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Order 93.— NAIADACE^E. (Pondweed Family.) 



Naias, L. 



flexilis, Rosik. 

 Zannichelia, Micheli. 



palustris, L. 



POTAMOGETON, ToUm. 



natans, L. (Pondweed.) 

 compressus, L. 

 pectinalus, L. 

 pauciflorus, Fiirsh. 



Order 94.— ALISMACE^E. 



Alisma, L. 



Plantago, L. (Water Plantain.) 

 Sagittaria, L. 



variabilis, Engelm. (Arrow-head.) 



Order 95.— HYDROCHARIDACEiE. 



Udora, Nutt. 



Canadensis, Nutt. 



Order 96.— ORCHIDACE.E. (Orchis Family.) 

 LiPARis, Richard. 



liliifolia, Richard. 

 CoRALLORHizA, Hallcr. 



multiflora, Nutt. (Coral Root.) 



innata, R. Br. 



odontqrhiza, Nutt. 

 Aplectrum, Nutt. 



hyemale, Nutt. (Putty-root.) 

 Orchis, L. 



spectabilis, L. 

 Platanthera, Richard. 



peramoena, Gray. 

 PoGONiA, Juss. 



pendula, Lindl. 

 Spiranthes, Richard. 



gracilis, Big. 



cernua, Rich. (Ladies' Tresses.) 



