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Genus Simarouba
- type genus of Simaroubaceae; tropical American trees and shrubs having a pale soft wood and bitter bark
Genus Ailanthus
- small genus of east Asian and Chinese trees with odd-pinnate leaves and long twisted samaras
Genus Kirkia
- small genus of tropical South African trees and shrubs
Genus Picrasma
- small genus of deciduous trees of tropical America and Asia
Genus Quassia
- tropical trees and shrubs with pinnate leaves and large scarlet flowers; bark is medicinal
Genus Tropaeolum
- a tropical American genus of dicotyledonous climbing or diffuse pungent herbs constituting the family Tropaeolaceae
Genus Zygophyllum
- usually tropical herbs or shrubs having ill-smelling foliage and flower buds that are used as capers: bean capers
Genus Guaiacum
- small genus of evergreen resinous trees or shrubs of warm and tropical America