Populus 1829 



POPULUS HENRYANA 



Populus Henryana, Dode, in Mem. Soc. Hist. Nat. Autun, xviii. 39 (1905). 



A large tree of hybrid origin, similar in bark to P. serotina, but differing 

 in habit, forming a wide-branching round-headed crown of foliage. Young branchlets 

 glabrous, becoming dull grey in the second year, with whitish raised lenticels. 

 Buds viscid, with slightly pubescent scales. Leaves (Plate 409, Fig. 18) opening 

 earlier than those of P. serotina, and not tinged with a bronzy red tint, ovate to 

 ovate-triangular, about 3 in. long and 2^ in. wide, truncate or slightly cuneate at the 

 broad base, ending above in a long acuminate apex ; serrations small, crenate, 

 numerous, with incurved points ; margin sparsely ciliate ; glands minute, usually two 

 present, occasionally absent ; petiole reddish, glabrous. Leaves on the short shoots 

 smaller, usually as broad as long, ovate, cuneate at the base. 



Flower buds with densely pubescent ciliate scales, very viscid. Staminate 

 catkins about i^ in. long ; axis glabrous ; scales deeply divided into irregular lobes 

 ending in long or short filaments ; disc glabrous ; stamens, thirty to thirty -five, 

 with white filaments and dull red anthers. 



This hybrid, which has peculiar pubescent buds, is of unknown origin and is 

 staminate. The only tree which we have seen is in the park in front of the house at 

 The Wilderness, White Knights, Reading. It measured in 1907 about 100 ft. by 

 14 ft., and was probably obtained as a young plant from France, where M. Dode^ 

 has observed trees of a similar kind. (A. H.) 



POPULUS ROBUSTA 



Populus robusta, Schneider, Laubholzkunde, i. 11 (1904); Dode, in Mint. Soc. Hist. Autun, xviii. 45 



(1905); Ascherson and Graebner, Syn. Mitteleurop. Fl. iv. 45 (1908). 

 Populus angulata cordata robusta, Simon-Louis, Catal. 61 (1899). 



A tree of hybrid origin remarkably vigorous in youth, with ascending branches. 

 Young branchlets angled, minutely pubescent ; on strong shoots, stout, grey with 

 white lenticels, and with projecting ribs as in P. angulata. Buds reddish brown, 

 viscid. Leaves (Plate 409, Fig. 20) unfolding early in the season with a deep red 

 tint,^ variable in shape, about 3 in. in length, ovate-deltoid or rhombic; cuneate, 

 rounded, or truncate and sub-cordate at the base ; acuminate at the apex ; serrations 

 coarse, with incurved tips, few and wide apart on the base ; margin with scattered 

 cilia ; glands one, two, or absent ; petiole reddish, with scattered short hairs. 



Staminate catkins, borne on a tree at Glasnevin, 2\ in. long ; flowers numerous, 

 crowded; axis glabrous; scales deeply and irregularly lobed, ending in long 



1 M. Dode tells me that there is a fine tree at Paris in the Champs de Mars, near the Eiffel Tower, which was planted 

 about 1888. There was an old tree, no longer living, in the Jardin de Luxembourg. He adds that the propagation by 

 cuttings of this poplar feils in the open air, but succeeds under glass. 



a As seen at Kew, it is the most beautiful of all the poplars when coming into leaf. 

 VII 2 A 



