1	"Dioecious; attached by short, tuber-like rhizomes; to coastal, wave-swept rocks; leaves generally tufted on rhizomes at nodes; fruit beaked, base with 2 horn-like lobes"	Phyllospadix
1	"Monoecious; attached by long, slender, creeping rhizomes to bottoms of bays, estuaries, generally deep waters below wave action; leaves not tufted on rhizomes; fruit +- not beaked, base +- truncate, unlobed"	Zostera