Sonchus angustissimus Hook.f.
      
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1 960353 Sonchus angustissimus Hook.f. Compositae
J. Hutchinson, J.M. Dalziel, R.W.J. Keay, Fl. W. Trop. Afr., ed. 2, vol. 2 : p. 295, fig. 266 (1963) [S. Ross-Craig]