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The rhythm of vascular cambial activity was studied in four species of lianas growing in a lowland tropical rainforest of Mexico. Cambial activity was determined by counting the number of layers of cells in the cambial zone. A greater number of layers was assumed to indicate greater cambial activity. In all four species ( Machaerium cobanense, M.floribundum, Gouania lupuloides  and  Trichostigma octandrum ) the cambium is active throughout the year. In three of the species (all but  T. octandrum ) cambial activity was significantly higher in the April-October rainy period than in the November-March dry period. Cambial activity in Trichostigma octandrum was not significantly associated with the wet or dry season.

Seasonality in Cambial Activity of four Lianas from A Mexican Lowland Tropical Rainforest