Populus 1 8 1 1 



mature, slightly pubescent when young ; with two to six glands at the base of the 

 blade, irregular in shape and size, either on the petiole or on the adjoining 

 margin ; margin, with a narrow translucent border, ciliate, crenately glandular- 

 serrate, the teeth close together, except near the apex, where they are wanting, 

 and on the base, where they are coarser and wide apart ; petiole laterally compressed, 

 greenish, pubescent at first, glabrous later. 



Catkins, about 2 to 3 in. long ; scales small, cucullate or concave, dentate and 

 without long linear lobes ; axis and short pedicels glabrous. Stamens, thirty to 

 forty, on an oblique glabrous disc ; filaments slender, white ; anthers red. Ovary 

 sessile, globose, glabrous, in a deep five-lobed glabrous cup-shaped disc ; stigmas 

 three or four, yellowish, widely dilated, crenulate, often subdivided each into two 

 lobes, spreading upwards or horizontally outwards from the apex of the ovary. Fruit 

 not seen. 



The female tree of typical P. angulata, which is in cultivation in Europe, has 

 branchlets less winged than those of the staminate tree, and is often distinguished as 

 P. angulata cordata, though its leaves are as often truncate as cordate. At 

 Plantieres, Metz, it is said ' to be very hardy, as young trees bore without injury 

 a temperature of -23 Cent, in December 1859; whereas the staminate tree is 

 killed by a temperature of -12 to -15 Cent. The pistillate tree is represented 

 at Kew by a specimen about 35 ft. high, which was obtained from Simon-Louis in 

 1885. A similar tree at Glasnevin regularly bears flowers, which have been drawn 

 by Miss F. Wool ward. There is an old tree of this at Plantieres, which produced 2 

 fertile seed in i860, and was 7 ft. in girth 2 in 1905. 



1. Van missouriensis, Henry. This variety has branchlets and leaves similar to 

 those of typical P. angulata, but differs in the flowers, which are like those of 

 P. monilifera. The scales of the flowers of both sexes are large, laciniate and 

 fimbriate ; while the stamens are 40 to 60, as in the latter species. 



Var. missouriensis, judging from specimens in the Kew Herbarium, which 

 agree with those sent to me by Rehder from North Bend on the Ohio river, appears 

 to be the ordinary wild form of P. angulata in the Mississippi basin. This 

 variety is in cultivation 3 in the south of France and in Italy; but requires further 

 study. 



Typical P. angulata has not yet been identified, so far as I know, in the United 

 States ; and is possibly a form with peculiar flowers, in which the scales have become 

 modified, that has arisen in cultivation in the cooler climate of western Europe. It 

 may, however, yet be found wild in the Carolinas or in Virginia, whence P. angulata 

 is reputed to have been originally introduced into Europe. (A. H.) 



1 Thomas, in Rev. Hort. 1861, p. 75. It is called P. cordata, by Simon-Louis, Cat. Gen. 1869, p. 72, where it is said 

 to have been a long time in their nurseries, and to be of unknown origin. 



2 Letter to Kew from Jouin. Its leaves appear earlier than those of the European poplars, and were opening on 15th 

 April 1911, and were fully out on 6th May 191 1 ; whilst those of P. serotina do not come out at Metz till late in May, as 

 M. Jouin told me. H. J. E. 



3 Specimens with staminate flowers collected by Elwes in the Borilly Park at Marseilles, and others of both sexes sent 

 to me from Turin by Prof. Voglino, belong to var. missouriensis. Possibly all the trees in cultivation in the south of France 

 and in Italy belong to this variety ; but I see no means of distinction in the absence of flowers. The habit of these southern 

 trees is scarcely distinct. 



