26 LAWSON": EEVISIOTST OF THE 



in the achenes, ■which arc nearly half an inch long, narrow, loug-acuminate and less 

 curved than in that ; it seems to be allied to T. Cormiti, the filaments not thickened 

 upwards as in that species. 



Tlialidrum occidentale. Gray, Proc. Am. Acad., VIII., p. 3*72. Watson, Proc. Am. Acad., 

 XI., p. T21, (18t6). Brewer & Watson, Bot. Calif., ed. 2, I., p. 4. 



British Columbia to W. Montana. — Watson. Oregon to Montana. — Bol. Calif. 



3. — Thalictrum DIOICUM, Linnœus. 



Root of strong thick fibres, sometimes almost tuberous. Stem twelve or fourteen 

 inches, varying to two feet or more in height, with long-stalked ternately compound 

 leaves, composed of rounded thin broad-lobcd leallets, green above, glaucous beneath. 

 Flowers dioecious (or polygamous), in panicles, sepals greenish, with yellow or dull 

 purple long slender pendent anthers. Carpels deeply furrowed, several u.sually abortive. 



TluiUrtrum dioicum. Linn., Sp. PI. p. 168. Alton f , Hort. Kew., ed. 2, III, p. 347. Pursh, 

 FL, p. 388. DC. Syst. Nat., I, p. 173. Hook., Fl. Bor.-Am., I., p. 3. Torr. & Gr., Fl. I, p. 

 38. Hook, f., Arct. PL, p. 283. Chapman,' Fl. So. U. S., p. 5. PI. Bourgeau, 254. Wood. 

 Class Book and Flora, p. 204. Provaucher, Fl. Can., p. 5. Gray, Manual, 5 ed., p. 39, 

 Lawsou, Rauunc. Canad., p. 32. Watson, Bibl. Index, I, p. 26. Macoun, Cat., No. 20. 



T. Iccvigatum. Michaux, Fl., I, p. 322, (DC.) Persoon, Synops. PL, II, p. 100. 



Grassy banks of rivers ; most abundant in the central limestone districts, from Canada 

 to the banks of the Mackenzie River in lat. 6t°. — Richardson. Found also on the eastern base 

 of the Rocky Mountains. — Drummond. And on the banks of the Columbia. — Mr. Garry. ' 

 Not found on the barren grounds, nor on naked alpine situations. — iJooA'. ,F1. Bor.-Am. 



Dry woods and banks, common in central Ontario, as woods about Trenton, June, 1862, 

 and around Gananoque Lake, Birch Island, &c., May, 1861 ; near Kingston Mills, and 

 woods near Kingston Depot, 2nd May, 1860. — Lawson. Mountain side, Hamilton, 12th 

 May, 1860. — Judge Logie. Prescott and Ottawa, common. — B. Billings jr. Ellis Bay, 

 Anticosti, July 4. — J. Richardson. Anticosti. — Verill. Niagara Falls and Maiden. — Dr. P. W. 

 Maclagan. Belleville, abundant in rich woods. — Macoun. Montreal Mountain, 1848. — 

 James Adie. Mackenzie River, above Fort Simpson, 22ud June, 1853 ; Trout Lake, June ; 

 between Severn and Trout Lake, June. — McTavish. Near the big lake of Harrington, Co. 

 Argenteuil, July, 1861.— Dr. John Bell. Assiniboine, July, 1861.— D/-. SchuUz, No. 71. In 

 New Brunswick, at Keswick Ridge, rare. — Fowler. Flat lauds, Restigouche. — Chalmers. 



This plant was cultivated in England by Mr. Philip Miller in 1759. Mill. Diet. ed. 

 7, n. 0. 



4. — Thalictrum alpinum, Linnœns. 



Root fibrous, stem simple, smooth, three to six inches high, leaves nearly all radical, 

 long-stalked, biternate. Flowers hermaphrodite, in a simple raceme. Carpels shortly 

 stalked, tipped with the hooked style. 



Thalictrum alpinum. Linn., Sp. PL, p. 767. Fl. Lapponica, p. 225. Hudson, Fl. 

 Anglica. Withering, Fl. Brit. Lightfoot, Fl. Scot., p. 286, t. 13 f. i. DC, Syst. Nat., I., p. 

 175. Prod., I., p. 12. Bot. Mag., t. 2237. Torr. & Gr., Fl. N. A., I., p. 39. Wood, CI. Bk. 



