Abstract
The purpose of this study is to determine the flowering requirements of Polymnia canadensis and how they correspond to the occurrence of winter annuals, biennials, and short-lived monocarpic perennials in this species. Polymnia canadensis has a vernalization requirement for flowering, and even very small plants (i.e., those with one pair of leaves) can be vernalized. Vernalized plants can flower under both long- and short days. However, to flower plants must attain a minimum postvernalization size. Plants of this primarily monocarpic species that do not die after they flower once require another period of vernalization to flower a second time (i.e., to be dicarpic). Vernalized plants exposed to high temperatures can be devernalized; these must be re-vernalized in order to flower.
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Bender, M.H., Baskin, J.M. & Baskin, C.C. Flowering requirements of Polymnia canadensis (Asteraceae) and their influence on its life history variation. Plant Ecology 160, 113–124 (2002). https://doi.org/10.1023/A:1015891702432
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DOI: https://doi.org/10.1023/A:1015891702432