21. The salvinia stem-borer moth is native to the United States and presents no threat to the environment. 22. A water fern of low wildlife utilisation value, the salvinia is later transported to a suitable site for composting. 23. The water level of Bistineau will be lowered after the Labor Day weekend in another effort to combat the salvinia . 24. The egg-beater hairs of " Salvinia molesta " and closely related species ( e . g. 25. Water hyacinth, giant salvinia and hydrilla all were purchased abroad and brought home to decorate aquariums or backyard water gardens. 26. Giant water fern ( " Salvinia molesta " ) is one of the world's worst aquatic weeds. 27. The Brazilian floating fern known as " Salvinia molesta " is now widely distributed in tropical and subtropical areas. 28. "Salvinia ", like the other ferns in order Salviniales are heterosporous, producing spores of differing sizes. 29. 01 : 11 Aug 7, 2002 Giantsalvinia . jpg " ( Giant salvinia to be used on the Polish Wikipedia) 30. The best known examples for long term air retention under water are the floating ferns of genus " Salvinia ".
