Lepismium cruciforme var. cavernosum (Lindbg.) Backbg.Treated as a synonym of L. cruciforme by B&T in Bradleya 13 Desc from Backeberg 1977 Flowers translucent white R Knightii (Knight's) - Stems and joints as in R. commune. Detail from Cactus Culture – Watson 1889: Wings of joints usually broad, with red margins, and the hair in the notches in a dense tuft, nearly 1 in. long, pure white, and silklike. Flowers small, white. This species, which thrives best under warm-house treatment, is a native of Brazil, and is usually grown only for its curious, Cereus-like stems. It forms a straggling plant about 1 ft. high. Syn. Lepismium Knightii, Cereus Knightii.
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