24 LAWSON : REVISION OF THE 



Idaho and Washington Territory." "We have specimens in fruit from Douglas's last 

 Oregon collection." Torr. and Gray, Fl., I., p. 657. 



Sir William Hooker, in describing this plant, observes : " This beautiful species of 

 Clematis is quite unlike any hitherto described ; and I am anxious it should bear the name 

 of its zealous and meritorious discoverer." David Douglas, who w^as a native of Perth- 

 shire, Scotland, greatly distinguished himself as botanical collector for the Horticultural 

 Society of Loudon, in the early days when that flourishing institution was. filling the 

 gardens of England with new and strange plants. But this species does not seem to have 

 ever reached a garden. Douglas met his death in 1834, at the early age of 36 years, by 

 falling into a pit made by the natives of the Sandwich Islands for catching wild animals. 

 (There is a biographical sketch in Loudon's Gardeners' Magazine, for May, 1835, and in 

 Canadian Naturalist, 1860.) 



[C. ALPINA, var. OCHOTENSIS. Leaves biteruately divided, segments oblong-lanceo- 

 late, acixminate, serrate, petals few, linear. {Atragene Odiofensis. Pallas, Fl. Ross., II., 

 p. 69. C. Ochotensis, Poir. DO. Syst. Nat., I., 166.) Prof. Gray expresses surprise that 

 this plant should have been for the first time detected in the New World at a point 

 so far south as Santa Fé. (Plantœ Fendlerianœ Novi-Mexicauœ, p. 4.) In the Old 

 World it is the northern or Siberian form of the European C alpina, but in America 

 it has only, so far, been found in Colorado, Utah and Idaho, according to Mr. J. F. 

 James (Clematis, p. 12), who observes : " Doubtless it is to be found in British America at 

 the north, and may even extend up to Alaska." As yet, however, it cannot be included in 

 our Flora, but will, it is hoped, ere long reward the efforts of some climber on our Rocky 

 Mountains. It is the only species of Clematis common to both America and Europe.] 



Genus II.— THALICTRUM, Unnœus. 

 Hooker and Bentham, Genera Plantarum, I., p. 4. 

 List of species : — 



1. T. Cornuti. 



2. T. occidentale. 



3. T. dioicum. 



4. T. alpinum. 



5. T. sparsiflorum. 



6. T. anemouoides. 

 [T. purpurasceus.] 



1.— Thalictrum Cornuti, Linnœus. 



Root fibrous. Stem strong and tall, prominently furrowed, (three to six feet high). 

 Radical leaves long-stalked, A'ery large, and, like the sessile cauline leaves, ternately 

 decompound ; leaflets large, thick and glaucous or downy beneath, varying from broadly 

 obovate to narrowly elliptical in outline, ternately divided into rather large acute lobes. 

 Flowers numerous, in large showy terminal panicles, dioecious or polygamous ; sepals 

 white ; anthers crowded, erect, on short, stoutish filaments ; stigmas very long, flattened. 

 Carpels numerous, terete, ribbed. Cornute's Thalictruni. 



Tlialictrum Cornuti. Linn., Sp. PL, I., p. 168, (1*758). Alton f., Hort. Kew., ed. 2, III., 



