ANACARDIACE^. (CASHEW FAMILY.) 119 



§ 1. KHUS proper. Fruit symmetrical, with the stijles terminal. 



* Flowers poli/fjamous, in a terminal thi/rsoid panicle : fruit globular, clothed 



with acid crimso)i hairs ; stone smooth ; leaves odd-pinnate. {Not poisonous.) 

 — (§ Sumac, DC.) 



1. R. typhina, L. (Staghorx Sumach.) Branches and stalks denseh/ 

 lelrefi/diairij : leaflets 11 -31, pale beneath, oblong-lanceolate, pointed, serrate, 

 rarely laciniate. — Hillsides. June. — Shrub or tree 10-30° liigh, with orange- 

 colored wood. Apparently hybridizes with the next. 



2. R. glabra, L. (Smooth S.) Smooth, somewhat (jlaucous ; leaflets 11 - 

 31, whitened beneath, lanceolate-oblong, pointed, serrate. — Rocky or barren 

 soil. June, July. — Shrub 2- 12° high. A var. has laciniate leaflets. 



3. R. COpallina, L. (Dwarf S.) Branches and stalks down// ; petioles 

 wing-mart/ined between the 9-21 oblong or ovate-lanceolate (often entire) leaf- 

 lets, whicli are oblique or unequal at the base, smooth and shining above. — 

 Rocky hills. July. — Shrub 1 -7° high, with running roots. 



* * Flowers polijgamous, in loose and slender axillary panicles ; fruit globular, 



glabrous, ichitish or dun-colored ; the stone striate; teares odd-pinnate or 3- 

 J'oliolate, thin. (Poisonous.) — (§ Toxicodexdrox, DC) 



4. R. venenata, DC. (Poison S. or Dogwood.) Smooth, or nearly 

 so; leaflets 7-13, obovate-oblong, entire. — Swamps. June. — Shrub 6-18° 

 high. The most poisonous species ; also called Poison Elder. 



5. R. Toxicodendron, L. (Poisox Iw. Poisox Oak.) Climbing 

 by rootlets over rocks, etc., or ascending trees, or sometimes low and erect; 

 leaflets 3, rhond)ic-ovate, mostly pointed, and rather doAvny beneath, variously 

 notched, sinuate, or cut-lobed, — high-climbing plants (R. radlcans, L.) having 

 usually more entire leaves. -^ Thickets, low grounds, etc. June. 



* * * Flowers polygamo-dicecious, in small solitary or clustered spikes or head^,,-f,; 



ivhich develop in spring be/ore the leaves ; leaves 3-Joliolate ; fruit as in jir^f ,.^ 

 group. {Xot poisonous). — (§ Lobadium, Torr. &- (iray.) 



6. R. Canadensis, Marsh. Leaves soft-pubescent when voung, 

 ing glabrate ; leaflets rhombic-obovate or ovate, unequally cut-toothed 

 long, the terminal one cuneate at base and sometimes 3-cleft ; flowers pale 

 yellow. (R. aromatica, .1//.) — Dry rocky banks, W. \'t. to Minn., atid 

 southward. — A straggling bush, 3-7° higli ; the crushed leaves not unpleas- 

 antly scented. 



Var. trilob^ta, Cray. With smaller leaflets (j- 1' long), crenately fe\r- 

 lobed or iucise<l toward the summit. — Long Pine, Neb,, and common west- 

 w^ard. Unpleasantly scented. 



§ 2. COTINUS. Ovary becoming very gibbous in fruit, with the remains of the 

 styles lateral ; flowers in loose ample panicles, the pedicels elongating and 

 becoming plumose ; leaves simple, entire. 



7. R. COtinoides, Xntt. Glabrous or nearly so ; leaves thin, oval, 3-6' 

 long; flowers and fruit as in the cultivated Smoke-tree (R. Cotinus) — Mo. to 

 Tenn., and southward. — A tree, 25-40° high. 



