Biomass-allocation patterns in populations of Trillium erectum and T. grandiflorum in southern Ontario

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Abstract
Biomass-allocation patterns to aerial tissues were examined among six populations for each of Trillium erectum L. and T. grandiflorum (Michx.) Salisb. in southern Ontario. Total biomass did not differ among populations of T. erectum, but androecial proportions and reproductive effort generally decreased from southwest to northwest. Total biomass of T. grandiflorum varied significantly among populations and its pattern of reproductive effort was the reverse of that of T. erectum. Androecium-gynoecium ratios decreased across southern Ontario from southwest to northwest for both species. These results suggest that there may be a shift from allogamy to in a northeasterly direction across southern Ontario.

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