed, usu- 
ally over 5 in number...............0000-0005 60. Fraxinus 
BB. Leaflets coarsely and quite irregularly toothed, 3-5 (rarely 7 
in numbers... 0c.ceee ee er ee 26. Negundo. 
CC. Leaficts slender-lanceolate ; shrub or small tree with aro- 
matic leaves and somewhat 4-sided branches.....67. Vitea. 
