1794 ^he Trees of Great Britain and Ireland 



from America may be a cross between P- tremuloides and P. grandidentata} It 

 appears to have been first mentioned by Simon- Louis '^ in 1869. Koch' speaks 

 of it as a pendulous tree existing in England in 1872. There are good specimens at 

 Abbotsbury and at Glasnevin. (A. H.) 



POPULUS SIEBOLDII 



Populus Sieboldii, Miquel, in Ann. Mus. Bot. Lugd. Bat. {exd. pi. masc.*) iii. 29 (1867); Wesmael, 



in De Candolle, Prod. xvi. 2, p. 327 (in part) (1864) ; Schneider, Laubholzkutide, i. 17 (1904); 



Dode, in Mim. Soc. Hist. Nat. Autun, xviii. 32 (1905); Gombocz, in Math. Termes. Kdzl. xxx. 



131 (1911). 

 Populus tremula, Linnaeus, van villosa, Franchet and Savatier, Enum. PI. Jap. i. 465 (1875) (not 



Wesmael); Maximowicz,* in Bull. Soc. Nat. Mosc. liv. 49 (1879); Shirasawa, Icon. Ess. For 



Japan, i. text 37, t. 18, figs, i-io (1900). 

 Populus rotundifolia, Simon-Louis, ex Dippel, Laubholzkunde, ii. 192 (1892). 



A tree, attaining in Japan 60 ft. in height. Young branchlets stout, covered in 

 spring with a dense white tomentum, persistent in part during summer. Buds more 

 or less tomentose, not viscid. Leaves (Plate 408, Fig. 6) thicker in texture than 

 those of P. tremula, densely tomentose and ciliate when young, glabrescent in 

 summer, dark shining green above and yellowish or pale beneath, about 3 in. long 

 and 2 in. broad, ovate, rounded or cuneate at the base, abruptly contracted into a 

 glandular short acuminate apex ; margin with a translucent border, minutely 

 (varying even on the same leaf) sinuately toothed or glandular serrate ; basal glands 

 usually well developed ; petiole slender, pubescent, laterally compressed. Flowers 

 similar to those of P. tremula, but with the disc slightly pubescent. 



This species, which is very distinct in appearance from the common aspen, 

 appears to be confined to Japan, where it was collected at Aomori by Elwes. 



It appears to have been introduced by Simon-Louis about 1887, but the only 

 tree which I have seen is a grafted one at Glasnevin, planted in that year, which has 

 only attained a height of 15 ft. and is not very thriving. (A. H.) 



POPULUS FREMONTII 



Populus Fremontii, Watson, in Proc. Am. Acad. x. 350 (1875); Sargent, Silva N. Amer. ix. 183, 

 t. 496 (1896), and Trees N Amer. 164 (1905); Dode, in Mim. Soc. Hist. Nat. Autun, xviii. 

 40 (1905); Gombocz, in Math. Termes. Kdzl. xxx. 76 (191 1). 



Populus monilifera, Torrey, in Siigreave's Pep. 172 (1853) (not Aiton). 



A tree, attaining 100 ft. in height and 15 ft. in girth; bark at first smooth and 

 thin, ultimately becoming on old trunks deeply fissured into broad rounded scaly 



1 Nuttall, Gen. PI. ii. 239 (1818), describes as P. grandidentata, var. pendula, u tree "with pendulous branches, 

 as in the weeping ash, on the Alleghany Ridge, Pennsylvania, rare." Loudon, op. cit. 1651, states that there was a tree 

 bearing this name in the Horticultural Society's garden in 1838 ; but that its branchlets were not pendulous. There is, there- 

 fore, no evidence that Nuttall's tree, seen only in the wild state, was ever introduced into cultivation. 



2 Cat. Giniral, 1869, p. 73, where it is called P. grandidentata, var. pendula, and is described as a weeping form with 

 large teeth to the leaves. 3 Dendrologie, ii. pt. i. 488 (1872). 



< The staminate specimen described by Miquel, which is preserved in the Leyden Herbarium, is a species of Cartinus 

 according to Maximowicz. 



