SALICACEAE. — POPULUS 23 



' Populus adenopoda Maximowicz in Bull. Soc. Nat. Mosc. LIV. 50 

 (1879). — Schneider, III. Handb. Lauhholzk. I. 20, in adnot. (1904). — 

 Dode in Mhri. Soc. Nat. Hist. Autun, XVIII. {Extr. Monog. Ined. 

 Populus, 34) (1905). — Gombocz in Math. Termesz. Kozl. XXX. 133 

 (Monog. Gen. Populi) (1908). — Leveill6, Fl. Kouy-Tcheou, 380 

 (1915). 



Populus tremula, var. adenopoda Burkill in Jour. Linn. Soc. XXVI. 537 (1899). 

 Populus Silvestrii Pampanini in Nuov. Giorn. Bot. Hal. n. ser. XVII. 247, fig. 

 2 (1910). 



Western Hupeh: north and south of Ichang, common, alt. 1300 

 m., March 11 and October 1907, March 23 and April 1908, March 

 1909 (No. 724; tree6-25m. tall, girth 0.5-1.8 m.); ChangyangHsien, 

 woodlands, alt. 1000-2300 m., May and June 1907 (Nos. 1400, 1437; 

 tree 6-20 m. tall, girth 0.75-1.5 m.); Hsing-shan Hsien, uplands, alt. 

 1600-2500 m. (Plant No. 1460; tree up to 20 m. tall; young plants 

 in the Arnold Arboretum) ; Fang Hsien, woods, alt. 2500-3400 m. 

 (Plant No. 4440; tree 13-20 m. tall, girth 0.9-1.5 m.; young plants 

 in the Arnold Arboretum); without exact locality, April 1900 (Veitch 

 Exped. No. 7); without locality, A. Henry (Nos. 5281, 5281»). 

 Northern Hupeh: " Kao-kien-scian," alt. 800 m., May-June 1907, 

 C. Silvestri (Nos. 296'' and 296, ex Pampanini); '*Sce-kio-ho," alt. 

 600, April 15-20, 1906, C. Silvestri (No. 378, ex Pampanini, type of 

 P. Silvestri); " Monte Triora," alt. 1950 m., July 3, 1907, P. C. Sil- 

 vestrii (No. 297, ex Pampanini); " ab urbe Hankan boream versus, in 

 Yun-yan Fu," March, P. J. Piasezki (staminate flowers, ex Maximo- 

 wicz). Western Szech'uan : southeast of Tachien-lu, alt. 2300 m., 

 October 1908 (No. 1430; tree 5-10 m. tall, girth 0.75-1.25 m.); 

 Mupin, alt. 1300-2000 m., woodlands, October 1907 (No. 1400'*; tree 

 12-18 m. tall, girth 0.75-1.25 m.). Kweichou : "Cy-Po," February 

 1900, J. Cavalerie (ex L^veille). Kiangsi: Kiukiang, alt. 300 m., 

 foothill, not common, August 2, 1907 (No. 1738; tree 10 m. tall). 

 S h e n s i : " ad fl. Han," April, 1875, P. J. Piasezki (type, ex 

 Maximowicz). 



This is a very distinct species, easily recognized by the long-acuminate closely 

 crenate leaves of old mature trees. On vigorous young plants the leaves are not yet 

 distinctly acuminate and may resemble those of shoots of P. tremula Linnaeus or 

 of P. Sieboldii Miquel. The leaves are greenish beneath, while those of P. tremula, 

 var. Davidiana Schneider are distinctly glaucous. 



This is the common low-level Poplar of Hupeh and Szech'uan and the more east- 

 ern parts of the Yangtsze valley. In western Hupeh it is very abundant in open 



