1. Family: Euphorbiaceae Juss.
    1. Genus: Euphorbia L.
      1. Euphorbia caput-medusae L.

        There are more than 2,000 species of Euphorbia (spurge). They range widely in habit from trees and succulent perennials to small annual herbs. They all produce caustic milky sap.

    [KSP]

    Kew Species Profiles

    General Description
    Medusa's head is so named because of its numerous snake-like stems.

    There are more than 2,000 species of Euphorbia (spurge). They range widely in habit from trees and succulent perennials to small annual herbs. They all produce caustic milky sap.

    Euphorbia caput-medusae was introduced from South Africa to the Netherlands around 1700 and described by Linnaeus in his Species Plantarum (1753). Linnaeus had previously worked for George Clifford, a banker and one of the directors of the Dutch East India Company (Verenigde Oostindische Compagnie, VOC). Clifford owned a garden (Hartekamp) near Haarlem, in which he grew a great variety of plants, many sent to him by VOC employees in the Cape. As a result, Linnaeus had an unrivalled opportunity to get to know some of the South African plants coming into Europe at that time, and his work in cataloguing Clifford's plants, published in 1737 as Hortus Cliffortianus, was to stand him in good stead when he came to organise his later work.

    The Latin (and common) name 'head of Medusa' describes the plant well, and it is likely that this was among the species grown in Clifford's garden.

    Species Profile
    Geography and distribution

    Endemic to the Cape region of South Africa, from Namaqualand to Mossel Bay.

    Description

    Euphorbia caput-medusae is a sprawling, succulent shrub, reaching 1 m across. It has a rosette of narrow, snake-like, spineless but knobbly branches, each 10-30 mm in diameter that arise from a short woody stem (caudex) and which rapidly lose their leaves . The remaining narrow, fleshy leaves and a cluster of inflorescences are carried at the end of the branches.

    The specialised inflorescences (cyathia) each have a cup-shaped involucre (a whorl of bracts around or beneath the inflorescence) that is 12 mm or more across, with five incurved (bent inwards) lobes and five green shining glands. Each gland is divided into 3-6 white linear or forked processes (outgrowths) which form a fringe around the individual male flowers, each of which has a single stamen, and the single female flower with an elongated pedicel (flower stalk).

    Illustration from Curtis's Botanical Magazine

    The specimen figured in the featured illustration by Matilda Smith was drawn from the garden of La Mortola, Italy, 'where it flowered in March 1916 - the only difference from the wild plant being in its considerably thicker branches.'

    Kew paintings of Medusa's head

    Matilda Smith, who painted the image in  Curtis's Botanical Magazine , was a relation of Joseph Dalton Hooker, Director of Kew from 1865-1885. Hooker trained her as a botanical artist by getting her to draw from living specimens as well as to copy drawings from  Curtis's Botanical Magazine . In 1898 she became the first official paid artist at Kew.

    Uses

    Euphorbia caput-medusae is cultivated as an ornamental, and is a particular favourite of succulent plant enthusiasts.

    This species at Kew

    Medusa's head is grown behind the scenes, in the Tropical Nursery at Kew.

    Kew's Economic Botany Collection includes a sample of the acrid milky juice from Euphorbia caput-medusae that was donated to Kew by the artist Thomas Baines in 1854. It is available to researchers from around the world, by appointment.

    Distribution
    South Africa
    Ecology
    Sandy flats and rocky coastal outcrops.
    Conservation
    Least Concern (LC) according to the Red List of South African Plants 2009, following IUCN Red List criteria.
    Hazards

    The milky sap (latex) is a skin and eye irritant.

    Images

    Distribution

    Native to:

    Cape Provinces, Northern Provinces

    Common Names

    English
    Medusa's head

    Euphorbia caput-medusae L. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Bolus, H. [9448], South Africa Euphorbia ramiglans K000253279 isotype
    May 1, 2017 Bolus, H. [9767], South Africa Euphorbia bolusii K000253331 isotype
    May 1, 2017 MacOwan [3286], South Africa Euphorbia macowanii K000253330 lectotype
    May 1, 2017 MacOwan [3286], South Africa Euphorbia macowanii K000407083 lectotype
    Schlechter [8419], South Africa Euphorbia macowanii K000253329 syntype
    May 1, 2017 Pearson, H.H.W. [2261], South Africa Euphorbia muirii K000253343 syntype
    May 1, 2017 Muir [s.n.], South Africa Euphorbia muirii K000253344 syntype
    May 1, 2017 Grey, F. [s.n.], South Africa Euphorbia tuberculatoides K000253345 syntype
    May 1, 2017 Bachmann [1042], South Africa Euphorbia tuberculatoides K000253346 lectotype
    May 1, 2017 Marloth, R. [5733], South Africa Euphorbia marlothiana K000253342 isotype
    Jan 1, 2003 Moss, C.E. [2908], South Africa Euphorbia marlothiana K000390471
    Bolus, H. [4359], South Africa Euphorbia marlothiana K000390470
    Esterhuysen, E.E. [s.n.], South Africa Euphorbia marlothiana K000390467
    Dyer, R.A. [4089], South Africa Euphorbia marlothiana K000390469
    Dyer, R.A. [4089], South Africa Euphorbia marlothiana K000390472
    Vander Merwe, F.Z. [s.n.], South Africa Euphorbia marlothiana K000390468

    First published in Sp. Pl.: 452 (1753)

    Accepted by

    • Bruyns, P.V. (2012). Nomenclature and typification of southern African species of Euphorbia Bothalia 42: 217-245.
    • Govaerts, R., Frodin, D.G. & Radcliffe-Smith, A. (2000). World Checklist and Bibliography of Euphorbiaceae (and Pandaceae) 1-4: 1-1622. The Board of Trustees of the Royal Botanic Gardens, Kew.

    Literature

    Kew Species Profiles
    • World Checklist of Selected Plant Families (2010). Euphorbia caput-medusae. The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Raimondo, D. et al. (2009). Red List of South African Plants 2009. Strelitzia 25. South African National Biodiversity Institute, Pretoria.
    • Goldblatt, P. & Manning, J. (2000). Cape Plants. A Conspectus of the Cape Flora of South Africa. National Botanical Institute, Cape Town & Missouri Botanical Garden, St Louis.
    • Manning, J. & Goldblatt, P. (1996). West Coast: South African Wildflower Guide 7. Botanical Society of South Africa with the Darling Wildflower Society, Cape Town.
    • Prain, D. (1916). Euphorbia caput-medusa e L. Curtis’s Botanical Magazine t. 8673.
    Kew Backbone Distributions
    • Bruyns, P.V. (2012). Nomenclature and typification of southern African species of Euphorbia Bothalia 42: 217-245.

    Sources

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Kew Species Profiles
    Kew Species Profiles
    http://creativecommons.org/licenses/by-nc-sa/3.0