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Many species of Diodia have been transferred to a closely related genus Diodella, and therefore the name Buttonweed also applies to these species. There are also many species of False Buttonweeds in the related genus Spermacoce. The Velvetleaf Abutilon (Abutilon theophrasti) in the family Malvaceae is also known by the common name of Buttonweed.
Species
Diodia aulacosperma K.Schum. - Socotra, Somalia, Kenya, Tanzania
Diodia virginiana L. - Virginia Buttonweed - south-central and south-eastern United States from Texas to Kansas, east to Florida and New Jersey; also Connecticut, Cuba and Nicaragua. Naturalized in Japan, Taiwan and northern California