Meet the Trees: Redbud

Meet the Trees: RedbudMadison Square Park’s redbud tree puts on a show every spring. Also known as Cercis canadensis, this small to medium-sized tree is native to North America and Asia. As a member of the family Fabaceae, the redbud is related to several other plants that grace the Park with their presence, including cassias, wisteria, and black locust. Plants of this family are related to the peas and beans, and the relationship is noticeable in their flowers. The flowers of the redbud, as well as other members of Fabaceae, are very similar to those of a pea flower, often having an upper petal that looks like two fused together (a banner) and two lower petals actually fused together (the keel) that enclose the flower’s reproductive parts. 

Meet the Trees: RedbudFor redbuds, in particular, close inspection will reveal the presence of a keel, but no banner. The keel protects the reproductive parts from rain until a pollinator visits the flower. Here at the Park, these pollinators are often honeybees, bumblebees, or native leaf-cutting bees, which also cut out distinctive (but only cosmetically damaging) holes in redbud leaves. Redbuds flower early in the season, with flowers borne along the branches of the tree rather than only at the apex of stems. The odd location of the flowers makes for a gorgeous site when these trees bloom in early spring. The flowers are present before the leaves develop, allowing for a floral display with little distraction. Following flowering, redbuds develop long, dry seedpods called a legume that resemble a bean pod, another clue to their shared heritage. 

Thanks to our horticulturalists at Madison Square Park, we keep phenological data on our redbuds. Cercis sp. They are one of our five collection plants in the Park, with over 30 distinct cultivars present and more anticipated. While most are eastern redbud, a native to the eastern reaches of North America, there are several cultivars of Cercis chinensis, Chinese redbud, as well as a small number of other species.