Duval, H.A. (1809), Plantae Succulentae in Horto Alenconio: 7 [tax. nov.]

Cronquist, A.J. (1981), An Integrated System of Classification of Flowering Plants: 1217 [secondary reference]

Smith, G.F. & van Wyk, B.-E. in Kubitzki, K. (ed.) (1998), Asphodelaceae. The Families and Genera of Vascular Plants 3: 138-139 [secondary reference]

Mabberley, D.J. (1 May 2008), Mabberley's Plant-Book Edn. 3: 393 [secondary reference]

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