Colin Ernest Ridsdale

Psydrax pergracilis is a species of flowering plant in the family Rubiaceae. It is endemic to Kerala in India.

Ochreinauclea is a genus of plant in the family Rubiaceae. It contains the following species: Ochreinauclea maingayi (Hook.f.) Ridsdale Ochreinauclea missionis (Wall. ex G. Don) Ridsd.

Psydrax montana is a species of flowering plant in the family Rubiaceae. It is endemic to Sri Lanka. The Latin specific epithet montana refers to mountains or coming from mountains.

Ochreinauclea missionis is a species of plant in the family Rubiaceae. It is endemic to India. It is threatened by habitat loss. The caterpillars of the commander (Limenitis procris), a brush-footed butterfly, utilize this species as a food plant.

Mitragyna stipulosa is a species of flowering plant in the family Rubiaceae. It is found in Angola, Cameroon, Central African Republic, the Republic of the Congo, the Democratic Republic of the Congo, Gabon, Gambia, Ghana, Guinea, Nigeria, Senegal, Sierra Leone, Sudan, Uganda, and Zambia. Its natural habitats are subtropical or tropical moist lowland forests and subtropical or tropical swamps. It is threatened by habitat loss.

Ludekia is a genus of flowering plants belonging to the family Rubiaceae. Its native range is Malesia.

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Breonadia is a monotypic genus of flowering plants in the family Rubiaceae. It was described by Colin Ernest Ridsdale in 1975. The genus contains only one species, viz. Breonadia salicina, which is found in tropical and southern Africa from Mali and Benin east to Ethiopia, south to South Africa, as well as Yemen, Saudi Arabia and Madagascar. Breonadia salicina (Matumi, Afrikaans: Mingerhout, Sotho: Mohlomê, Venda: Mutu-lume, Zulu: Umfomfo) is a protected tree in South Africa.

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Jackiopsis is a monotypic genus of flowering plants in the family Rubiaceae. It was described by Colin Ernest Ridsdale in 1979. The genus contains only one species, viz. Jackiopsis ornata, which is found in Borneo, Malaysia and Sumatra. It is also the only species in the tribe Jackieae. According to Henry Nicholas Ridley, Malay name for Jackiopsis ornata is segan paya.

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