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FNA | Family List | FNA Vol. 2 | Azollaceae | Azolla

2. Azolla mexicana C. Presl, Abh. Königl. Böhm. Ges. Wiss. ser. 5, 3: 150. 1845.

Plants green or often blue-green to dark red, some red-fringed leaves usually present in nature, free-floating or forming a multilayer mat to 4 cm thick in early summer; plants frequently fertile. Stems prostrate, 1--1.5 cm. Largest hairs on upper leaf lobe near stem 2(--3)-celled; broad pedicel cell often 1/2 or more height of hair, apical cell curved, with tip nearly parallel to leaf surface. Megaspores not covered with raised angular bumps, pitted and sparsely covered with a few long filaments extending over surface.

Azolla mexicana is generally less cold tolerant and has a narrower environmental range than A . caroliniana . Both species are closely related and are similar vegetatively in culture. In the western United States, A . mexicana is often fertile. Distribution in the Great Plains area is tentative and needs further study. In the eastern United States, A . mexicana may have been occasionally introduced.


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