face; the summit of each marked with a trifid diverging elevated line. A genus probably restrained to a single species indigenous also to Europe and India. Size variable, from 2 to 12 inches, growing either immersed or on the margins of clear ponds; color green. 833. SALVINIA. Micheli. Willd. Indusia imbricate, connate, resembling an unilocular capsule. Seeds? inserted upon a central receptacle. Plant floating, small and pubescent; sending out, radicles from the joints; leaves opposite, petiolate, distichally disposed, ovate or partly cordate, entire and somewhat coriaceous, green. Fruit globular, in radical clus ters which are submersed; flowers? monoicous? SPECIES S. natans. + $34. AZOLLA. Lamark. Monoicous.-Masculine? appendices by pairs, contiguous.--Indusium subglobose, resembling an unilocular capsule. Proper capsules (seeds, Lamark) numerous, naked, minute. Minute floating plants, with greenish and very small distichally subimbricated leaves, radicles extra-axillar; utriculi, globose-ovate, axillar; masculine, or infertile processes by pairs contiguous to the fruit. SPECIES. 1. A. caroliniana, (*americana.) HAB. Throughout the southern and western states, probably to the sources of the Missisippi and Missouri. Of this genus there are 2 or 3 other species, and one of them indigenous to New Holland, in which species Mr. Brown, n the splendid illustrations to Flinder's voyage, appears to have ascertained, that the supposed capsule [of this genus is in fact a true sorus. THE END. |