POPULUS 



POPULUS 



2755 



rustle with the lightest movement of air. The ripple of 

 its foliage recalls the play of wavelets on a pebbly 

 shore. The day is never so dark but the cottonwood 

 reflects a flood of light. One should take care, however, 

 to plant only the staminate tree, for the "cotton" of 

 the seeds is very disagreeable on lawns and about 

 dwellings when carried by the wind. In the plains and 

 mountain states, the western cottonwood (P. Sargentii) 

 is a characteristic tree. 



Some of the forms of the black poplar of Europe 

 are especially satisfactory for the production of lively 

 effects in planting. Of these, one of the most distinct is 

 the form known to nurserymen as Populus elegans. It has 

 a most pleasing light and tremulous foliage, the effect 

 of which is heightened by a twiggy character of growth 

 and a reddish cast to the leaf-stalks and young shoots. 

 It is an elegant tree, and well adapted to planting in 

 front of heavier foliage in the most conspicuous part 

 of the grounds. 



Some of the silver- or white-leaved poplars produce 

 the most striking contrasts of foliage, especially if set 

 near darker trees. Bolles' poplar (Populus Botteana 

 of the nurseries) is one of the best of these trees. Its 

 habit is something like that of the Lombardy. The 

 upper surface of the deeply lobed leaves is dark dull 

 green, while the under surface is almost snowy white. 

 Such emphatic trees as this should usually be par- 

 tially obscured by planting them amongst other trees 

 so that they appear to mix with the other foliage, or else 

 they should be seen at some distance. Other varieties 



3127. Populus tremula. ( X J$) 



of the common white poplar or abele are frequently 

 useful, although most of them sprout badly and may 

 become a nuisance. The Lombardy poplar (P. nigra 

 var. italica) is probably the most striking and distinct 

 tree that is suited to planting in the North. As single 

 specimens scattered here and there in mixed plantings, 

 or when seen over or behind buildings, it may be most 

 picturesque and satisfactory; but the tendency is to 

 plant it too freely. The very fact that it is emphatic 

 is the reason why it should be planted sparingly when 

 artistic effects are desired. 



The catkins of poplars, particularly the staminate 

 ones, are usually attractive, as they appear in early 

 spring; but they are of short duration. Fig. 3130. 



The following sketch includes all the poplars known 

 to be offered by American nurserymen or to be subjects 

 of rather general planting, together with exotic forms 

 that are likely to appear in this country. For litera- 

 ture, see Wesmael, DC. Prodr. 16, pt. 2, pp. 323- 

 31; Sargent, Silva of North America, vol. 9 (quoted 

 below as S.S.). A very recent careful treatment of the 

 poplars appears in Volume VII of Elwes & Henry, 

 "Trees of Great Britain and Ireland;" from this work 

 some of the following characterization is drawn. 

 Subsequently, the black poplars (P. nigra-deltoides 

 group) have been worked over by Henry in Transactions 

 of the Royal Scottish Arboricultural Society, 30, pt. 1. 



Discussions of the genus of recent date will be found 

 in C. K. Schneider, "Handbuch der Laubholzkunde" 

 (1906) and Dode in Mdmoires Soci6t6 d' Histoire 

 Naturelle d'Autun (1905). For an account of the new 

 and old Chinese species, see Schneider in "Plantae 

 Wilsonianae," Vol. III. 



INDEX. 



acuminata, 19. euxylon, 146. pendula, 1, 2, 4, 5, 6. 



adenopoda, 4. Fargesii, 15. Petroswkyana, 28<i. 



afghanica, 8. fastigiata, 8. plantierensis, 8. 



alba, 1, 2, 3. fortissima, 18. pruinosa, 29. 



Andrewsii, 12a. Fremontii, 9, 10. Przewilskii, 24. 



angulata, 11, 13, 14. Freynii, 4. 



angulosa, 14 note. generosa, 140. 



angustifolia, 18. glabrata, 3. 



arembergiana, 1. globosa, 1. 



argentea, 1. grxca, 5, 6. 



ariana, 29. grandidentata, 5. 



atheniensis, 6. hastata, 17. 



aurea, 6, li. helvetica, 14a. 



Baileyana, 21. heterophylla, 16. 



balsamifera, 17, 20, Henryana, 14c. 



24, 25, 27. hudsonica, 8. 



berolinensis, 28a. hybrida, 2. 



Besseyana, 11. intermedia, 24. 



betulifolia, 8. italica, 8. 



Bogueana, 2. Jack!!, 21. 



pseudobalsa mi f era, 



28o. 

 pseudograndidentata, 



4. 5. 



pyramidalis. 1, 4, 8. 

 pyramidata. 8. 

 Rasumowskyana, 28c. 

 regenerate, I4e. 

 Richardii, 1. 

 robusta, I4d. 

 rotundifolia, 7. 

 salicifolia, 26. 

 Sargentii, 12. 

 serotina. 14a. 

 sibirica, 24. 



BoUeani, 1. lasiocarpa, 15. Sieboldii, 7. 



Brandegeei, 1. laurifoha, 24, 25, 26, Sihestrii, 4. 



brevifolia, 27. 27. Simonii, 27. 



canadensis, 14 note. Lindleyana, 26. sinensis, 8. 



candicans, 17, 20. Litwinowiana, 29. Steiniana, 2. 



canescens, 2, 8. Lloydii, 14/. suayeolens, 24. 



Carolina, 14 note. MacDougalii, 10. subintegerrima, 1. 



carolinensis, 14 note, macranthela, 7. szechuanica, 24. 



caroliniana, 14 note, macrophylla, 14 note, Tacamahaca, 20. 



cercidiphylla, 6. 20. thetestina, 8. 



certinensis, 28a. marilandica, 146. tomentosa, 3. 



charkowiensis, 8. Maximowiczii, 23. tremula, 4. 



ciliata, 17. megaleuce, 2. tremuloides, 6. 



colaradensis, 19. mexicana, 10. trichocarpa, 28. 



crispa, 26. Michauxii, 17. triloba, 1. 



Davidiana, 4. microcarpa, 7. tristis, 22. 



deltoidea, 11. missouriensis, 11, 14 Tweedyi, 19. 



deltoides, 11, 12. note. typica, 8. 



Denhardtiorum, 29. monilifera, 11, 12, Van Geertii, 11. 



denudafa, 3. 14 note. Viadri, 8. 



dilatata, 8. monlicola, 1. villosa, 4. 



diversifolia, 29. Morisetiana, 1. viminalit, 26. 



Duclouxiana, 7. nigra, 8. virginiana, 14 note. 



Dudleyi, 26. nivea, 1. vistulensis, 8. 



elegans 8. Nolestii, 28c. Wilsonii, 15. 



Eucalyptus, 14e. occidentalis, 12. Wislizenii, 10. 



Eugenei, 14. ontariensis, 20. Wobstii, 286. 



euphratica, 29. pekinensis, 3. yunnanensis, 24. 



For the purposes of this popular treatment, the 

 species of Populus may be thrown into six groups: 



I. The white poplars; Nos. 1-3. 

 II. The aspens; Nos. 4-7. 



III. The black poplars and cottonwoods; Nos. 8-14. 

 IV. The large-leaved poplars and cottonwoods; Nos. 



15, 16. 



V. The balsam poplars and tacamahacs; Nos. 17-28. 

 VI. The variable-leaved poplars; No. 29. 



I. WHITE POPLARS. Lvs. mostly strongly angled or 

 lobed and broader than ovate in shape, the mature 

 Ivs. on the long or verdurous shoots usually white- 

 tomentose or gray-canescent beneath (at least in the 

 cult, forms), Ivs. on the short or small shoots often 

 becoming glabrous or nearly so and often of different 

 shape from those on the strong-growing shoote; 

 petiole usually cylindrical: terminal buds relatively 

 small and not glutinous. 



1. alba, Linn. (P. triloba and P. Morisetiana, Dode). 

 WHITE POPLAR. ABELE. Large much-branched tree, 

 with whitish bark on the young branches becoming 

 dark-colored and rough on the mature parts: Ivs. 

 much like those of P. grandidentata in form, but 

 smaller, usually thicker and more angular, the under 

 surface especially early in the season woolly white, 

 in shape from broadly ovate to orbicular, irregularly 

 short-lobed or sinuate, short-truncate or somewhat 

 cordate at base: catkins short (mostly about 2 in. long, 

 the males longer), sessile, with thin dentate or erose 

 scales; stamens 6-10; stigma linear-lobed. Eu. and 



