Columbia. Dom^/os.—This, again, is a species very distinct from any of the preceding. It forms a handsome
white-flowered shrub, 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, and scarcely differ from the oblique lateral nerves which branch off from the mid-rib.
Thyrsus many-flowered. Bernes dry, brown, 3-lobed, 3-seeded, tipped with the persistent style.
Orb. XXVII. TEREBINTHACEÆ. Juss.
T rib. Sumachineæ. DC.
1. RHUS. Zmn.
CaL parvus 3-partitus persistens. Pet. 5 ovata patentia. Siam. 5 omnia in masc.
et hermaphrod., antberifera, Ovarium subglobosum, 1-loculare. Styli breves 3, aut
stigmata 3 sessilia., Drupa fere exsucca 1-locuLaris,, nucleo osseo forsan abortu 1-
spermo et iuterdum 2—3-spermo. Semen exalbuminosum, funiculo fondo nucelei orto
inversum. Cotyledones foliaceæ. Radicula cotyledonum rimas superius incumbens.
(Gærtn.)—Frutices, foliis altemis variis scepins compositis, floribns scepe abortu polygamis
dioicisve. DC.
Sect. L Sumac. * foliis impari-pinnatis.
1. R. typkina; foliis S-10-jugis, petiolis immarginatis ramisque hirsutissimis, foliolis
lanceolatis acuminatis grosse serratis subtus pubescenti-pilosis.^—Linn. Sp. PI. p. 380.
Mzch. Am. v. I. p. 182. Pursh, FI. Am. v. 1. p. 204. EUiott, Carol, v. 1. p. 360. Torrey,
FI. o f Un. St. v, 1. p. 322. De Cand. Prodr. v. 2. p. 67. Bigel. FI. Bost. ed. 2. p . 118.
Hab. Canada. Michaux. Near Quebec. Mrs. Percival.—The 22. viridifiora of Poir. and De Cand.
(22. canadensis, Mill. Diet.) is probably only a less hairy variety of this. Berries velvety, rich-purple.
2. R . glabra ; fobis 8-10-jugis, petiolis immarginatis ramisque glabris, foliolis lanceo-
lato-oblongis acuminatis serratis subtus albicantibus.—Linn. Sp. PI. p. 380. Mich. Am.
v. 1. p . 182. Pursh, FI. Am. v. 1. p. 204. ElliottI Carol, v. 1. p . 361. Torrey, FI. o f Un.
St. v. l .p . 322. De Cand. Prodr. v. 2. p. 67. Bigel. FI. Bost. ed. 2. p. 118.
Hab. Canada ; and as far north as the Saskatchawan. Dr. Richardson.?—Berries clothed with a down
whieh is said to contain the malic acid. The leaves are astringent, and used in tanning. I have not
ventured to introduce the 22. 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 Cand. Prodr. v. 2. p. 68.—R*. verriix. Linn. Sp. PI.
p. 380. (non Mat. Med.) Mich. Am. v. 1. p . 183. Pursh, FI. Am. v. 1. p. 205. Elliott,
Carol, v. l .p . 362. Torrey, FI. o f Un. St. v. l .p . 323. Bigel. FI. 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.
* * Foliis tHfoBolatis, foliolo medio petiolato.
4. R. radicans ; caule radicante, foliis 3-foliolatis, foliolis ovato-rotundatis rhomboi-
deisve acutis seu acuminatis glabris iniegris.—Linn. Sp. P I.p . 381. EUiott, Carol, v. l .p .
363. Bigel. Med. Bot t. 42, FI. Bost. ed. 2. p. 120. De Cand. Prodr. v. 2. p . 69.—R. Toxicodendron,
«. Mich. Am. v. 1. p . 183. Pursh, PI. Am. ». I. p. 205.—R. Toxicodendron,
fl. Torrey, FI. o f Un. St. v. 1. p . 322.
Hab. Throughout Canada, to the Saskatchawan. Dr. Richardson; Drummond. North-West America
on « Mount Hood,” and the Blue Mountains.” Douglas.
5. R. Toxicodendron; caule erecto debili, foliis 3-foliolatis, foliolis ovato-rotundatis
subrbomboideis acutis seu acuminatis inciso-angulatis.—Linn. Sp. PI. p. 381. EUiott,
Carol v. f p . 363. De Cand. Prodr. V. 2. p. 69.—«. Torrey, El. o f Un. St. fijj 1. p. 323.
—A quercifolia. Mich. Am. V. l .p . 183. Pursh, FI. Am. v. 1 .p. 205.
Hab. Canada; and, I believe, in the same localities as the preceding. Pursh; Mr. Cleghom; Dr. Richardson;
Drummond; Dowlas.—-American Botanists are at variance with regard to thé distinctive characters
of this and the preceding species. Nuttall says they are certainly different; but most other authors either
unite them, or speak with doubt as to the value of their presumed marks of distinction.
6. lobatà ; caule stricto, ramülis brevibus foliosis, foliis trifoliolatis, foliolis ovatis
obtusissimis varie lobatis, lobis obtusis, sinubus acutis, paniculis laxis petiolo longiorifous.
(Tab. XLVI.)
Fmtex erectus, 3-4-pedalis, ramis teretes, junioribus solumrnodo pubescentibus, ramulis numerosis,
brevibus, patentibus, foliosis. Folia longe petiolata, trifoliolata, foliolis ovatis, unciam ad duas uncias longis,
obtusissimis, membranaceis, basi nunc acutis, nunc rotimdatis truneatisve, subtus præcipue pubescentibus,
profonde et varie lobatis, terminaü suhlonge petiolulato, utrinque subæquahter lobato, lobis præcipuis sub-
tribns, foliolis kteralibus margine exteriori magis profuude lobato. Flores (masculini) flavi, in racemis laxis,
folio breviofibus, petiOlo longioribus. Bracteoe ad basin ramulorum oblongæ, ciliatæ. Cal. profonde ô-partitus,
laciniis oblongis. Petala 5, calycis laciniis multo longiora, obovata, basi in unguem sensim attenuata, dorso
venosa. Stamina h, erecta, petalis parum breviora. Filamenta subulata. Anthères majusculæ, ovatæ,
pallide flavæ, loculis subappositis. Stylus parvus, e centro disci pateriformis, in fondo calycis siti, margine
elevato crispato.
Hab- Common on the outskirts of woods, in dry soils of North-West America. Plentiful at Port-Vancouver.
Douglas. Although nearly allied, as this assuredly is, to the two preceding species, I nevertheless
venture to consider it distinct Its general habit is very different, having erect straight stems, and numerous
smally leafy branches. The leaflets, besides that they are deeply lobed, with acute sinuses, are truly ovate,
very obtuse, and greatly smaller than in any state of 22. Toxicodendron, or 22. radicans which I have seen :
the panicles, too, are exceedingly numerous, and large in proportion to the size of the leaf.
Tab. XLVI. Fig. \, Outside view of a male flower; fig. 2, View of the upper side of a male flower; fig.
3, Stamen; fig. 4, Petal; fig. 5, Disk from the bottom of the calyx, and style from the male flower:—
magnified.
■Sect. II. L obabium. Raf.
7. R. aromatica ; foliis trifoliolatis, foliolis sessilibus inciso-crenatis subtus pubescent-
tibuss intermedio i-hombeo, lateralibus ovato-rhombeis, floribns in amèntïs compactis
dispbritis.-—Ait. Hort. Km>. ed. 1. v. 1. p. 36T. Mich. Am. v. I. p. 184. Pursh, FI. Am.
v. 1. p. 205. EUiott, Carol, v. 1. p . 364. Turpin, in Ann. du Mus. v. 5. p. 445. t. 30.
Torrey, F l o f Un. S t v. 1. p. 324.