Isoetes palustris, Erianthus giganteus and Thalia geniculata.    From Wordnik.com.  [Cuban wetlands] Reference

There are isolated groves of the rare endemic Kamchatkan fir Abies gracilis, also Sakhalin fir Abies sachalinensis, unusual thermally influenced caldera communities and several nationally threatened plants such as Cypripedium macranthon, Carex viridula, Fimbristylis ochotensis, Isoetes asiatica, Poa radula and Rhodiola rosea.    From Wordnik.com.  [Volcanoes of Kamchatka, Russian Federation] Reference

In those cases in which certain species readily grow in each other's company -- and cases of this kind are familiar to florists -- when, for instance, Isoetes, Lobelia.    From Wordnik.com.  [Introduction to the Science of Sociology] Reference

Ancient aquatic plant on the rocks - Isoetes eludens, a species of an ancient group of spore-plants known as quillworts, and so named because it eluded its discoverers for seven years, was found in a mountain-top rock pool in a remote corner of Namaqualand, South Africa by the Royal Botanic Gardens, Kew's Director, Professor Stephen Hopper.    From Wordnik.com.  [PhysOrg.com - latest science and technology news stories] Reference

"Isoetes eludens, a species of an ancient group of spore-plants known as quillworts ... was found in a mountain-top rock pool in a remote corner of Namaqualand ... by Kew's director.    From Wordnik.com.  [News24 Top Stories] Reference

Isoetes stevensii.    From Wordnik.com.  [An Open Letter to 600 Steves - The Panda's Thumb] Reference

Quillworts Isoetes spp.    From Wordnik.com.  [The Field Guide to Wildlife Habitats of the Eastern United States] Reference

Prepared Equisetum and Isoetes for.    From Wordnik.com.  [The Fern Lover's Companion A Guide for the Northeastern States and Canada] Reference

Other genera include Gentiana, Hypsela, Isoetes, Lilaeopsis, Ourisia, and Scirpus.    From Wordnik.com.  [Central Andean wet puna] Reference

Wetlands between Andalusia and Bristol, Pennsylvania, including Neshaminy State Park, are reported to contain several plant species that are endangered in the State including the arrowhead (Sagittaria calycina), coast violet (Viola brittoniana), river bank quillwort (Isoetes riparia), and swamp beggar-ticks (Bidens bidentoides) (Wiegman, 1985, pp. 44-48, 66-67, 74).    From Wordnik.com.  [Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA)] Reference