STATISTICS OF METASPERMAE. 



743 



The progression of percentages from Monocotyledones to 

 Metachlamydea3, 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 natan«. 

 nsew. Potamogeton fluitans. 

 nseiv. Potamogeton amplifolius. 



nse. Potamogeton perfoliatus. 

 new. Potamogeton heterophyllos 



nse. Potamogeton gramineus var 

 zizii. 

 se. Potamogeton illinoensis. 

 nsew. Potamogeton pusillus. 

 new. Potamogeton rutilus. 

 nsew. Potamogeton pectinatus. 

 nsew. Potamogeton lucens. 

 new. Potamogeton praelongus. 

 nsew. Potamogeton lanceolatus. 

 «€w. Potamogeton zosteraefolius 

 new. Potamogeton foliosus. 

 nsew. Zanichellia palustris. 



Archichlamydeae. 



Najas flexilis. 



Elodea canadensis. 



Vallisneria spiralis. 



Zizania aquatica. • 



Panicularia fluitans. 



Scirpus fluviatilis. 



Scirpus lacustris. 



Ileleocharis palustris. 



Lemna minor. 



Lemna perpusilla. 



Lemna trisulca 



Lemna polyrhiza. 



Grantia brasiliensis. 



Grantia columbiana. 

 nse. Pontederia cordata. 

 sew. Heteranthera dubia. 



nsew. 

 nsew. 



se. 



se. 

 neio. 

 new. 

 nsew. 

 nsew. 

 nsew. 

 nse. 

 n.sew. 

 nseic. 



se. 



se. 



se. 



nseio. 



se. 



sew. 



nse. 



se. 



nsew. 



sew. 



new. 



nsew. 



se. 

 sew. 



new. 

 se. 



neto. Ranunculus aquatilis var. 



caespitosus. 

 new. Ranunculus circinnatus. 

 nsew. Stellaria verna. 



Hippuris vulgaris. 



Myriophyllum heterophyllum 



Myriophyllum verticillatum. 



Myriophyllum spicatum. 



nseto. 



se. 



se. 



nse. 



Polygonum hydropiperoides. 

 Polygonum amphibium. 

 "Nelumho nelumbo. 

 l^rasenia peltaia. 

 Leuconymphaea reniformis. 

 Leuconymphaea ordorata. 

 Nymphaea advena. 

 Cera tophy Hum demersum. 

 Ranunculus lacustris. 

 Ranunculus aquatilis var. 



trichophyllos. 



Metachlamydeae. 

 Nymphodeslacunosum. neio. Utricularia into media. 



Mimulus glabratus var. 7)eM5. Utricularia minor. 



jamesii. nsew. Utricularia vulgaris. 



Veronica anagallis. nse. Bidens beclcii. 



Utricularia cornuta. 



