804 



PB ACTIO AL GUIDE TO GABDEN PLANTS populus 



from the type by its smaller rarely lobed 

 leaves covered with a greyish down. 



Culture Sc. as above. P. alba makes 

 a fine shelter tree. Increased by suckers, 

 shoot and root cuttings, and layers. 



P. balsamifera (Balsam Poplar; 

 Balm of Oilead ; Tacaniahac) . — A fine N. 

 American tree with roimd branches and 

 large buds copiously coated with a fragrant 

 resin. Leaves quite smooth, ovate, ser- 

 rate, tapering to a fine point, whitish and 

 reticulated beneath. The variety cantJiccwts 

 (P. ontariensis), known as the Ontario 

 Poplar, has broader and more or less 

 heart-shaped serrate pointed leaves on 

 usually hairy stalks, and grows 40-50 ft. 

 high in this country. As its branches are 

 remarkably brittle and easily broken by 

 the wind, it should not be planted where 

 exposed to strong gales ; laurifolia, a 

 Siberian tree, has oval oblong tapering 

 toothed leaves ; and suaveolens from the 

 Eooky Mountains has broadly elliptic 

 taper-pointed toothed leaves with slightly 

 downy nerves and stalks. 



Culture dc. as above. 



P. deltoidea (P. monilifera ; P. cana- 

 densis). — Necklace or Carolina Poplar. — 

 An ornamental tree from N. America 

 80 ft. high or more, having sharply angled 

 or winged branches, and remarkable for its 

 large ovate heart-shaped or deltoid entire 

 or bluntly serrate smooth and bright green 

 leaves 6-9 in. long on young plants and 

 suckers, but smaller on folly grown trees. 

 The variety aurea is readily distinguished 

 by the golden-yellow colour of the foliage. 



Culture dc. as above. 



P. grandidentata. — This species attains 

 a height of 60 ft. or more in a wild state in 

 N.America. It has roundish branches and 

 downy, not resinous, buds. Leaves 1-3 in. 

 long, roundish ovate, vsdth large and irre- 

 gular sinuate teeth, smooth on both sides 

 when old, but densely covered with a white 

 silky wood when young. The weeping 

 variety called pendula is the one mostly 

 seen. 



Culture dc. as above. 



P. nigra (BlacTc Poplar). — A quick- 

 growing tree, 50-60 ft. high, native of 

 Europe and N. Asia, with smooth greenish- 

 white branches, downy when yoimg and 

 more or less resinous, like the buds. 

 Leaves 1-4 in. long, rhomboid deltoid or 

 roundish, finely crenate serrate, with 

 round angles, and a tapering apex, borne 

 on slender flattened stalks. The variety 

 saUcifolia has narrow WUlow-like leaves. 



The Lombardy Poplar is a variety of 

 the Black Poplar, and is recognised by 

 its pyramidal Cypress-like habit. It attains 

 a height of 100-150 ft., and is known 

 botanioaUy as P. nigra pyramidaUs 

 (P. d/ilatata and P. fastigiata being 

 synonyms). 



In the Botanic Garden at Dijon there 

 is, or was some years ago, a specimen of 

 the Black Poplar, said to be not less than 

 500 years old. It was over 130 ft. high, 

 and the trunk had a girth of 50 ft. at the 

 ground level. 



Culture dc. as above. 



P. tremula {Aspen) A beautiful native 



tree, rarely exceeding 50 ft. high, distin- 

 guished by its grey bark and remarkable 

 for the almost perpetual tremulous motion 

 of its roundish heart-shaped entire or 

 angidarly toothed leaves, which are 1-4 in. 

 long, smooth or silky beneath, and borne 

 on very long slender flattened stalks. 

 Flowers in March and April in cylindrical 

 catkins 2-3 in. long, the male flowers 

 having about 8 stamens. The variety 

 pendula has drooping branches, and is 

 usually grafted on tall stems of the 

 Common Aspen. 



Culture dc. as above. 



P. tremuloides (P. grceca) American 



Aspen. — A North American tree 20-50 ft. 

 high, with smooth branches "knd buds, 

 the latter being more or less clammy. 

 Leaves roundish heart-shaped, with a 

 short sharp point and small regular teeth, 

 and borne on slender flattened stalks. 

 There is also a weeping form of this 

 species. 



Culture dc. as above. 



ex. EMPETRACEiE— Crowberry Order 



A small order of Heath-like shrubs, v^ith alternate, scattered or clustered, 

 sniall linear or oblong, thickish leaves, no stipules, and small, 1-sexed or 

 polygamous flowers in axillary clusters or terminal heads. Perianth segments 

 4-6, somewhat petaloid, Etnd often in two rows. Stamens 2-3, very rarely 4. 

 Fruit a. roundish, fleshy drupe. 



