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5 495782 Haworthia rigida (Lam.) Haw. [116 43935 Aloe cylindracea var. rigida Lam.]
J.M.F.A.H.I. Salm-Reifferscheidt-Dyck [Salm-Dyck], Aloes Mesembr., vol. 1 (Aloe): , fig. 4.3 (1849)
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