254 CRYPTOGAMIA. FILICES. 



face; the summit of each marked with a trifid diverging 

 ele^ ated line. 



A genus probably restrained to a single species indige- 

 nous also to Europe and (ndia. Size variable, from 2 to 

 12 inches, growing either immersed or on tlie margins of 

 clear pondsj color green. 



333. SALVINIA. Mlcheli. JFilld. 



Indnsia imbricate, connate, resembling an 

 unilocular capsule. Seeds? inserted upon a cen- 

 tral receptacle. 



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

 dicles from the joints; leaves opposite, j)Cliolate, distichal- 

 \y disposed, ovale or partly cordate, entire and some- 

 Avhat coriaceous, green. Fruit globular, in radical clus* 

 ters which are submersed; flowers? monoicous? 



SrECiES. S. natans. -f- 



SS4. AZOLLA. Lnmark. 



Monoicous. — Masculine? appendices by pairs, 

 contiguous. — Indiismm subglobose, resembling 

 an unilocular capsule. Proper capsules (seeds, 

 Lamark) numerous, naked, minute. 



Minute floating pjants, with greenish and very small 

 distichally subimbricated leaves, radicles extra-ax Uar^ 

 utriculi, globose-ovate, axillar; masculine, or infertile pro- 

 cesses by pairs contiguous to the fruit. 



Species. 1. A. carolinianay C*americana.J 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 



loi this genus is in fact a true sorus. 



THE END. 



