V 



4 



Reprinted from The Ottawa Natiralist, Vol. XV, No. 3, pp. 71-79, 

 June, 1901, Ottawa, Canada. 



CONTRIBUTIONS TO CANADIAN BOTANY.' 



By James M. Macoun, Assistant Naturalist, Geolog^ical Survey of Canada. 



XIV. 



Th.\lictrum coxfive, Fernald, Rhodora, vol. 11, p. 232. 



Rootstock 2 to 4 cm. longf, bearing 10 to 12 strong" roots: 

 stem slender, 3 to 6 dm. high, puberulent, pale-green, often 

 finely mottled with purple, leafy to the summit : the four or 

 five leaves glandular-pruinose, glaucous beneath, the lower, 

 including the short petiole 3 to 4 cm. long ; leaflets sub- 

 orbicular broadly obovate or flabellate, coarsely toothed, 0.75 

 to I cm. long, the terminal on slender petiolules, the lateral 

 short-petiolulate or subsessile : flowers dioecious, greenish or 

 purplish, the panicles i to 2 dm. high, with ascending 

 branches: sepals greenish, oblong-lanceolate, caducous: car- 

 pels 6 to 10, glandulai-pruinose ; stigmatose style lance-sub- 

 ulate, 3 to 5 mm. long ; achenes ovate-lanceolate, excluding 

 the persistent style, 4 to 5 mm. long, 2 to 3 mm. thick, plump, 

 subterete, scarcely compressed or ancipital with 8 simple or 

 slightly branched strong ribs, the alternate ones strongest; 

 seed linear-lanceolate, hardly filling the cell. 



Thickets, Hemlock Lake, near Ottawa, Ont.,Jn flower, 

 Aug. 8th, 1894. Herb No. 2,956.- {/o/in Macoun.) Also 

 collected in Maine. 



Thalictrum occidentale, Gray. 



T. dioicum purpurascens. Can. Rec. Sci , 1894, p. 77. 



Rootstock slender, elongated : stem glabrous, i m. or 

 less high, leafy to the summit, the three to six leaves glaucous 

 beneath, smooth or minutely glandular, the lower including 

 the long petiole 0.5 to 3 dm. long, those of the inflore' .e 

 often simple ; leaflets thin, reniform or obovate, with coarse 

 rounded lobes, the terminal on slender petiolules, the others 



1 Published by permission of the Director of the Geological Survey of 

 Canada. 



- These numbers are those under which specimens have been distributed 

 from the Herbarium of the Geological Sur\'ey of Canada. 



