333 PRACTICAL BOTANY. 



ORDER OXIV. 



lemnace^, oe duckmeats. 

 Genus : 



1. Lemna, L. Duckweed. Duck's- meat. Species 5. 



ORDER OXV. 



NAJADACEJB, OB NAJADS. 

 (lEKEEA : 



1. NajaSflj. Najad. Species: Najm flexUis, Rostk. 



2. Zanichellia, Micheli. Horned Pondweed. Species : 



ZanicheUia palustris, L. 



3. Zostera, L. Grass-wrack. Eel-grass. Species: 



Zostera marina, L. 



4. Huppia, L. Ditch-grass. Species : 



Huppia maritima, L. 



5. Potamogeton, Tourn. Pondweed. Species 12. 



ORDER CXVI. 



ALISMACE^, OE WATEE-PLANTAINS. 



1. Triglochin, L. Arrow-grass. Species 2, 



2. Scheuchzeria, L. Species: Scheuchzeria palustris, L. 



3. Alisma, L. Water-Plantain. Species: 



Alisma Plantago, L. Fan Americanum. 



4. Echinodorus, Rich. Species 3. 



5. Sagittaria, L. Arrow-head. Species 5. 



ORDER CXVII. 



HYDEOCnAEIDACE^, OE ITROGBITS. 

 (xENEEA : 



1. imwo5«MOT, Richard. American Frog's-bit. Species: 



Limnohium Spongia, Rich. 



2. Anacharis, Rich. "Water-weed. Species: 



Anacharis Cawac7ew5js, Planchon., 



3. Fa^^»«7jma, Micheli. Tape-grass. Eel-grass. Species: 



Vallisneria spiralis, L. 



