plant-scans: 1.Astrophytum myriostigma, 2.Astrophytum asterias, 3.Chamaecereus silvestrii, 4.Aporocactus flagelliformis, 7.Selenicereus pteranthus, The Illustrated Guide to Cacti and Indoor Plants, B.Schonfelder and W.J. Fischer, 1972
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