Diodia

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Lamiids
Ordo: Gentianales

Familia: Rubiaceae
Subfamilia: Rubioideae
Tribus: Spermacoceae
Genus: Diodia
Species: D. apiculata – D. ocymifolia – D. radula – D. sarmentosa – D. teres – D. virginiana
Name

Diodia L.

Diodia (or buttonweed) is a genus of flowering plants in the family Rubiaceae. It was described by Carl Linnaeus in 1753. The genus is found from southern and eastern United States, South America, Central America, Mexico, the West Indies and tropical Africa.[2][3]

Other buttonweeds

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. 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 barbata (Poir.) DC. - Guyana, Dominican Republic
Diodia barbigera Hook. & Arn. - Mexico
Diodia discolor DC. - French Guiana
Diodia domingensis DC. - Dominican Republic
Diodia flavescens Hiern - Angola, Zambia
Diodia incana Aresch. - Ecuador
Diodia kuntzei K.Schum. - Venezuela, Bolivia, Peru, Brazil, Argentina, Paraguay
Diodia macrophylla K.Schum. - Brazil, Paraguay
Diodia microcarpa K.Schum. - Brazil
Diodia mitens Bello - Puerto Rico
Diodia othonii Rizzini - Brazil
Diodia paludosa Kuntze - Paraguay
Diodia perforata Urb. - Haiti
Diodia rubricosa Hiern - Ghana, Ivory Coast, Liberia, Nigeria, Sierra Leone
Diodia saponariifolia (Cham. & Schltdl.) K.Schum.
Diodia saponarioides C.Presl - Mexico, Brazil, Argentina, Paraguay
Diodia simplex Sw. - Cuba, Jamaica
Diodia spicata Miq. - Panama, Colombia, Venezuela, Guyana, French Guinea, Brazil
Diodia vaginalis Benth. - Benin, Ghana, Ivory Coast, Liberia, Nigeria, Sierra Leone, Togo, Cameroon, Gabon, Congo-Brazzaville
Diodia verticillata Vahl - Brazil, Lesser Antilles
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

References

Kew World Checklist of Selected Plant Families
"Diodia in the World Checklist of Rubiaceae". Retrieved 22 June 2012.
USDA Plants Database