Literature
Authors | Year | Title |
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| Submitted | Genera Plantarum 310. 1789. | |
| Submitted | Gard. Dict. Abr. (ed. 4) 1: | |
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| Submitted | Abh. Math.-Phys. Cl. Königl. Bayer. Akad. Wiss. 2: 675 | |
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| Submitted | Cact. 3: 208–209 | |
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| Submitted | Taschenb. Cactuslieb. 2: 124 | |
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| Submitted | Bull. Torrey Bot. Club 35(12): 561–566 | |
| Submitted | Cact. 2: 155, f. 225 | |
| Submitted | Darwiniana 34(1/4): 395 | |
| Submitted | Allg. Gartenzeitung 3: 315 | |
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| Submitted | Kaktus-ABC 155 | |
| Submitted | Kaktus-ABC 155 | |
| Submitted | Cacti Price-List 1928: [3] | |
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| Submitted | Gard. Dict. Abr. (ed. 4) 2: | |
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| Submitted | Hort. Dyck. 360 | |
| Submitted | Cactaceae Handb. Kakteen. Pereskioideae Opuntioideae 1: 414 | |
| Submitted | Gard. Dict. Abr. (ed. 4) 3: |