Are both Promenaea and Machaeranthera from North America?
Machaeranthera Machaeranthera is a genus of North American flowering plants in the daisy family which are known by the common name tansyaster.
Leucaena Leucaena is a genus of flowering plants in the mimosoid clade of the subfamily Caesalpinioideae of the legume family Fabaceae. It contains about 24 species of trees and shrubs, which are commonly known as leadtrees. They are native to the Americas, ranging from Texas in the United States south to Peru. The generic name is derived from the Greek word λευκός ("leukos"), meaning "white," referring to the flowers.