Thesium is a genus of flowering plants in the family Santalaceae. It is particularly well represented in South Africa. The following species are recognised by The Plant List: Thesium acuminatum A.W. Hill Thesium acutissimum A. DC. Thesium aellenianum Lawalrée Thesium affine Schltr. Thesium aggregatum A.W. Hill Thesium alatum Hilliard & B.L. Burtt Thesium albomontanum Compton Thesium alpinum L. Thesium amicorum Lawalrée Thesium andongense Hiern Thesium angolense Pilg. Thesium angulosum DC. Thesium annulatum A.W. Hill Thesium annuum Lawalrée Thesium aphyllum Mart. ex A. DC. Thesium archeri Compton Thesium arvense Horv. Thesium asperifolium A.W. Hill Thesium asterias A.W. Hill Thesium atrum A.W.Hill Thesium auriculatum Vandas Thesium australe R. Br. Thesium bangweolense R.E. Fr. Thesium bathyschistum Schltr. Thesium bavarum Schrank Thesium bequaertii Robyns & Lawalrée Thesium bergeri Zucc. Thesium boissierianum A. DC. Thesium bomiense C.Y. Wu ex D.D. Tao Thesium brachyanthum Baker Thesium brachygyne Schltr. Thesium brachyphyllum Boiss. Thesium brasiliense A. DC. Thesium brevibarbatum Pilg. Thesium brevibracteatum P.C. Tam Thesium breyeri N.E. Br. Thesium bundiense Hilliard Thesium burchellii A.W. Hill Thesium burkei A.W. Hill Thesium caespitosum Robyns & Lawalrée Thesium capitatum L. Thesium capitellatum A. DC. Thesium capituliflorum Sond. Thesium cathaicum Hendrych Thesium celatum N.E. Br. Thesium chimanimaniense Brenan Thesium chinense Turcz. Thesium cinereum A.W.Hill Thesium commutatum Sond. Thesium confine Sond. Thesium congestum R.A. Dyer Thesium conostylum Schltr. Thesium cordatum A.W. Hill Thesium coriarium A.W. Hill Thesium cornigerum A.W. Hill Thesium corsalpinum Hendrych Thesium crassipes Robyns & Lawalrée Thesium cupressoides A.W. Hill Thesium cymosum A.W. Hill Thesium cytisoides A.W. Hill Thesium davidsonae Brenan Thesium decaryanum Cavaco & Keraudren Thesium deceptum N.E. Br. Thesium decipiens Hilliard & B.L. Burtt Thesium densiflorum A. DC. Thesium densum N.E. Br. Thesium disciflorum A.W. Hill Thesium disparile N.E. Br. Thesium dissitiflorum Schltr. Thesium dissitum N.E. Br. Thesium divaricatum Jan ex Mert. & W.D.J.Koch Thesium diversifolium Sond. Thesium dolichomeres Brenen Thesium dollineri Murb. ex Velen. Thesium doloense Pilg. Thesium dumale N.E. Br. Thesium durum Hilliard & B.L. Burtt Thesium ebracteatum Hayne Thesium ecklonianum Sond. Thesium elatius Sond. Thesium emodi Hendrych Thesium equisetoides Welw. ex Hiern Thesium ericaefolium A. DC. Thesium euphorbioides L. Thesium euphrasioides A. DC. Thesium exile N.E. Br. Thesium fallax Schltr. Thesium fanshawei Hilliard Thesium fastigiatum A.W. Hill Thesium fenarium A.W. Hill Thesium filipes A.W.Hill Thesium fimbriatum A.W. Hill Thesium flexuosum A. DC. Thesium foliosum A. DC. Thesium fructicosum A.W. Hill Thesium fulvum A.W. Hill Thesium funale L. Thesium fuscum A.W.Hill Thesium galioides A. DC. Thesium germainii