common buckthorn Rhamnaceae Rhamnus cathartica L. symbol: RHCA3 Leaf: Opposite or sub-opposite (partially alternate), simple, elliptical to nearly oval, 2 to 3 inches long, finely serrated, dark shiny green above, much lighter below. Flower: Species is dioecious; small, yellow-green, 4 petals, in small clusters, appearing in spring. Fruit: Round, 1/4 inch in diameter, drupe, shiny black when ripe in late summer. Twig: Slender stiff, reddish brown, later with exfoliating gray layer, many end in a sharp thorn; buds, scaly, ovate, pointed, 1/4 inch, reddish brown to dark brown, appressed. Bark: Smooth, shiny gray to reddish brown with numerous lenticels, later becoming dark gray and scaly; large specimens become rectangular blocky; inner bark is yellow. Form: A large, suckering shrub or small low branching tree up to 25 feet tall. Looks like: Carolina buckthorn - glossy buckthorn - deciduous holly Additional Range Information: Rhamnus cathartica is planted in the USDA hardiness zones shown above and may seed into the landscape. See states reporting common buckthorn. External Links: USDA Plants Database © Copyright 2016, Virginia Tech Dept. of Forest Resources and Environmental Conservation, all rights reserved. Photos and text by: John Seiler, Edward Jensen, Alex Niemiera, and John Peterson