42 PLANTS OF RHODE ISLAND. 
ORDER 88. NAITADACE A. 
NAIAS, L. Natrap. 
flexilis, Rostk. 
ZANNICHELLIA, Micheli. Hornep Ponp-WEEp. 
palustris, L. 
ZOSTERA, L. Eet-Grass, WRACK. 
marina, L. 
RUPPIA, L. DircH-Grass. 
maritima, L. 
POTAMOGETON, Tourn. Ponp-WEEpD. 
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. paucifiorus, Pursh. Niantic, &c. - 
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. ALISMACHA. 
TRIGLOCHIN, L. Arrow Grass. 
1. palustre, L. 
maritimum, L. 
SCHEUCHZERIA, L. 
palustris, L. N. Providence, Olney. 
ALISMA, L. WarTer PLANTAIN. 
Plantago, L., var. Americanum. 
