382 ANACARDIACE.E. Rhus. 



R. cotinoides, Nitt. (American Smoke-tree, Chittam-wood.) Tree 25 to 40 feet 

 hi"-li with soft and light orauge-colored wood, glabrous or nearly so : leaves thin and mem- 

 branaceous, oval, witii mostly acute or narrowed base, 3 to 6 inches long: flowers (greenish 

 yellow) ami fruit as in A*. Culimis. — Xutt. in Torr. & Gray, Fl. i. 217, as synonym ; Cliai.m. 

 Fl. 70; C. Mohr, Proc. Acad. Philad. 1881, 217 ; Sargent, U. S. 10th Census, ix. 52. R. Co- 

 </ni(s, Nutt. Trav. Arkansas, 177. It. Cotinus? Tott. & Gray, Fl. i. 216.1 Cotinus Ameri- 

 canus, Xutt. Sylv. iii. 1, t. 81.2 — Wooded calcareous banks, on Grand River, a tributary of 

 the Arkansas" (in the Indian Territory), Nutlall, also N. Alabama,'' in the mountains, 

 Buckley, Nevius, Mohr ; rare and local. 



§ 2. Metopium. Drupe symmetrical, glabrous and with thin chartaceous and 

 smooth putamen ; style very short and undivided; stigma 3-lobed : flowers in 

 ample loose panicles, perfect or barely polygamous: leaves pinnate. — Metopium, 

 P. Br. Jam. 177, t. 13, f. 3 ; Engler, 1. c. 367, t. 13, f. 32-38. 



R. Metopium, T^. (Jamaica Sumach, Poison-wood, but hardly poisonous.) Low tree, 

 olalmms: leaves usually 5-foliolate ; leaflets long-petiolulate, ovate, with rounded or sub- 

 cordate base, from -obtuse or emarginate to abruptly acuminate, entire (or undulate-mar- 

 gined), shining above, 2 to 4 inches long: fruit obovoid or oblong, scarlet when ripe. — 

 Syst. Nat. ed. 10, 964, Amcen. Acad. v. 395, & Spec. ed. 2, i. 381 (P. Br. 1. c, Sloane, Jam. 

 lit. 199, f. 3) ; Descourt. Fl. Ant. ii. t. 79 ; Chapm. Fl. 69.* Metopium Linnoii, Engler, 1. c. 

 — S. Florida along the coast and on the keys. (W. Ind.) 



§ 3. Rhus proper. Drupe symmetrical or nearly so, with crustaceous or bony 

 putamen ; short styles and stigmas distinct or partly united : flowers mostly 

 polygamous, in some dioecious : leaves (turning red in autumn) and inflorescence 

 various. 



* ToxicoDENDROX. Drupes dun-colored or whitish, the thin and almost always glabrous 

 epicarp at length falling away from the granular-waxy mesocarp, this traversed by copious 

 longitudinal or partly reticulating fibres in one or two series and more persisting around 

 the dull and somewhat rugose or undulate stone (putamen) : leaves deciduous, pinnately 

 3-several-foliolate : flowers in axillary open panicles : whole plants glabrous or glabrate, 

 occasionally pubescent, the juice and effluvium acrid-poisonous ; fl. summer. — Toriro- 

 dendion, Tourn. Inst. 610; Mill. Diet. ed. 8. Rhus § Toxicodendron, Gray, Man. eds. 2-5 ; 

 DC, and Engler, in part. (R. trichocarpa, Miq., is of this section, notwithstanding tlie 

 hirtillous drupe : a Japanese form of R. Toxicodendron has the same anomaly in a less 

 degree.) 

 -J- Leaves trifoliolate : panicles short : stems in same species sometimes erect but low, 

 sometimes climbing (even to the tops of trees) by multitudinous rootlets (never " volu- 

 ble "). — Poison Vines. 

 R. Toxicodendron, L. (Poison Ivy, Poison Oak.) Glabrous, or more commonly with 

 young foliage and often the adult more or less pubescent, or villous-bcarded on midrib and 

 veins beneath : leaflets variously ovate, all or some acuminate (2 to 5 inches long), entire or 

 angulate-dentate or sinuate or 3-5-lobed, lateral ones sliort-petiolulate : panicles almost 

 always shorter than the petioles: drupes 2 or 3 lines in diameter; waxy mesocarp multi- 

 costate when dry, the outer circle of fibres being much impressed. — Michx. Fl. i. 183; 

 Pursh, Fl. i. 205 ; Sims, Bot. Mag. t. 1806 (" o, vuhjare ") ; Nouv. Duham. ii. t. 48 ; Torr. & 

 Gray, Fl. i. 218; Emerson, Trees & Shrubs Mass. ed. 2, ii. 577, with plate ; Engler, 1. c. 393, 

 excl. var. R. Toxicodendron, & R. radicans, L. Spec. i. 266, & ed. 2, i. 381 (Cornuti, Canad. 

 f. 97 ; Dill. Elth. t. 291), & various authors.^ In general the high climbing plants have the 



1 Add syn. R. Americamts, Sudworth, Bull. Torr. Club, xix. 80. 



2 Add Sargent, Silv. iii. 3, t. 98, 99. C. cotinmdes, Britton, Mem. Torr. Club, v. 21C. 



3 Also mountains of E. Tennessee, and near Medina River, W.Texas, Keverchon, ace. to Sargent, 1. c. 



4 Add Sargent. Silv. iii. 13, t. 100, 101. 



6 A noteworthy form from the Keys of Florida (where coll. in fruit by Bhdgett) has been called 

 R. Blodgetdi by Kearney, Bull. Torr. Club, xxi. 486. It differs in its somewhat smaller drupes and 



