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17.39 Dudleya California J.M. Johnston no 1791 17.40 Dudleya " " [[Ditto for: California J.M. Johnston]] 1792 17.41 Stylophylleem [[underlined]] Dead [[/underlined]] " " [[Ditto for: California J.M. Johnston]] - 17.42 Hasseanthus elongatus " " [[Ditto for: California J.M. Johnston]] no. 1794 17.43 Opuntia exaltatus Berger. Peru, Matucana J. Gaucion. 1917 18.01 Echnocactus dead 1802 Mamillarea robustispina Forrest Shreve Arizona