42 PLANTS OF RUODE ISLAND. 



Order 88. NAIADACE^. 

 NAIAS, L. Naiad. 

 flexilis, Eostk. 



ZANNICHELLIA, Micheli. Horned Pond- Weed. 

 palustris, L. 



ZOSTERA, L. Eel-Grass, Wrack. 

 marina, L. 



RUPPIA, L. Ditch-Grass. 

 maritima, L. 



POTAMOGETON, Tourn. Pond-Weed. 



1. natans, L. 



2. Oakesianus, Robbins. Olney. 



3. Claytonii, Tuckerm. 



4. Vaseyi, Robbins. In herb. Olney. 



5. hybridus, Michx., var. . Westerly, &c. 



6. Spirillus, Tuck. Robbins ; Quidnessett, Bennett. 



7. lonchites, Tuck. (?) So. Kingstown. 



8. gramineus, L., var. graminfolius. 



var. heterophyllus. 



var. myriophyllus. Gorton's Pond. 



9. perfoliatus, L. 



10. compressus, L. 



11. pauciflorus, Pursh. Niantic, Ac. 



12. pusillus, L. 



13. gemmiparus, Robbins. Lonsdale, &c. 



14. pectinatus, L. 



15. Robbinsii, Oakes. Smithfield. 



16. Tuckermani, Robbins. 



(Our Potamogetons were kindly revised by Dr. Robbins a short 

 time only before his death; his last botanical work.) 



Order 89. ALISMACE^. 

 TRIGLOCHIN, L. Arrow Grass. 



1. palustre, L. 



2. maritimura, L. 



SCHBUCHZERIA. L. 

 palustris, L. N. Providence, Olney. 



A L I S M A , L. Water Plantain. 

 Plantago, L., var. Americanum. 



