Abstract
The heat resistance of more than 40 species of woody plants and ferns, was examined in summer and in winter. More than half the species showed maximum heat resistance in summer. Patterns of resistance in summer varied between species and were associated with such factors as the number of days from the summer solstice, or from tho nearest warm period, and the temperature on the day of measurement. Heat resistance was weakly correlated with the latitudinal and altitudinal limits of the species examined and there was some association with taxonomic grouping and inverse correlations with frost resistance and water content. In general the heat resistance of these New Zealand species was similar to those of comparable species from other localities, although there was a lack of species with very high resistance (52—59 °C) such as has been recorded for some plants from the Mediterranean region, the Canary Islands and Western Australia.
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