SALICACEAE. — POPULUS 25 



This is a common tree on the higher mountains of Hupch and Szcch'uan, where it 

 covers extensive areas and often torms pure stands. It is always a slender tree, 

 rarely exceeding 20 m. in height with thin branches forming a loose and rounded 

 to oval crown. The bark is smooth greenish to pale gray except on very old trees 

 where it is dark gray and fissured on the lower part of the trunk. The young leaves 

 are reddish-purple and very beautiful as they unfold, and the habit of the tree is 

 light and attractive. It produces suckers very freely, like its Japanese relative 

 P. Sieboldii Miquel. Pictures of this tree will be found under Nos. 087, 088 of 

 my collection of photographs. E. H. W. 



Populus tremula, var. Davidiana, f . tomentella Schneider, n. forma. - R ^fcv»v^ 

 A typo glabro v. tantum initio sparse pubescente recedit ramulis 



hornotinis foliisque adultis plus minusve distincte pubescentibus v. 



tomentellis. 



Western Szech'uan: Mupin, forests, alt. 2300-3000 m., October 



1910 (No. 4359; trees 20-24 m. tall, trunk 1.25-2 m. in girth). 



This pubescent form of var. Davidiana seems to be analogous to f. pubescens 

 of var. typica of P. tremula, or it may even have the same systematic value as var. 

 villosa Lang (see Schneider, III. Handb. Laubholzk. I. 19 [1904]). 



This pubescent form is common in western Szech'uan, but is very rare in western 

 Hupeh. The leaves are usually larger than those of the type. E. H. W. 



Populus rotundifolia Griffith, var. Duclouxiana Gombocz in Math. ^ PXte-v*^ 

 Termesz. Kdzl XXX. 130 {Monog. Gen. Populi) (1908). ,...'....... -,. 



Populus macranthela L^veille & Vaniot in Bull. Soc. Bot. France, LII. 142'^ 'p- 



(March 1905); in Monde Plant. Xll. 9 (1910); in Fedde, Rep. Spec. Nov. ' . ^^ 

 Vlll. 446 (1910). — Gombocz in Math. Termesz. Kdzl. XXX. 157 {Monog. <I^< 



Gen. Populi) (1908). ^* 



Populus Duclouxiana Dode in Mem. Soc. Nat. Hist. Autun, XVIII. (Extr. 

 Monog. InM. Populus, 32, t. 11, fig. 34'') (1905). 



Populus rotundifolia Griffith, var. macranthela Gombocz in Bot. Kdzl. X. 25 

 et (7) (1910). — L6veill6, Fl. Kouy-Tcheou, 380 (1915). y^ 



^ 



Western Szech'uan : Ching-chi Hsien, Fei-yueh-ling, woods, alt. 

 2-3000 m.. May 1908 (No. 1432; tree 12-20 m. tall, girth 0.75-1.25 m.). 

 Kweichau: Pin-Fa, April 1, 1903, J. Cavalerie (No. 974, type of 

 P. macranthela, ex Ldveille, 1905). Yunnan: without locality, F. 

 Ducloux (ex Dode, type of P. Duclouxiana). 



I have seen neither the type of Ij(5veill6'8 nor of Dode's species, but Gombocz 

 says, 1. c. (1911) of P. macranthela: " D'apresles 6chantillons originaux elle est trSs 

 voisine k la P. rotundifolia Griff, et ne differe de la demiere que par ses chdtons 

 plus longs (15-24 cm.) et par ses capsules ii pedicelles plus longs. Elle pent done 

 etre identifi6 avec la P. Duclouxiana (distingu6e par Dode), qui a d'aillcurs la 

 meme repartition : China, Yunnan." I am not quite sure if Wilson's specimens really 

 represent the same form. They may be described as follows: 



O. H. HILL LIBRARY 



North Carolina SUte ColiQ«e 



