126 TEREBINTHACEiE. [Rhus. 



Columbia. Douglas. — This, again, is a species very distinct from any of the preceding-. It forms a handsome 

 white-flowered sTirub, 4-8 feet high, according to Mr. Douglas. The stems and branches are glabrous, 

 rounded, tinged with purple. Petioles an inch long, slender, very hairy when young. Leaves small 

 when the plant is in blossom, when in fruit, 3 inches and more long, thin and membranous, having three 

 nerves, (two lateral ones, and the mid-rib springing from the base ;) but these are less strong than in the 

 preceding species, uid scarcely differ from the oblique lateral nerves which branch off from the mid-rib. 

 Thyrsus many-flowered. Berries dry, brown, 3-lobed, 3-seeded, tipped with the persistent s^le. 



Ord. XXVII. TEREBINTHACEa:. Juss. 



TrIB. SuMACHINEiE, DC, 



i. RHtJS. Linn. 



CaL parvus 3-partitus persistens. Pet 5 ovata patentia. Stam, 5 omnia in masc, 

 et hermaphrod.j antherifera. Ovarium subglobosum, 1-locuIare. Styli breves 3, aut 

 stigmata 3 sessilia. Drupa fere exsucca l-locularis, nucleo osseo forsan abortu 1- 

 spermo et interdum 2-3-spermo. Semen exalbuminosum, funiculo fundo nucelei orto 

 inversum. Cotyledones foliaceae, Madicula cotyledonum rimse superius incumbens. 



{Geertn.) — Frutlces, Jbliis altemis variis swpius compositis, Jlorihiis scepe abortu polygamis 

 dioicisve. DC, 



Sect. L Sumac. * Jbliis impari-pinnatis, 



1. Rntyphina; foliis 8-10-jugis, petiolis immarginatis ramisque hirsutissimis, foliolis 

 lanceolatis acuminatis grosse serratis subtus pubescenti-pilosis. — Linn, Sp. PL p. 380. 

 MicL Am, v, I, p, 182. Purshy FL Am, v, I, p, 204. Elliott, Carol, v. I, p. 360. Torrey, 

 Fl, of Un. St V. 1. p, 329. De Cand. Prodr. v. 2. p. 67. Bigel Fl, Bost ed. 2, p. 118. 



Hab. Canada. Michaux, Kear Quebec, Mrs, PerczVo/.— The It viridiftora of Poir. and De Cand. 

 {R, canadensis. Mill. Diet.) is probably only a less hairy variety of this. Berries velvety, rich-purple. 



2, R, glabra; foliis 8-10-jugis, petiolis immarginatis ramisque glabris, foliolis lanceo- 

 lato-oblongis acuminatis serratis subtus albicantibus. — Linn, Sp, PL p, SSO. Mich. Am, 

 V, I. p, 182. Pursh, FL Am, v. 1, p. 204.. Elliott^ CaroL v. 1. p, 361. Torrey, Fl.ofUn. 

 St, v.l.p, 322. De Cand, Prodr. v, 2. p. 67. BigeL FL Bost, ed, 2. ;?. 118. 



Hab. Canada ; and as far north as the Saskatchawan. 7>a Rickardson.—Berries clothed, with a down 

 which is said to contain the malic acid. The leaves are astringent, and used in tanning;. I have not 

 ventured to introduce the JR. copallinum as a native of the British Settlements, because, though found in 

 the adjoining territories of the United States, I have never seen Canadian specimens. 



3. R, venenata; foliis 5-6-jugis (deciduis) glabriusculis, petiolo aptero, foliolis, ovato- 



oblongis acuminatis integerrimis. — De Carid, Prodr, v, 2. p, 68. — R. vernix. Linn, Sp. PL 



p, 380. (non Mat. Med,) Mich, Am. v. 1. p. 183. Pursh, Fl. Am, v. 1. p. 205. Elliott, 



CaroL v. l,p, 362. Torrey, FL of Un. St v, I. p, 323. BigeL Fl. Bost ed. 2. p, 119, Med. 

 Bot t 10. 



Hab. Canada. Pursh, — This is the famous Poison -Sumach, Swamp-Sumach, or Poison -Elder, of the 

 United States. An admirable history of it is given in the Medical Botany of Dr. Bigelow, above-quoted. 

 Berries glabrous, almost white. 



