19 19] SARGENT— NORTH AMERICAN TREES 209 



Northwest Coast, 118. 191 5.— Differing from the type in its 

 thicker, more coarsely serrate leaves, densely hoary tomentose 

 below when they unfold, villose aments, and in its pubescent or 

 puberulous branchlets and tomentose winter-buds. Leaves broadly 

 ovate to semiorbicular, rounded or slightly cordate at broad base, 

 abruptly short-pointed or rounded at apex, coarsely crenately ser- 

 rate and sometimes obscurely crispate on the margins, when they 

 unfold covered below and on the petioles with a thick coat of long 

 matted pale hairs and slightly villose above, soon glabrous, and at 

 maturity thick, dark green, lustrous, and scabrate on the upper 

 surface, paler on the lower surface, 8-1 1 cm. long and broad, with 

 prominent midribs and primary veins; petioles slender, compressed, 

 becoming glabrous, 5-8 cm. in length. Rachis of the staminate 

 inflorescence slightly villose, the pedicels pubescent; disk of the 

 flower puberulous toward the base, flowers otherwise as in the 

 species. Pistillate inflorescence 5-6 mm. long, the rachis, pedicels, 

 and slightly lobed disk of the flower densely villose, becoming 

 pubescent or glabrous on the fruit; ovary conic, pubescent, with 

 a short style, and stigmas divided into narrow divergent lobes. 

 Fruiting aments 8-9 cm. long, the fruit oblong-conical, pubescent 

 or glabrous, 5 mm. long; pedicels not more than i mm. in length. 



A tree 10-12 m. tall, with a trunk 30-40 cm. in diameter, stout spreading 

 branches forming a round topped head, stout, reddish brown pubescent or 

 puberulous branchlets often becoming glabrous during their first summer, and 

 acute tomentose pubescent or glabrous winter-buds. 



Borders of salt marshes on the coast of Vancouver Island, British Columbia, 

 near Sidney, J. Macoun, May 3. 1913 (staminate flowers), May 13, 1913 (pis- 

 tillate flowers), June 13, 1913, April 1914 (pistillate flowers), April 13, 1914 

 (fruit), May 6, 1914, C. 5. Sargent, July 27, 1913; by shingle mill near Sidney, 

 /. Macoun, April 2, 1913; old brickyard, Sidney, June 22, 1914; near Victoria, 

 British Columbia, Engelmann and Sargent, August 19, 1880, /. Macoun, 

 August 21, 1893 (no. 2131), May 27 and August 31, 1893 (no. 2232), May 28, 

 1908 (nos. 85714, 8805a), June 4, 1908 (no. 88059), May 5, 1915; Dead Man's 

 Creek, near Victoria, /. Macoun, July 23, 1908; Esquimo, Vancouver Island, 

 J. Macoun, June 23, 1887; Cape Laza, near Comox, Vancouver Island, 

 /. Macoun, July 7, 191 5. 



Extreme forms of this tree certainly appear distinct from P. tremuloides 

 Michaux and its western variety aiirea Daniels, but the shape of the leaves is 

 not constant ; the branchlets and the young leaves are sometimes glabrous or 

 nearly glabrous; on some branches the winter-buds are not tomentose but are 



