Euphorbia knuthii Pax
      
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2 422575 Euphorbia knuthii Pax Euphorbiaceae
I.B. Pole-Evans, E.P. Phillips, R.A. Dyer, L.E. Codd, Fl. Pl. S. Afr., vol. 9 : t. 348 (1929) [C. Letty]