| Summary: | <p class="MsoNormal" style="margin-bottom: 0.0001pt;"><span style="font-size: 9.0pt; font-family: " lang="EN-US">The genus <em>Elodea </em>Richard in Michaux was first published in 1803</span></p> <span style="font-size: 9.0pt; font-family: " lang="EN-US">(Fl. Bor.-Am. 1: 20, 1803), based upon the single species. <em>E. Canadensis </em>from Montreal, Quebec, Canada. Though this was stated to have perfect<em> </em>flowers, it is now certain that the holotype specimens and the plants in<em> </em>nature are dioecious. Very abundant are plants bearing pistillate flowers<em> </em>with three stigmas and three acicular staminodia. Staminate plants are<em> </em>rare, but occur throughout the natural range of the species. Their flowers<em> </em>have nine stamens, but no trace of a gynoecium. Two well known species<em> </em>are now separated and placed in the genus <em>Egeria </em>Planch., a group just<em> </em>monographed by the writer. Left in <em>Elodea </em>are seventeen species. These<em> </em>are to be found in two broad areas, the northern ones in the United States<em> </em>and southern Canada; the southern ones in South America. As yet there<em> </em>is no evidence of any indigenous species of <em>Elodea </em>in Central America.</span><br><p class="MsoNormal" style="margin-bottom: 0.0001pt;"><span style="font-size: 9.0pt; font-family: " lang="EN-US">The genus <em>Elodea </em>Richard in Michaux was first published in 1803</span></p><span style="font-size: 9.0pt; font-family: " lang="EN-US">(Fl. Bor.-Am. 1: 20, 1803), based upon the single species. <em>E. Canadensis </em>from Montreal, Quebec, Canada. Though this was stated to have perfect<em> </em>flowers, it is now certain that the holotype specimens and the plants in<em> </em>nature are dioecious. Very abundant are plants bearing pistillate flowers<em> </em>with three stigmas and three acicular staminodia. Staminate plants are<em> </em>rare, but occur throughout the natural range of the species. Their flowers<em> </em>have nine stamens, but no trace of a gynoecium. Two well known species<em> </em>are now separated and placed in the genus <em>Egeria </em>Planch., a group just<em> </em>monographed by the writer. Left in <em>Elodea</em>are seventeen species. These<em> </em>are to be found in two broad areas, the northern ones in the United States<em></em>and southern Canada; the southern ones in South America. As yet there<em> </em>is no evidence of any indigenous species of <em>Elodea </em>in Central America.</span>
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