54 FOREST TREES OF NORTH AMERICA. 



72. Rhus venenata, De Candolle, 



Prodr. ii, 68. Hooker, Fl. Bor.-Am. i, 126. Don, Miller's Diet, il, 71. Beck, Bot. 76. Spach, Hist. Veg. il,215. Lindley, Fl. Med. 284.- 

 Loadon, Arboretum, ii, 552, f. 226. Torrey &. Gray, Fl. N. America, i, 218, 681. Eaton & Wright, Bot. 392. Dietrich, Syn. ii, 

 1003. Torrey, Fl. N. York, i, 130. Browne, Trees of America, 186.^5rifflth, Med. Bot. 185. Emerson, Trees Mussachnsetts, 

 504; 2 e<l. ii, 575 &. t. Darlington, Fl. Cestrica, 3 ed. 44. Richardson, Arctic Exped. 424. Cooper in Smithsonian Rep. 1858, 

 250. Chapman, Fl. S. States, 69. Curtis in Rep. Geological Surv. N. Carolina, 1860, iii, 93. Lesquorenx in Owen's 2<1 Kep. 

 Arkansas, 353. Wood, CI. Book, 284; Bot. & Fl. 73. Gray, Manual N. States, 5 ed. 111. Vasey, Cat. Forest Trees, 11. 

 Bailey in Am. Nat. vii, 5, f. 3. Ward in Bull. U. S. Nat. Mns. No. 22, 73. Engler in De Candolle, Snites, iv, 39f. 



B. vernix, Linniens, Spec. 1 ed. 265, in part. Ealm, Travels, English ed. 177. Medicus, Bot. Beobaeht. 1782, 223. Marshall, 

 Arbustnm, 130. Wangenheim, Amer. 92. Alton, Hort. Kcw.i, 366; 2 ed. ii, 163. Plcnck, Icon. t. 234. Lamarck, III. 

 ii, 346, t. 207, f. 2. Willdenow, Spec, i, 1479; Eunm. i, 323. B. S. Barton, Coll. i, 23, 50. Schknhr, Handb. 236. 

 Micbaux, Fl. Bor.-Am. i, 183. Nouvoau Dnbamel, ii, 165. Persoon, Syn. i, 324. Dosfoiitaines, Hist. Arb. ii, ;i25. 

 Poiret in Lamarck, Diet, vii, 505. Nuttall, Genera, i, 203. Barton, Prodr. Fl. Philadelph. 39 ; Compend. Fl. Philadelph. 

 154. Pursh, Fl.Am. Sept. i, 20,5. Eaton, Manual, M; 6 ed. 302. Bigelow, Med. Bot. i, 96, t.lO; FL Boston. 3 ed. 

 126. Roemer & Schultes, Syst.vi, 646. Hayne, Dend. F). 34. ElUott, Sk.i, 362. Torrey, FL U. S. 323; Compend. 

 Fl. N. States, 203. Sprengel, Syst. i, 936. Hooker, Jour. Bot. i, 202. Darby, Bot. S. States, 255. Porcher, Resources 

 S. Forests, 206. 



POISON SUMACH. POISON ELDER. 



Northern Few England, south to northern Georgia, Alabama, and western Louisiana, west to northern 

 Minnesota, Missouri, and Arkansas. 



A small tree, 6 to 8 meters in height, with a trunk sometimes 0.15 to 0.20 meter in diameter, or more often a 

 tall shrub; low, wet swamps or, more rarely, on higher ground. 



Wood light, soft, coarse-grained, moderately comi)act; layers of annual growth clearly marked by three or four 

 rows of large open ducts; medullary rays thin, very obscure ; color, light yellow streaked with brown, the sap-wood 

 lighter ; specific gravity, 0.4382 ; ash, 0.64. 



The whole plant, as well as the allied B. Toxicodendron, to most persons exceedingly poisonous to the touch, 

 owing to the presence of a volatile principle, Toxicodendric acid ( U. S. I>ispensatory, 14 ed. 908. Nat. Dispensatory, 2 ed. 

 1464); the white milky sap turning black in drying and yielding a valuable lacquer {Bigelow, Med. Bot. I. c.) 



73. Rhus Metopium, LinnsBus, 



AmoBU. V, 395. Titford, Hort. Bot. Am. 51. Descourtilz, Fl. Med. Antilles, ii, 49, t. 79. De Candolle, Prodr. ii, 67. Macfadyen, Fl. 

 Jamaica, 225. Nuttall, Sylva, ii, 121, t.80; 2 ed. ii, 68, t. 80. Richard, Fl.Cuba, 381. Cooper in Smithsonian Rep. 1859, 264. 

 Grisebach, Fl. British West Indies, 175. Chapman, Fl. S. States, 69. Wood, Bot. & Fl. 73. Vasey, Gat. Forest Trees, 11. 



Metopium Linncei, Engler in De Candolle, Suites, iv, 367. 

 POISON WOOD. CORAL SUMACH. MOUNTAIN MANCHINEEL. BUM WOOD. HOG PLUM. DOCTOR GUM. 



Semi-tropical Florida, bay Biscayne to the southern keys; in the West Indies. 



A tree 12 to 15 meters in height, with a trunk sometimes 0.60 meter in diameter, reaching in the United 

 States its greatest development on the shores of bay Biscayne, near Miami; one of the most common trees of the 

 region, the large specimens generally decayed. 



Wood heavy, hard, not strong, close-grained, checking badly in drying, containing many evenly-distributed 

 open ducts; medullary rays numerous, thin; color, rich dark brown streaked with red, the sap-wood light brown 

 or yellow; specific gravity, 0.7917; ash, 2.39; little esteemed. 



A resinous gum, emetic, purgative, and ditu-etic, is obtained from incisions made in the bark of this species 

 (Pharm. Jour, vii, 270. Guibourt, Hist. Drogues, 7 ed. iii, 489). 



* 74. Pistacia Mexicana, HBK. 



Nov. Gen. & Spec, vii, 22, t. 608. De Candolle, Prodr. ii, 64. Gray in Smithsonian Contrib. v, 27. Torrey, Bot. Mex. Boundary Survey, 

 44. Cooper in Smithsonian Rep. 1858, 265. Brewer & Watson, Bot. California, i, 109. Vasey, Cat. Forest Trees, 11. Hemsley, 

 Bot. Am.-Cent. i, 221. Watson in Proc. Am. Acad, xvii, 338. 



Texas, valley of the Rio Grande (near the mouth of the Pecos river, Bigelow); southward into Mexico (Saltillo, 

 Palmer, etc.). 



Wood not collected. 



