Rhus. XXX II I. ANACARDIACEiE. tUV.i 



2. 11. TYPiilNA. Sliii^-Zitnii Sinnach. 



Brunches and ;>f7/W/;.s'(U'ns(.']y vfllou.s; Ifls. G— 15 pairs, oblong-lanceolate, 

 acuminate, acutely .scrralf, pubescent beneath; />. red, with crimson hairs. — 

 A larger shrub than the loniier, attaining the height of 20f, in rocky or low 

 barren places, U. S. and Can. Stem with straggling, thick branches. Leaves 

 at length 'Z—'H long. Leailets 2—4' long, \ as wide, .sessile, except the termi- 

 nal odd one. Flowers in terminal, thyrsoiil, den.se panicles, yellowish-green, 

 often 9 cf or Q (^ <^. Drupes compressed, compact, the crimson down very 

 acid. Jn. — The wood is aromatic, of a sulphur-yellow, and used in dyeing. 



/?. laciniata. — Lfts. very irregularly coherent and incised; panicles partly 

 transformed into gashed leaves. Hanover, N. H. Rlckard. 



3. R. coi'Ai.r,iNA. Mountain Sumac. 



Branches and petioles pubescent ; Ifls. 4 — 10 pairs, oval-lanceolate, mostly 

 entire, unequal at base, common 'petiole winged ; Jls. in dense panicles ; drupes 

 red, hairy.— A smaller shrub, not half the height of the last, in dry, rocky pla- 

 ces, U. S and Can. Common petiole about 6' long, expanding into a leafy 

 margin, between each pair of leaflets. Leaflets 1—3' long, near h as wide, 

 dark green and shining on the upper surface. Panicles of flowers terminal, 

 sessile, thyrsoid, 9 J^, greenish Drupes acid. Jl. 

 p. leajicts coarsely and unequally serrate. N. Y. Barratt. 



4. R. VENENATA. DC. (R. vemix. Linn.) Poison Su7nac. Dog-wood. 

 Very glabrous ; lfts. 3 — 6 pairs, oval, abruptly acuminate, very entire ; 



panicles loose, pedunculate ; drupes greenish-yellow, smooth. — A shrub or small 

 tree of fine appearance, 10— 15f high, in swamps, U. S. and Can. Trunk seve- 

 ral inches diam., with spreading branches above. Petioles wingless, red, 6 — 10' 

 long. Leaflets about 3' long, nearly * as wide, ses.sile, except the odd one. 

 Panicles axillary, 9 cf , those of the barren tree more diffitse. Flowers very 

 small, green. Drupes as large as peas. Jn. The whole plant is very poison- 

 ous to the taste or touch, and even taints the air to some distance around with 

 its pernicious eflluvium. 



* * Leaves tcrnate. 



5. R, Toxicodendron. Poison Oak. Poison Ivy. 



Erect or decumbent ; Ivs. pubescent ; lfts. broadly oval, acuminate, entire 

 or sinuate-dentate; fls. in racemose, axillary, subsessile panicles; drupes iimooih, 

 roundish. — Can. and U. S. A small shrub, 1 — oi high, nearly smooth in aU 

 its parts. Leaflets 2 — 6' long, | as wide, petiolate, the common petiole 4 — 5' 

 long. Flowers small, 9 d^- Drupes pale brown. Poisonous, but less so than 

 the last. 



(3. radicans. Torr. (R. radicans. Linn, and of \st edit.) Poisan Ivy. St. 

 climbing 3 — 20 or 50f ! by myriads of radicating tendrils. — It seems now gen- 

 erally conceded that this is but a variety. Certainly, if so, it is a very remark- 

 able one. In damp, shady places. Poisonous. 



6. R. AROMATicA. Ait. Siocet Sumac. 



Lfts. sessile, incisely crenate, pubescent beneath, lateral ones ovate, ter- 

 minal one rhomboid; jls. in close aments, preceding the leaves; drupe globose, 

 villous. — A small, aromatic shrub, 2 — 6f high, in hedges and thickets, Can. and 

 U. S. Leaflets 1 2' long, i as wide, sessile, the common petiole an inch or 

 two in length. Flowers yellowish, with a 5-lobed, glandular disk. Drupes 

 red, acid. May. 



* * * Leaves simple. 



7. R. CoTlNUs. Venetian Sumac. — Lvs. obovate, entire ; fls. mostly abor- 

 tive; pedicels finally elongated and clothed with long hairs. — A small shrub, 6f 

 high, native in Ark. according to Nuttall, remarkable chiefly for the very sin- 

 gular and ornamental appearance of its long, diff'use, feathery fruil-stalks, 

 showing in the distance as if the plant were enveloped in a cloud of smoke. 

 Flowers small, in terminal, compound panicles. Leaves smooth, entire, much 

 rounded at the end. In Italv the plant is used lor tanning, -f 



IS 



