Abstract
AFTER a short burst of chasmogamous flowering in early spring, plants of V. palustris, like those of many other violet species, produce a succession of cleistogamous flowers throughout the summer. Such a change in flowering habit could be associated with changes in day-length, as in V. fimbriatula and V. papilionacea with which Allard and Garner1 obtained chasmogamous flowers only in short days and cleistogamous flowers in long days. With several other violet species Chouard2 has obtained chasmogamous flowering only in short day-lengths (for example, V. odorata), or after exposure to winter temperatures (for example, V. silvestris), or after both winter temperatures and subsequent short-day treatment (for example, V. hirta).
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