@. 27) CLASSIFICATION AND DESCRIPTION 89 
Negtindo aceroides, Moench. (AsH- 
LEAVED MAPLE. Box-ELDER.) Leaves 
pinnate, of 3 to 5 (rarely 7) coarsely and 
sparingly toothed leaflets. Flowers stam- 
inate and pistillate on separate trees, in 
drooping clusters rather earlier than the 
leaves. Fruit on only a portion of the 
trees; wings forming less than a right 
angle. A rather small (30 to 60 ft. high), 
rapidly growing tree, with light pea-green 
twigs; wild from Pennsylvania and south, 
and cultivated throughout. 
Var. Californicum, Torr. and Gray (the Ns aceroldes: 
under drawing in the figure), has leaflets more deeply cut, thicker, 
and quite hairy; it is occasionally cultivated. 
ORDER XVI. ANACARDIACE. 
(CASHEW F'aMILy.) 
Trees and shrubs, mainly of the tropical regions, here 
represented by only one genus: 
Genus 27. RHUS. 
Low trees or shrubs with acrid, often poisonous, usu- 
ally milky juice, and dotless, alternate, usually pinnately 
compound leaves. Flowers greenish-white or yellowish, 
in large terminal panicles. Fruit small (1 in.), indehis- 
cent, dry drupes in large clusters, generally remaining 
on through the autumn. 
* Leaves simple, rounded, entire............... ce... eee 6, 7. 
* Leaves once-pinnate. (A.) 
A. Twigs very hairy; rachis not winged; leaflets 11 to 31 ...1. 
A. Twigs downy; rachis wing-margined; leaflets entire or 
TBP BOs scanners $4 oeeee AUR ae Gade ean Ge 3. 
A. Twigs smooth. (B.) 
B. Rachis of leaf broadly winged; leaflets serrate. ....... 5. 
B. Rachis not winged. (C.) 
C. Leaflets 11 to 31, serrate; fruit hairy .... .......... 2. 
Cc. Leaflets 7 to 13, entire; fruit smooth; poisonous...... 4, 
* Leaves twice-pinnate; variety under....... ......... 0.0.0... 2. 
