154 AMENTACE.E. [Populus. 



Jcem. ovarils ovato-globosis stigniatis lobis maximis. PL Am. 2. /?. 619, Rich, App. p, 38, 

 PalL Eoss. l.t 41. 7r€W, Eliret. t 46.— a. pedunculo fcem. pubescente, florum pedicellis 

 vix perianthii glabri longitudine, foliis? — /3. pedunculo fcem. glabro, pedicellis pistillo 

 longioribus, foliis cordatis acumiuatil basi iruncatis. — y. amends ubique (etiam ovariis) 

 pubescenti-tomentosis, floribus fsessilibus, foliis exacte cordatis acuminatis.— an species 

 distincta? 



Hab. Canada. Mrs Sheppard. Througliout ' the woody country to the Great Slave Lake, and the south 

 branch of the Mackenzie River, called lUvicre aux Liards, from the great quantity of this tree which grows 

 there. It constituted the greater part of the drift timber observed on the shores of the Arctic Sea. Dr 



Richardson,— (^. Newfoundland. Miss Breiiton §. Banks of streams, N.W. America, attaining to a very 



large size, 60-140 feet high, and 9-20 feet in diameter. Douglas,— "Vha trees in general, I fear, and the 

 Poplars in particular, have not received tliat degree of attention that they deserve from the writers on 

 American Botany. The leaves are very liable to vary, and it is remarkably the case with this species, as 

 may be seen by the figures of Trew and Pallas ; but they are never white on the underside, as described by 

 Willdenow, &c. The flowers, too, are liable to vary, if I am correct in referring my two varieties to^ the 

 present species. The y., from the Pacific side of America, will probably prove a distinct species; but I 

 possess only one- specimen, and that with nearly perlcct fruit: the amentum is a span long, and the capsules 

 as large as pease, all over downy, and they are quite sessile. The leaves and flowers, both of /3. and y., are 

 very similar in form to those of P. monilifera, but the toothing and under surface are considerably diff'erent. 

 My specimens of P. bahamifera, from Kamtschatka, have the foliage orbicular, with scarcely any acumen. — 

 Dr Richardson observes that the trunk of this attains a greater circumference than that of any other tree in 

 the northern parts of America, "* 



2. P. cmidicans (Ait.); foliis cordatis acuminatis subtus albidis subtriplinerviis, stipulis 

 resinosis ramis teretibus. AiL Hort Kew. ed. 1. v. S, p. 406. Ph. Am. 2. p. 618. 



r 



Hab. Canada. Dr Hope, (Ait.)—0^ this species I am ignorant, and Willdenow, Pursh, and Michaux, 

 have added nothing to the brief character given by Alton, Indeed Michaux's figure and description, in the 

 iV. Aynerican Si/Iva, are alike unsatisfactory on the subject of the Poplars. From Dr Schweinitz I have 

 received the following species, under the name of P. candicans. May they not in reality be one and the 

 same ? 



r 



3. P. grandidentata (Mich.); ramis teretibus, petiolis superne compressis, foliis rotun- 

 dato-ovatis vix acuminatis grosse irregulariter seu angulato-dentatis basi saepe biglandu- 

 losis glabris junioribus densissime cano-tomentosis, amentis foemineis longis laxis, ovariis 

 lanceolatis, stigmaiis lobis linearibus. Mx, Am. 2. p. 243. N. Am. Sylv. p. 243. t. 99./. 2. 

 (good as to the fully formed' leaf). 



Hab. Canada. PA. Mrs Sheppard. Lake Huron. Dr Todd. New Brunswick. Mr Kendal, — The 

 foliage puts on very diiferent appearances at different periods of its growth, the young leaves being clothed 

 with very dense white tomentum, and margined with rather small and nearly regular teeth ; as they advance 

 in age, the down disappears, and the teeth become very large, and irregular. 



4. P. tremuloides (Mx.) ; ramis teretibus, foliis parvulis suborbiculatis breviter acumi- 

 nulatis serrulatis ciliatis basi saepe biglandulosis, squamis masculinis pulcherime sericeis, 

 ovariis lanceolatis, stigmatis lobis linearibus. Mx. Am. 2, p. 243 (1803). N. Am. Sylv, 

 p. 242. t. 99. /. L— P, trepida. Willd. (1805).— PA. A^n. 2. p. 618. Rich, App. p. 38. 



Hab. Canada {Mx, Mrs Sheppard), as far as lat. 64°, Dr Richardson. Douglas. New Brunswick. 



