SALICACEAE. — POPULUS 25 
This is a common tree on the higher mountains of Hupeh and Szech’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. lt produces suckers very freely, like its Japanese relative 
P. Sieboldit Miquel. Pictures of this tree will be found under Nos. 087, 088 of 
my collection of photographs. E. HW. 
Populus tremula, var. Davidiana, f. tomentella Schneider, n. forma. 
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, Ill. Handb. Laubholzk. Y. 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. 
Termesz. Kózl. XXX. 130 (Monog. Gen. Populi) (1908). 
Populus macranthela Léveillé & Vaniot in Bull. Soc. Bot. France, LII. 142 
(March 1905); in Monde Plant. X11. 9 (1910); in Fedde, Rep. Spec. Nov. 
V11I. 446 (1910). — Gombocz in Math. Termesz. Közl. XXX. 157 (Monog. 
Gen. Populi) (1908). 
Populus Duclouxiana Dode in Mem. Soc. Nat. Hist. Autun, XVIII. (Eztr. 
Monog. Inéd. Populus, 32, t. 11, fig. 34*) (1905). 
Populus rotundifolia Griffith, var. macranthela Gombocz in Bot. Közl. X. 25 
et (7) (1910). — Léveillé, Fl. Kouy-Tchéou, 380 (1915). 
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 Léveillé, 1905). Yunnan: without locality, F. 
Duclouz (ex Dode, type of P. Duclouxiana). 
I have seen neither the type of Léveillé’s nor of Dode's species, but Gombocz 
says, l. c. (1911) of P. macranthela: “ D’après les échantillons originaux elle est trés 
voisine à la P. rotundifolia Griff. et ne diffère de la dernière que par ses chátons 
plus longs (15-24 em.) et par ses capsules à pedicelles plus longs. Elle peut donc 
être identifié avec la P. Duclouziana (distinguée par Dode), qui a d'ailleurs la 
méme répartition: China, Yunnan.” I am not quite sure if Wilson's specimens really 
represent the same form. They may be described as follows: 
