Robertus Cornelis Hilarius Maria Oudejans

Euphorbia denisii is a species of plant in the family Euphorbiaceae. It is endemic to Madagascar. Its natural habitats are subtropical or tropical dry forests and subtropical or tropical dry shrubland. It is threatened by habitat loss.

Euphorbia herbstii (syn. Chamaesyce herbstii) is a rare species of flowering plant in the family Euphorbiaceae known by the common name Herbst's sandmat. It is endemic to Oʻahu, Hawaii, where it is rapidly disappearing. Like other Hawaiian euphorbs, this plant is known locally as ʻakoko. It is a federally listed endangered species of the United States. This plant is usually a tree which can grow up to 8 meters tall. The leaf blades are long and narrow, and the branches bleed a milky sap. The inflorescence is a cluster of cyathia. This species is known from perhaps four populations in mesic

Euphorbia duckei is a species of plant in the family Euphorbiaceae. This species was first described by Léon Croizat as Chamaesyce duckei, and received its current name from Robertus Cornelis Hilarius Maria Oudejans in 1989. It is found in northern Brazil. The holotype specimen was collected by Adolpho Ducke and is held at the Harvard University Herbarium.

Euphorbia cumulicola, commonly referred to as coastal dune sandmat or sand dune spurge, is a rare species of flowering plant endemic to the coastal regions of the US states of Florida and a very narrow region of Georgia.

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