G.27] CLASSIFICATION AND DESCRIPTION 89 



Negundo aceroldes, Moench. (ASH- 

 LEAVED MAPLE. BOX-ELDER.) Leaves 

 pinnate, of 3 to 5 (rai'ely 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. CaUfornicum, Torr. and Gray (the N - aoenddes. 



under drawing in the figure), has leaflets more deeply cut, thicker, 

 and quite hairy; it is occasionally cultivated. 



ORDER XVI. ANACAK.DlACE.a3. 



(CASHEW FAMILY.) 



Trees and shrubs, mainly of the tropical regions, here 

 represented by only one genus : 



GENUS 27. RHfJS. 



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 (}fa in.), indehis- 

 cent, dry drupes in large clusters, generally remaining 

 on through the autumn. 



* Leaves simple, rounded, entire 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 



nearly so 3. 



A. Twigs smooth. (B.) 



B. Rachis of leaf broadly winged; leaflets serrate 5. 



B. Raehis not winged. (0.) 



C. Leaflets 11 to 31, serrate ; fruit hairy 2. 



C. Leaflets 7 to 13, entire; fruit smooth; poisonous 4. 



* Leaves twice-pinnate ; variety under 2. 



