McM&H description: carmine scarlet (RHS 45A). Des Ellery description: white tube, brick red petals. Petals are elliptic with acute to pointed tips, lower petals with acute to blunt tips. Bases are white flushed pink suffusing light red, then vivid cherry red. Tube is white lightly flushed pale mauve pink. Stamens are white. Style is magenta red with a purple-red stigma. Ovary receptacle smooth, dull bronze green.
L. Pfeiffer, Enumeratio Cactearum: 128; Des Ellery Note Card; McM&H 1995: 44, 93; SRL Team
originally named Epiphyllum Altensteinii, L. Pfeiffer (1837); L. Pfeiffer & O. Abildung (1843); Zygocactus altensteinii (Pfeiff.). Zycocactus truncatus var. altensteinii (Pfeiff.) Borg. Altensteinii is one of several historic S. truncata, possibly a wild Brazilian import or more likely an early cultivar raised from seed. It survived two World Wars which is more than can be said for many of the historical cultivars. Des Ellery (Australia) received an 'Altensteinii' from Les Shears in 1981.