ANACARDIACEJS. (CASHEW FAMILY.) 79 
* Not poisonous: fruit clothed with (acid) crimson hairs: panicle 
compound , dense , terminal: leaves odd-pinnate. 
1* J*. typliina, L. (Staghorn Sumach.) Branches and 
stalks densely velvety-hairy; leaflets 11-31, pale beneath, oblong- 
lanceolate, pointed, serrate. — Hill-sides. June. —A large shrub, or 
a spreading tree. 20°-30° high, with orange-colored aromatic wood, 
and copious milky-resinous juice. 
2. R. glabra, L. (Smooth Sumach.) Smooth , someichat 
glaucous; leaflets 11-31, whitened beneath, lanceolate-oblong, point¬ 
ed, serrate. — Rocky or barren soil. July. — Smaller than No. 1. 
3. R. copallina, L. (Dwarf Sumach.) Branches and 
stalks downy ; petioles winged-margined between the 9-21 oblong or 
ovate-lanceolate leaflets, which are oblique or unequal at the base, 
smooth and shining above.— Rocky hills. July. — Shrub 2°-7° high, 
with running roots. Leaflets variable, entire or sparingly toothed. 
* * Poisonous to the touch : fruit smooth : panicles axillary. 
4. R. venenata, DC. (Poison Sumach.) Smooth, or 
nearly so; leaves odd-pinnate ; leaflets 7 —13, obovate-oblong, some¬ 
what pointed at both ends, entire. (R. Vernix, L., partly.) Swamps. 
June —Shrub 10°-lf*> high, with thin light-green foliage and dun- 
colored fruit. The most poisonous species, even the efiluvium affect¬ 
ing many persons. It is also called, inappropriately, Poison Elder 
and Poison Dogwood. 
5. R. Toxicodendron, L. (Poison Ivy. Poison Oak.) 
Climbing by rootlets over rocks, &c., or ascending trees ; leaves with 3 
leaflets , which are rhombic-ovate, mostly pointed, and rather downy 
beneath, variously notched or cut-lobed, or entire. — When climbing 
trees it is R. radicans, L. — Thickets, fence-rows, &c. June. Less 
poisonous than No 4. 
§ 2. LobIdium, Raf. — Flowers dioecious , in clustered scaly-bracted 
spikes like catkins , preceding the leaves : disk 5-partcd. (,Not poi¬ 
sonous.) 
6. R. aromdtica, Ait. (Fragrant Sumach.) Leaves pu¬ 
bescent when young, thickish when old; leaflets 3, rhombic-ovate, 
unequally cut-toothed, the middle one wedge-shaped at the base; 
flowers yellow; fruit downy with acid hairs. — Dry rocky soil, Ver¬ 
mont to Michigan. April.— A jlow straggling bush, the crushed 
leaves sweet-scented. 
Order 31. ACERACEAS. (Maple Family.) 
Trees , with opposite dotless leaves , without stipules , yield¬ 
ing a sweet sap , regular hut often apetalous or unsymmetri- 
cal polygamo-dicecious small flowers, and a 2 -winged fruit . 
