STATISTICS OF METASPERMAE. 



743 



The progression of percentages from Monocotyledones to 

 Metachlamydese, as read in the last columns of the three pre- 

 ceding tabulations, gives interesting testimony to the correct- 

 ness of the views (by no means new) that are presented in the 

 paragraphs above. As compacted below this progression is 

 certainly instructive. 



The differences are widest between the monocotyledonous 

 and least between the archichlamydeous percentages. 



The three habitat- elements may now be considered. In 

 Table J is listed the aquatic element. 



J. Table of Aquatic Metaspermae Indigenous to the Minne- 

 sota Yalley. 



Monocotyledones. 



nsew. Potamogeton natans. 

 nsew. Potamogeton fluitans. 

 nsew. Potamogeton amplifolius. 



use. Potamogetou pert'oliatus. 

 new. Potarnogeton heteropbyllos 



nse. Potamogeton grarnineus var 



zizii. 



se. Potamogeton illinoensis. 

 nsew. Potamogeton pusillus. 

 new. Potamogeton rutilus. 

 nsew. Potamogeton pectinatus. 

 nsew. Potamogeton lucens. 

 new. Potamogeton praelongus. 

 nsew. Potamugeton lanceolatus. 

 new. Potamogeton zosteraefolius 

 new. Potamogeton foliosus. 

 nsew. Zanichellia palustris. 



A rchichlamydeae . 



nsew. Najas flexilis. 

 nsew. Elodea canadensis. 



se. Vallisneria spiralis. 



se. Zizania aquatica. 

 new. Panicularia fluitans. 

 new. Scirpus fluviatilis. 

 nsew. Scirpus lacustris. 

 nsew. Heleocharis palustris. 

 nsew. Lemna minor. 



nse. Lemna perpusilla. 

 nsew. Lemna trisulca 

 nsew. Lemna polyrhiza. 



se. Grantia brasiliensis. 



se. Grantia columbiana. 

 nse. Pontederia cordata. 

 sew. Heteranthera dubia. 



se. Polygon um hydropiperoides. 



new. Ranunculus aquatilis var. 



caespitosus. 



new. Ranunculus circinnatus. 

 nsew. Stellaria verna. 

 nsew. Hippuris vulgaris. 



se. Myriophyllum beterophyllum 

 se. Myriophyllum verticillatum. 

 nse. Myriophyllum spicaturn. 



nsew. Polygonum amphibium. 



se. "Nelumbo nelurnbo. 

 sew. Brasenia peltata. 

 nse. Leuconymphaea reniformis. 

 se. Leuconymphaea ordorata. 

 nsew. Nymphaea ad vena. 

 sew. Cera tophy Hum demersum. 

 new. Ranunculus lacustris. 

 nsew. Ranunculus aquatilis var. 

 trichophyllos. 



Metachlamydeae. 



se. Nymphodeslacunosum. new. Utricularia intermedia, 



sew?. Mimulus glabratus var. new. Utricularia minor. 



.jamesii. nsew. Utricularia vulgaris. 



new. Veronica anagallis. nse. Bidens beckii. 



se. Utricularia cornuta. 



