Coefficient of Conservatism:
Coefficient of Wetness:
A. A. Reznicek
A native of Asia, sometimes cultivated; it can be aggressive when escaped. A vigorous, large, high-climber, it is a serious invasive of forests and areas near habitation in southern Michigan, capable of smothering trees and shrubs. First collected in 1976 in St. Joseph Co.
Vegetative material of C. orbiculatus can sometimes be difficult to distinguish from C. scandens. More characters are provided by Leicht-Young et al. (2008).
Invasion by this species appears to be marked also by a decline in the native Celastrus scandens in the invaded zone. In addition, the two hybridize, and hybrids are known from Michigan; first reported from Warren Dunes State Park by Zaya et al., (2015). Their frequency is unclear as yet, but flowering Celastrus should be carefully examined. Hybrids can be expected to be as vigorous as C. orbiculatus, and bear flowers both in terminal racemes or panicles and in cymes in the axils of full-sized foliage leaves. Zaya et al., (2015) illustrate this, as well as other diagnostic features of the fruits.