2.2 Plant material
Plants were obtained from specialist nurseries and from the living
collections of the Royal Botanic Gardens, Kew (UK) (Table 1 ).
All species were potted in a mix of 1:1 pumice:sand, except C.
multicava , C. ovata , C. perforata which were potted in a
mix of 1:3:3 potting mix:pumice:sand. All plants were grown in a
greenhouse with 12-hour days and 20/17°C day/night temperatures. The
methods described below were applied, for each species, to the part of
the leaf where water uptake was more likely, due to the presence and/or
higher abundance of hydathodes (see Table 2 ).