SALICACEAE. — POPULUS 37 



According to Hooker f., Stewart and others the Lombardy Poplar is cultivated 

 here and there in the northwestern Himalaya and western Tibet. To this form be- 

 longs a specimen in the Gray Herbarium with the label: Populus bahamifera, Herb. 

 Falconer No. 957. 



The typical P. nigra Linnaeus Spec. 1034 (1753) (P. nigra, var. typica Beck, 

 Fl. Nied.-Oestr. 303 [1890]). — P. europaea Dode in Mem. Soc. Nat. Hist. Autun, 

 XVIIl [Extr. Monog. Ined. Populus, 51, t. 12, fig. 78] [1905] [non P. nigra Dode]) 

 appears to find the eastern limits of its range in the Altai region. 



Of the very doubtful P. nigra, var. sinensis Carriere, I have seen only a culti- 

 vated plant distributed by Dode and supposed to have come from the type plant. 

 I do not know how to distinguish this cultivated plant from the Lombardy Poplar. 



The Lombardy Poplar has been introduced into China by foreigners and is cul- 

 tivated especially in many of the treaty ports, including that of Ichang. It has also 

 been introduced and is now cultivated in Tokyo and other parts of Japan. 



If the obscure P. nigra, var. sinensis Carriere, really came from China, and is 

 really referable to P. nigra Linnaeus, the specimen was probably taken from a cul- 

 tivated plant of the Lombardy Poplar. I do not believe that P. nigra Linnaeus or 

 any of its forms grows spontaneously in China. E. H. W. 



Sect. 5. LEUCE Duby in De CandoUe, Bot. Gall. I. 427 (1828). — Gombocz in 

 Math. Termesz. Kdzl. XXX. 137 {Monog. Gen. Populi) (1908). 



Populus, subgen. Leuce Dode, Mem. Soc. Hist. Nat. Autun, XVIII. (Extr. 

 Monog. Ined. Populus, 13) (1905). 



Folia ramulorum turionumque saepe satis diversa, subtus pleraque discoloria, 

 superne haud stomatifera, basi saepe v. haud glaudulifera; petioh plus minusve 

 compressi v. foUorum turionaUum plus minusve cylindrici, semper satis longi. 

 Gemmae haud v. vix viscosae. Disci florum persistentes, sinuati; stigmata pleraque 

 2, sessiha; stamina 5-20, subglobosa v. elongata, non apiculata. Capsulae satis 

 parvae, elongatae. 



16. Populus alba Linnaeus, Spec. 1034 (1753). — Ledebour, Fl. Alt. IV. 295 

 (1833). — Stewart, Punjab PI. 203 (1869). — Hooker f., Fl. Brit. Ind. V. 638 

 (1888). — Brandis, Ind. Trees 640 (1906). — Gombocz in Math. Termesz. Kdzl. 

 XXX. 141 {Monog. Gen. Populi) (1908). 



Populus triloba Dode in Mem. Soc. Hist. Nat. Autun, XVIII. {Extr. Monog. 



Ined. Populus, 21, t. 11, fig. 5) (1905). 

 Populus Morisetiana Dode, 1. c. 22, t. 11, fig. 11 (1905). 



The species seems to be wild (and often planted) in the northwestern Himalaya, 

 Tibet and Altai. I have seen no specimens from those regions, and I do not know 

 if Dode's species may really indicate any distinct form. 



17. Populus tomentosa Carriere, in Rev. Hort. X. 340 (1867). — Wesmael in 

 De CandoUe, Prodr. XVI. 2, 325 (1868); in Mem. Soc. Set. Hainaut, III. 228 

 {Monog. Populus, 48, t. 17) (1869). — Schneider, III. Handb. Laubholzk. 1. 21, fig. 

 5 f-g2, 7 t-u (1904). — Dode in Mem. Soc. Nat. Hist. Autun, XVIII. {Extr. Monog. 

 Ined. Populus, 25, t. 11, fig. 21) (1905). — Ascherson & Graebner, Srjn. Mitteleur. 

 Fl. IV. 24 (1908). — Gombocz in Math. Termesz. Kozl. XXX. 140 {Monog. Gen. 

 Populi) (1908). — Henry in Elwes & Henry, Trees Gr. BrU. & Irel. VII. 1786, t. 

 408, fig. 2 (1913). 



Populus alba, var. denudata Maximowicz in Bull. Soc. N'at. Mosc. LIV. 48 

 (non Hartig) (1879). 



