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{{Inc|
Cleistocactus (closed Cactus, referring doubts less to the peculiar flowers). Cactaceae. Slender columnar cacti, with few branches and many-ribbed: fls. short and narrowly curved, orange-red; ovary covered with small appressed bracts bearing hairs in their axils; filaments somewhat exserted and grouped together near the upper lip: fr. spineless; pulp white; seeds slightly punctate.—About 14 species have been described in this genus.
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__NOTOC__{{Plantbox
__NOTOC__{{Plantbox
| name = ''Cleistocactus''
| name = ''Cleistocactus''