Spermaphytes. 



Ranunculus. 



aquatilis, var. trichophyllus, Gray. 



multifidus, Pursh. 

 Brasenia peltata, Pursh. 

 Nymphea. 



odorata, Ait. 



odorata, var. minor, Sims. 

 Nuphar. 



advena, Ait. 



*Kalmianum, Ait. 

 Nasturtium officinale, R. Br. 

 Elatine Americana, Arn. 

 Myriophyllum. 



spicatum, L. 



verticillatum, L. 



ambiguum, Nutt. 



tenellum, Bigelow. 

 Proserpinaca palustris, L. 

 Callitriche. 



verna, L. 



*heterophylla, Pursh. 

 Decodon verticillatus, Ell. 

 Ludwigia palustris, EII. 

 Sium Carsonii, Durand. 

 Bidens Beckii, Torr. 

 Lobelia Dortmanna, L. 

 Limnanthemum lacunosum, Grisebach. 

 Utricularia. 



int^ata, Walt. 



*clandestina, Nutt. 



vulgaris, L. 

 « minor, L. 



gibba, L. 



intermedia, Hayne. , 



purpurea, Walt. 



*resupinata, B. D. Greene. 



cornuta, Michx. 

 Polygonum amphibium, L. 

 Ceratophyllum. 



demersum, L. 



demersum, var. echinatum. Gray. 

 Elodea Canadensis, Michx. 

 *Vallisneria spiralis, L. 

 Pontederia cordata, L. 

 Juncus militaris, Bigel. 



Typha latifolia, L. 

 Sparganium. 



eurycarpum, Engelm. 



simplex, Hnds. 



simplex, var.angustifolium, Engelm. 



simplex, var. androcladium, Engelm. 



minimum. Fries. 

 Peltandra undulata, Raf. 

 Spirodela polyrrhiza, Schleid. 

 Lemna. 



*minor, L. 



*trisulca, L. 

 Alisma Plantago, L. 

 Sagittaria. 



variabilis, Engelm. 



vartabilis, var. augustifolia. 



variabilis, var. obtusa. 



variabilis, var. gracilis. 



graminea, Michx. 

 *Scheuchzeria palustris, L. 

 Potamogeton. 



natans, L. 



natans, var. prolixus, Koch. 



Oakesianus, Robbins. 



Pennsylvanicus, Cham. 



Vaseyi, Robbins. 



Spirillus, Tuckerm. 



hybridus, Michx. 



fluitans, Roth. 



pulcher, Tuckerm. 



amplifolius, Tuckerm. 



heterophyllus, Schreb. 



heterophyllus, var. myriophyllus, 

 Robbins. 



perfoliatus, L. 



obtusifolius, Mer. & Koch. 



pauciflorus, Pursh. 



pusillus, L. 



pusillus, var. tenuissimus, Koch. 



pusillus, var. polyphyllus, Morong. 



germniparus, Robbins. 



Tuckermani, Robbins. 



Robbinsii, Oakes. 

 Naias. 



flexilis, Ros. & Schm. 



