Diagnose: —Ab 0. navioide (L. B. Smith) L. B. Smith, cui valde affinis, foliorum laminis subtus densissime albo-lepidotis, bracteis florigeris integerrimis differt.Edited from (09-03-2023): Smith & Read 1979b. (protologue) Orthophytum Burle-Marxii .