210 POPULUS 



detailed description, such as PETROWSKYANA, Schroeder ; RASUMOWSKYANA, 

 Schroeder ; and WOBSTII, Schroeder all of Russian origin. The two first 

 are hybrids between some black poplar and laurifolia and suaveolens 

 respectively ; Wobstii is thought to be between tristis and laurifolia. 



Poplars do not produce good seed freely as a rule, and one does not 

 often see seedling plants of the majority. All of those worth cultivating 

 thrive best in a good moist loam, but many (of the black poplar group 

 especially) also succeed well in heavy, wet ground, and are valuable on 

 that account. 



P. ALBA, Linnceus. WHITE POPLAR. 



A tree said to be 90 to 100 ft. high, but I have seen none more than halt 

 that size in this country ; bark of trunk smooth ; young shoots and lower 

 surface of the leaves covered with a thick, vividly white wool, which on 

 the lobed leaves persists and keeps white until the fall of the leaf. Leaves 

 variable ; rounded to slightly heart-shaped at the base, blunt-pointed ; 

 on short twigs they are broadly ovate or almost round, irregularly wavy 

 at the margins, I to 2 ins. long ; on vigorous shoots and young trees 

 they are much larger, usually of maple-like form, being deeply three- or 

 five-lobed and from ij to 5 ins. long, each lobe with a few large teeth. 

 When the leaves first expand they are covered above with a loose white 

 floss which falls away during the summer, leaving the upper surface very 

 dark green and smooth j stalk | to \\ ins. long, woolly. Male catkins about 

 I in. long. 



Native of Europe, but not, as is usually believed, of Britain, where it is 

 much confused with P. canescens. The true white poplar is not particularly 

 common, and all the trees I have seen are comparatively small. Large trees 

 so called are invariably P. canescens. In gardens it is called "P. alba var. 

 nivea," and " P. Arembergiana," to distinguish it from P. canescens figuring 

 as P. alba. The true P. alba is easily recognised by the leaves, especially 

 the lobed ones, remaining white and woolly beneath until they fall, and by theii 

 being palmately lobed on vigorous shoots. The foliage sometimes turns 

 a fiery red in autumn. 



Var. GLOBOSA, Spath. A dwarf form making a rounded, bushy head. 

 Leaves of the rounded form, with slightly lobed or undulated margins. 

 Very slow-growing. 



Var. PYRAMIDALIS, Bunge (P. Bolleana, Carriere). Bolle's Poplar. A 

 slender pyramidal tree of great beauty, resembling the Lombardy poplar 

 in habit, but wider in proportion to its height, and distinguishable in winter 

 by its pale smooth trunk. There is a fine specimen about 70 ft. high near 

 the Sun Temple at Kew. Seen in a breeze, this tree has an enlivening effect, 

 caused by swift flashes of white when the under-surface of the leaf is 

 revealed. According to a statement in the Garden for Dec. 10, 1887, p. 543, 

 it was originally found in September, 1841, forming a little grove on the 

 north side of the Karataw mountains, between Bokhara and Samarcand, 

 and apparently wild. It was introduced to W. Europe between 1875 and 

 1878. 



Var. RICHARDII. In this form the upper surface of the leaf is a dull 

 golden yellow, the under-side and the young shoots felted with white wool 

 as in the type. First shown at the International Exhibition, Chelsea, 1912. 



P. ANGULATA, Aiton. CAROLINA POPLAR. 



A -large tree whose angular or ribbed young shoots are without down, but 

 marked by long, narrow, pale lenticels. Leaves heart-shaped (sometimes 



