The U.S. National Arboretum was assigned to be the International Cultivar Registration Authority for Cercis©

D. Kidwell-Slak, M. Pooler
Redbuds are a significant nursery crop for much of the American nursery industry. Eastern redbud (Cercis canadensis) are endemic and widely distributed from Canada to Florida. Southern variants (subsp. texensis and var. mexicana) grow natively in the southwest and a western species (C. canadensis var. orbiculata) grow natively west of the Rocky Mountains. In addition to the native American taxa, several Asian taxa are cultivated and represent a significant nursery crop in the United States. Although cultivated for over a century, there has recently been a large increase in the number of named cultivars on the market. With the large increase in named cultivars, it will be beneficial to the green industry and gardeners to create a checklist with cultivar description and general identifying information to help differentiate cultivars.
According to the latest (2014) USDA Census of Horticulture Specialties, redbuds were the fifth most valuable deciduous flowering tree crop in the USA, seventh most commonly grown flowering deciduous tree, and fourth highest value flowering deciduous tree per plant sold ($26.76 plant-1). Redbuds were grown in 1,272 nurseries in 44 states.
The popularity of redbuds is due, in part, to the availability of cultivars with diverse leaf color, habit, and flower color. Additionally, redbuds can be grown in a very wide range of environments and have very few diseases or pests.
Kidwell-Slak, D. and Pooler, M. (2017). The U.S. National Arboretum was assigned to be the International Cultivar Registration Authority for Cercis©. Acta Hortic. 1174, 273-274
DOI: 10.17660/ActaHortic.2017.1174.55
https://doi.org/10.17660/ActaHortic.2017.1174.55
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Acta Horticulturae