Salix babylonica but beyond China, it has not generally been as successfully cultivated as some of its hybrid derivatives, being sensitive to late-spring frosts. In the more humid climates of much of Europe and eastern North America, it is susceptible to a canker disease, willow anthracnose ("Marssonina salicicola"), which makes infected trees very short-lived and unsightly. "Salix babylonica" (Babylon willow) has many cultivars, including: Various cultivars of "Salix matsudana" (Chinese willow) are now often included within "Salix babylonica", treated more broadly, including: Yet other weeping willow cultivars are derived from interspecific "Salix" hybrids, including "S. babylonica" in their parentage. The most widely
Salix brachycarpa The plant produces tiny, downy seeds which are viable for just a few days but may germinate within 12 hours of hitting a suitable substrate. There are at least two recognized varieties of this species of willow: A former subspecies, "Salix brachycarpa" subsp. "niphoclada", is now synonymous with "Salix niphoclada", another Alaskan willow species that is also commonly referred to as barren-ground willow. Of note, barren-ground willow is also the common name of a third but distinct species of willow found in Alaska, "Salix nummularia". On the Alaska North Slope, sites that supported this and other low-growing willow species before