Abstract
For decades, the Texas A&M Univ. campus has been a center for USDA ornamental plant introductions. Historically, horticultural nurseries on the Texas A&M Univ. campus have served as foci from which exotic plants have dispersed and colonized surrounding areas. Pistachia chinensis, Ulmus parvifolia, Ligustrum quihoui, Ligustrum lucidum, and Sapium sebiferum have all established themselves on or near the campus and can be traced back to early introductions. Many Ligustrum taxa including selections of L. quihoui were screened at Texas A&M College in the 1930s. Clones of this species varied greatly in their ability to naturalize. The invasion lag phase and range of expansion varied with both clone and species. It is suggested that potential exotic ornamental plant introductions be carefully evaluated for their potential to become non-native invasive species as well as for their ornamental characteristics.
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