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Evidence is presented documenting the occurrence in Canada of two Acorus species. One is a widespread fertile diploid with which the name A. americanus has been associated. The other is a sterile taxon of more limited distribution, no doubt representing the well-known sterile triploid A. calamus of Europe, which has been widely introduced into North America.

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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 northeast. 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 northeast for both species. These results suggest that there may be a shift from allogamy to autogamy in a northeasterly direction across southern Ontario.

One hundred and eight new chromosome counts are reported for the Solidago spathulata–glutinosa complex: 49 diploids (2n = 18) and 59 tetraploids (2n = 36). Only diploids are known in S. spathulata, which occurs along the Pacific coast from southern California to northern Oregon. Diploids, tetraploids, and one hexaploid are known in S. glutinosa, which occurs across North America. Solidago glutinosa ssp. glutinosa is composed of diploids only and is widespread in the Rocky Mountains from Mexico to Alaska and across the Canadian prairies. It also occurs disjunctly on the northern shores of Lake Superior and Lake Huron and farther east on the Gaspé Peninsula in Quebec. Solidago glutinosa ssp. glutinosa var. chlorolepis was found to be diploid (first report). Tetraploids of S. glutinosa ssp. randii were found in scattered locations in northeastern North America and around most of the upper Great Lakes, where they occur sympatrically with diploid populations of ssp. glutinosa. A single hexaploid population of ssp. randii was reported previously from West Virginia; no hexaploids were encountered in this study.