254 CRYPTOGAMIA. FILICES. 



face; the summit of each marked with a trifid diverghig 

 ele\ated line. 



A genus probably restrained to a sinple species indigfe- 

 nous also to Europe and India. Size variable, from 2 to 

 12 inches, growing either immersed or on the margins of 

 clear ponds; color green. 



853. SALVINIA. Micheli, mild. 



Tndnsia imbricate, connate, resembling an 

 iniilocular capsule. Seeds? inserted upon a cen- 

 tral rcC' ptacle. 



Plant floating, small and pubescent; sending out. ra- 

 dicles from the joints; leaves opposite, pctiolate, distichal- 

 ly disposed, ovate or partly cordate, entire and some- 

 what coriaceous, green. Fruit globular, in radical das'- 

 ters which are submersed; flowers? monoicous? 



Species. S. natans. -f- 



834. AZOLLA. Lamark, 



Monoicous. — Masculine? appendices by pairs, 

 contiguous. — Indusium sul)gl()bose, 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; ma«»cuHne, or infertile pro- 

 cesses by pairs contiguous to the fruit. 



Species. 1. A. caroUniana, f^americcina.J Hab. 

 Throughout the southern and western states, probably X.O 

 the sources of the .Missisippi and Missouri. 



Of this genus there are 2 or 3 other species, and one of 



them indigenous 'o New Holland, in which specich IVIrv 



Brown, \\\ ihe 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 



