Journal
ISRAEL JOURNAL OF PLANT SCIENCES
Volume 52, Issue 4, Pages 323-329Publisher
BRILL
DOI: 10.1560/N1B6-7T7E-1BL8-V9XC
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The molecular phylogeny of Alismatidae based on analysis of chloroplast rbcL gene sequence data serves as a framework within which to evaluate the evolutionary advancement of aquatic life-forms in this group. Forty-five genera representing all currently recognized families in the subclass are included in our study. The present analysis indicates that the submersed, floating-leaved, and free-floating life-forms are all polyphyletic within the subclass Alismatidae. Three independent origins of the submersed life-form in Alismatidae with one reversal to emergent life-form are explored in this study. Two separate origins of the free-floating life-form and three separate origins of the floating-leaved life-form in the subclass are also suggested. It is possible for the free-floating life-form to have been derived directly from the submersed life-form and it could also be that the free-floating life-form has been derived from the emergent one. The emergent life-form is considered as progenitorial in the Alismatidae, giving rise to submersed, floating-leaved, and free-floating forms by adaptive radiation.
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