1652

ARBORETUM AND FRUTICETUM.

PART III

ing more from P. tr^muia than either of the last three sorts described,still we are very much inclined to think that it is a variety of that species;though we do not feel sufficiently sure to venture to indicate this even inparentheses. The trees in the Horticultural Society’s Garden were, in 1831,from 25 ft. to 30 ft. high, after being ten years planted. The P. grre'cais very subject to the attacks of the poplar hawk moth (Smerinthus populi),the puss moth (Certira vinula), and sometimes to that of other less commonPhalae'nidae. (See Mag. Nat. Hist., vol. v. p. 48.) Price of plants, in theLondon nurseries, Is. each; and at Bollwyller, 1 franc.

Statistics. In England, in Surrey, at Bagshot Park, 16 years planted, it is 3 > ft. high ; in Durham,at Southend, 12 years planted, it is 35 ft, high ; in Monmouthshire, at Woodfield, 10 years planted,it is 35 ft. high ; in Rutlandshire, at Belvoir Castle, 18 years planted, it is 30 ft. high, the diameter erf 1the trunk 8 in., and of the head 24 ft.; in Suffolk, in the Bury Botanic Garden, 12 years planted,it is 30ft. high, the diameter of the trunk 9 in., and of the head 16 ft.; in Worcestershire, at Croome,40 years planted, it is 60 ft. high. In Scotland, in Perthshire, in Messrs. Dickson and Turnbull’sNursery, Perth, 15 years planted, it is 20 ft. high. In Ireland, near Dublin, in the Glasnevin BotanicGarden, 20 years planted, it is 30 ft. high. In Saxony, at Worlitz, 30 years old, it is 30 ft. high, thediameter of the trunk 1ft. In Prussia, at Berlin, in the Botanic Garden,10 years planted, itis 20 ft. high, the diameter of the trunk 6 in., and of the head 4 ft.

7. P. ni'gra L. The black-£arA?</, or common black , Poplar.

Identification. Lin. Sp. PI., 1464.; Pall. FI. boss., 1. p. 66. ; Willd. Arb., 229.; Sp. PI., 4. p. 804.;Spveng. Syst. Vcg., 2. p. 244.; Ait. Hort. Kew., ed. 2.,5. p. 396.; Du Roi Harbk., 2. p. 139.; IlaiiSvn., 446.; Mill. Diet., No. 3. j Smith Eng. Bot., t. 1910.; Eng. FI., 4. p. 245.: Hook. FI. Scot.,289.; Mackay FI. Hibern., pt. 1. p. 251.

Synonymes. P., No. 1632., Hall. Hist., 2. p. 302.; P. alba Trag. Hist., 1080. fig.; P. vimfnea DuHam. Arh.\ Aigeiros, Greek ; Kabaki, Modem Greek ; the old English Poplar, Suffolk ; the WillowPoplar, Cambridgeshire ; Water Poplar; the female of P. nigra is called the Cotton Tree atBury St.,Edmunds ; Peupiier noir, Peuplier liard, Osier blanc, Fr. ; schwarze Pappcl, Ger.

The Sexes. Both are described in the Eng. Flora. Numerous male plants of P. nigra grow on theeast confines of Bury St. Edmunds, beside the river Lark, of which that figured in Strutt’s Sylva(our fig. 1514.) is one. In the male, Smith states that the stamens are “ eight, rarely more withus, though Linna»us and Leers describe 16.” A female plant of P. nigra stood, in 1829, on HardwickeHeath, near Bury St. Edmunds, beside the pond; and it is said another female plant grows uponthe same estate.

Engravings. Ping. Bot., 1.1910.; Ger. Em., I486., fig.; and others, quoted in Eng. Flora \ T. Neesab Esenbeck Gen. PI. FI. Germ.; our fig. 1513.; and the plate of this species in our last Volume..

Spec. Char., $c. Petiole somewhat compressed. Disk of leaf deltoid, pointed,serrated with glanded teeth, glabrous on both surfaces. Catkins lax,cylindrical. Stigmas 4, simple, spreading. ( Smith and Sprengel.) A tree,from 50 ft. to 80 ft. high ; a native of Europe, from Sweden to Italy, onthe banks of rivers, and in moist woods; and found, also, in the northof Africa; flowering in Britain in March and April.

Varieties.

'it P. n. 2 viridis Lindi.; P. viridis, Lodd. Cat., ed. 1836; has the leavesof a brighter green than the species. It was brought into noticeby a nurseryman of the name of Nurse, of Bealings, near Woodbridge,in Suffolk, about 1816, or before. There is a plant in the LondonHorticultural Society’s Garden, and one in the Botanic Garden ofBury St. Edmunds, and it is propagated in several nurseries.t P. n. 3 salicifo/ia; P. «vlicifolia Lodd. Cat., ed. 1836 ; has long narrowleaves, not unlike those of Nalix viminalis. Introduced from theFloetbeck Nursery in 1834.

Description. A tree of the largest size, with an ample head, composed'of nu-merous branches and terminal shoots. The bark is ash-coloured, and becomesrough and deeply furrowed with age. The roots, though they run along thesurface, go deeper into the soil than those of either P. alba or P. tremula,and do not produce suckers, though the contrary is affirmed by Miller. Thebranches are whitish ; and the branchlets are rarely hairy, but are more robustthan those of P. monilifera, which are glabrous. The leaves are slightlynotched on their edges, of a pale light green ; and the petioles are yellowish.The leaves are protruded about the middle of May, much later than those of P.fastigiiita, P. alba, or P. (a.) canescens ; and, when they are first expanded,their colour appears a mixture of red and yellow. The catkins are shorterthan those of P. tremula or P. ;ilba; they appear before the leaves, in Marchand April; those of the males are of a dark red, and, being produced in