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Genus Acocanthera
- small genus of trees and shrubs containing strongly toxic cardiac glycosides; Arabia to Africa
Genus Acokanthera
- small genus of trees and shrubs containing strongly toxic cardiac glycosides; Arabia to Africa
Genus Adenium
- 1 species: succulent shrub or tree of tropical Africa and Arabia
Genus Allamanda
- genus of tropical American woody vines
Genus Alstonia
- genus of evergreen trees or shrubs with white funnel-shaped flowers and milky sap; tropical Africa to southeastern Asia and Polynesia
Genus Amsonia
- genus of herbs and subshrubs with milky juice and showy bluish flowers; Europe to Asia Minor to Japan and North America
Genus Beaumontia
- small genus of evergreen woody vines in the East Indies and Asia
Genus Carissa
- Old World genus of tropical evergreen usually spiny shrubs
Genus Catharanthus
- small genus of erect annual or perennial herbs native to Madagascar; widely naturalized in the tropics; formerly included in genus Vinca
Genus Holarrhena
- genus of deciduous trees and shrubs of tropical Africa and Asia