724 METASPERMAE OF THE MINNESOTA VALLEY. 



the last fifty years, by the agency of man . It is intended also 

 to be exclusive of such North American species as have been 

 distributed abroad by other than the so-called agencies of 

 nature. The group of 317 species and varieties may be known 

 as the Extra- Continental specific element and may be isolated 

 for examination. In the following list the countries of extra- 

 continental distribution are noted for each species, and pre- 

 ceding each entry are given the letters which indicate the 

 intra-continental range of the species. The list is herewith 

 appended: 



E. List of Species and Varieties of Minnesota Valley Metas- 

 taspermae which are of Extra-Continental Range. 



Morvocotyledones. 

 nsew. Typha latifolia. EUR., ASIA, N. AFRICA. 



new. Sparganium simplex. EUR., SIB. 

 nsew. Potamogeton natans. EUR., As., AUST., AFR. 

 nsew. Potamogeton fluitans. EUR., As., AUST., AFR., S. AMJBR. 

 use. Potamogeton perfoliatus. EUR., As., AFR., AUST. 



new. Potamogeton heterophyllos. EUR., As. 

 nse. Potamogeton gramineus var. zizii. EUR., As. 

 nsew. Potamogeton pusillus. EUR., AFR., As., S. AMER. 



new. Potamogeton rutilus. EUR., As., AFR. 

 nsew. Potamogeton pectinatus. EUR., As., AUST. 

 nsew. Potamogeton lucens. EUR., As., AFR., AUST., W. INDIES. 



new. Potamogeton praelongus. EUR. 

 nsew. Potamogeton lanceolatus. EUR. 



new. Potamogeton zosteraefolius. EUR., As. 

 nsew. Zanichellia palustris. EUR., As., AFR., PHILIPPINES, AUST. 

 nsew. Najas flexilis. EUR., As., W. INDIES. 



new. Triglochin palustris. EUR., As., AFR., S. AMER. 



new. Triglochin maritima. EUR., As. AFR. 



new. Scheuchzeria palustris. EUR., As. 



new. Alisma plantago. EUR., As., AUST. AFR. 



new. Sagittaria sagittaefolia. EUR., As. 

 nsew. Elodea canadensis. EUR., As. 



se. Vallisneria spiralis. EUR., As., AUST. 

 se. Andropogon provincialis. FRANCE. 



sew. Cenchrus tribuloides. AFR., E. AND W. INDIES. 



se. Zizania aquatica. SIB., JAPAN. 

 nsew. Homalocenchrus oryzoides. EUR., As., AFR. 



new. Phalaris arundinacea. EUR., As. 



new. Hierochloe odorata var. fragrans. EUR., As. 



se. Muhlenbergia sobolifera. EUR. 

 nsew. Agrostis hiemalis. As. 

 nsew. Agrostis perennans. As.? 



nw. Deyeuxia neglecta. EUR., As. 



new. Deyeuxia canadensis. SIB. 



