1774 The Trees of Great Britain and Ireland 



1 6. Populus marilandica, Bosc. Seep. 1828. 



A tree with irregular branches. Leaves early in unfolding, rhomboid, 

 cuneate at the base, tapering above into a long acuminate apex. A pistillate 

 tree ; stigmas variable, two, three, or four. 



17. Populus Henryana, Dode, See p. 1829. 



A tree with irregular branches. Leaves opening early, not tinged with 



red, ovate- triangular, cuneate at the broad base, and ending in a long 



acuminate apex. A staminate tree ; stamens thirty to thirty-five. Flower 



buds pubescent, 



* * Branchlets pubescent. 



18. Populus robusta, Schneider. See p. 1829. 



Branchlets grey. Leaves unfolding early with a deep red tint, variable in 

 shape, ovate-deltoid or rhomboid ; cuneate, rounded, or truncate at the base ; 

 acuminate at the apex ; petioles pubescent. A staminate tree ; stamens twenty. 



19. Populus Lloydii, Henry, See p, 1830, 



Branchlets yellow. Leaves similar to those of P. robusta, but smaller ; 

 petioles pubescent, A pistillate tree ; stigmas usually two. 



IV. Tacamahaca, Spach, in Ann. Sci. Nat. xv. 32 (1841). 



Balsam poplars. — Trees with rough furrowed bark, and fragrant foliage. 

 Buds very viscid, exhaling a strong balsamic odour. Leaves whitish beneath, 

 without a clearly defined translucent cartilaginous border ; petioles rounded or 

 quadrangular, channelled on their upper side, 



A. Branchlets rounded, without projecting ribs, except occasionally on vigorous shoots 

 of young trees. 



* Branchlets and petioles pubescent. 



20. Populus candicans, Aiton. North America, See p. 1834. 



Leaves broad, ovate-deltoid, palminerved and cordate at the base, 5 to 6 in, 

 long, 4 in. wide, ciliate in margin. 



21. Populus tristis, Fischer, Himalayas (.?), Seep, 1840. 



Leaves narrow, ovate, palminerved and cordate or rounded at the base, 

 4 in. long, 2 in, wide, ciliate in margin, 



22. Populus Maximowiczii, Henry, Japan, Amurland, Manchuria, Korea. See 



p, 1838, 

 Leaves nearly orbicular, oval, or elliptic; palminerved and subcordate at 

 the rounded base ; 4 in. long, 3 to 3^ in, wide ; densely ciliate in margin, and 

 pubescent on the midrib, nerves, and veinlets of both surfaces. 



23. Populus suaveolens, Fischer, Siberia, Mongolia, Seep. 1841. 



Leaves ovate or ovate-lanceolate, palminerved and rounded at the base, 

 abruptly contracted into an acuminate apex, 3 to 3^ in. long, i|- to 2 in. broad ; 

 margin ciliate ; glabrous on both surfaces, 



* * Branchlets and petioles glabrous. 



24. Populus balsamifera, Linnaeus, North America. See p. 1832, 



Leaves ovate, palminerved and rounded at the base, 4 to 5 in, long, 2 to 3 

 in. wide, sparsely and minutely ciliate in margin. 



