Euphorbia ridleyi Croizat

Last updated: 27 May 2015

Scientific Name

Euphorbia ridleyi Croizat


Euphorbia synadenium Ridl. [Illegitimate] [1]

Vernacular Name

Malaysia Pokok susu hutan, sesudu bukit, sesudu hutan (Peninsular) [2][3]
Thailand Rak luukmaa (Peninsular) [2].

Geographical Distributions

Euphorbia ridleyi is distributed in peninsular Thailand, Peninsular Malaysia; possibly also in India (Bengal). This plant is found locally in rocky, evergreen forest, up to 330 m altitude. [2]

Botanical Description

E. ridleyi comes from the Euphorbiaceae family. It is a slightly succulent, unarmed shrub which is up to measure 1.5 m tall while its stem is unbranched. [2]

The leaves are arranged alternate, oblanceolate-spoon-shaped, up to measure 20 cm long, blunt to subacute apex and with measure about 1.5 cm long petiole. [2]

The purple-pink inflorescence is composed of axillary, solitary, unisexual cyathia and ovate bracts. The male cyathia is with 10 laciniate and pink glands while the female cyathia is with green glands. [2]


No documentation.

Chemical Constituent

No documentation.

Plant Part Used

No documentation.

Traditional Use

No documentation.

Preclinical Data

No documentation.

Clinical Data

No documentation.


No documentation.

Poisonous Management

No documentation

Line drawing


Figure 1: The line drawing of E. ridleyi Croizat (accepted name for E. synadenium Ridley) [2]


  1. The Plant List. Ver1.1 Euphorbia ridleyi Croizat. [homepage on the Internet]. c2013 [updated 2012 Mar 23; cited 2015 May 29] Available from:
  2. Nguyen Nghia Thin, Sosef MSM. Euphorbia synadenium Ridley In: de Padua LS, Bunyapraphatsara N, Lemmens RHMJ, editors. Plant Resources of South-East Asia No. 12(1): Medicinal and poisonous plants 1. Leiden, Netherlands: Backhuys Publisher, 1999; p. 270.
  3. Herbal Medicine Research Centre, Institute for Medical Research. Compendium of medicinal plants used in Malaysia. Volume 1. Kuala Lumpur: HMRC IMR; 2002. p. 334.