By N. A. Sloan
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Extra resources for Poplar Culture in North America
14. Quaking aspen has the largest natural range of any tree indigenous to North America. Within this range its form can vary considerably. (A) An imposing clone growing on a moist, rich site in west-central Colorado. (B) A shrubby clone eking out an existence in a thin, rocky soil on a west-facing slope in Wyoming. Photo by Kathleen McKevitt. 75 25 25 5 5 0 0 100 95 75 they are rooted under mist in a greenhouse. Sexual reproduction by quaking aspen is abundant, and the light cottony seed, which matures in early spring, is carried long distances by the wind.
Tomentosa Carr. May also be a tri-hybrid containing genes from P. tremula P. alba × P. grandidentata P. ×rouleauiana Boivin P. alba × P. tremula P. ×canescens Sm. P. alba × P. tremuloides P. ×heimburgeri Boivin P. angustifolia × P. balsamifera P. ×brayshawii Boivin Brayshaw’s poplar P. angustifolia × P. deltoides P. ×acuminata Rydb. Lanceleaf cottonwood; synonym P. ×andrewsii Sarg. P. angustifolia × P. fremontii P. ×hinkleyana Corr. P. angustifolia × P. balsamifera × P. deltoides None Trihybrid P.
Female or sometimes hermaphroditic Tacamahaca P. szechuanica tibetica Schn. P. S. Pyramidal form P. trichocarpa hastata Henry Thick, narrow leaves; smooth, long fruits Populus P. alba 100 95 75 globosa Spaeth. Shrub or tree; dense foliage hickeliana Dode Mediterranean distribution microphylla Maire Mediterranean distribution nivea Ait. Leaves silvery and hairy beneath, lobed pendula Loud. With pendulous branches pyramidalis Bge. vp Wednesday, November 07, 2001 3:22:36 PM Color profile: Generic CMYK printer profile Composite 150 lpi at 45 degrees 100 100 Poplar Culture in North America 95 75 25 5 95 Table 2 (concluded).