title: Two types of carbon fixation in tropical orchids.
abstract: The isotopic composition of the carbon (δ(13)C values) of leaf tissue from 10 species and hybrids of orchids grown in Singapore fell into two groups, one having a mean value of-15.4‰, the other-26.6‰. The least negative of these values was associated with thick-leaved plants (0.2-0.4 mm). This is consistent with the view that some orchids are CAM plants and others possess a C3 type of carbon fixation.
authors.affiliation: Botany School, University of Melbourne, 3052, Parkville, Victoria, Australia.
authors.forename: T F
authors.initials: TF
authors.lastname: Neales
authors.forename: C S
authors.initials: CS
authors.lastname: Hew