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There appears to be several species like C. linearifolia (S. China), C. balansae (N Vietnam) with a similar vegetative form and limestone karst habitat. Let's hope that my C. linearifolia survives domestic UK mail and another trip via airmail
With big leaves and photosynthetic green tubers it likes ample water however, it is surprisingly tolerant of water stress. It does not shed leaves in response to drought. Instead the leaves curl-up and young leaves develop permanent deformity if water stressed.