Stomatal safety margin (Pg12 − P50) of species from mountain fynbos showing the range of stomatal regulation strategies within a single community. We propose that Pg12 − P50 provides a proxy for degree of isohydry/anisohydry. The full names for all species shown are as follows: Cannomois congesta, Hypodiscus aristatus, Osmitopsis asteriscoides, Erica monsoniana, Brunia alopecuroides, Mimetes cucullatus, Erica plukenetii, Erica vestita, Mimetes hirtus, Leucadendron salicifolium, Leucadendron salignum, Leucadendron laureolum, Protea repens, Cliffortia ruscifolia, Aspalathus hirta, Aspalathus pachyloba, Metalasia densa.