Abstract: Rhus typhina, as a typical kind of woody plant, is with the strong abilities of adaptation and root sucker in invasion. We studied the distribution of horizontal lateral roots and adventitious buds of R.typhina by field investigation, anatomic characteristics of the occurrence of adventitious buds and conventional paraffin method, and observed the development of clonal seedling of R.typhina in phenology. The distribution of the horizontal lateral roots of R.typhina is shallow, within 15 cm below the surface, and adventitious buds mainly distributes on the horizontal lateral roots within 2-5 cm soil layer. Adventitious buds germinate throughout the growing season, but there are more buds in spring than those in other three seasons by the field observation. Adventitious buds originate from pericycle cells of horizontal lateral root. Clonal seedlings germinate earlier than their mother trees, they grow rapidly under enough sun light in the forest, which enhanced their competitive strength, provide a good condition for population regeneration and expansion, and promote its invasion.

Key words: Rhus typhina, clone growth, root sprout, anatomy, invade