82 BOTANY OF MICHIGAN 



TYPHACEAE. Cat-tail Family 



Typha latifolia L. Common cat-tail. Cat-tail flag. Common through- 

 out in open swampy places. 



SPARGANIACEAE. Bur-reed Family 



Sparganium eurycarpum Engelm. Broad-fruited bur-reed. Borders 

 of small lakes, ponds and streams. Abundant. 



Sparganium diversifolium acaule (Beeby) Fernald & Fames. Stemless 

 bur-reed. In very wet open swampy places. Often abundant. 



NAJADACEAE. Pondweed Family 



Potamogeton natans L. Common floating pondweed. In ponds, on 

 borders of small lakes, on margins and in coves of streams. Often 

 abundant. 



Potamogeton epihydrus Raf. NuttalPs pondweed. In still or flowing 

 water throughout. Often abundant. 



Potamogeton amplifolius Tuekerm. Large-leaved pondweed. In 

 ponds and slow streams throughout. Often plentiful. 



Potamogeton heterophyllus Schreb. Various-leaved pondweed. In 

 ponds and slow streams throughout. Frequent. 



Potamogeton angustifolius Berchtold & Presl. Ziz's pondweed. In 

 ponds and small lakes and on margins of slow streams throughout. 

 Plentiful. 



F J otamogeton perfoliatus L. Claspingrleaved pondweed. In ponds and 

 slow streams throughout. Often plentiful. 



Potamogeton pusillns L. Small pondweed. In ponds and ditches. 

 Common. 



Potamogeton foliosus Raf. Leafy pondweed. In still and slow-flowing 

 water throughout. Plentiful. 



Potamogeton dimorphus Raf. Spiral pondweed. In still water and 

 on borders of slow streams. Plentiful. 



Najas flexilis (Willd.) Rostk. <fe Schmidt. Slender naias. In ponds 

 and slow streams. Often abundant. 



TUNCAGINACEAE. Arrow Grass Family 



Scheuckzeria palustris L. Scheuchzeria. Open boggy places through- 

 out. Noticed in particular near Vermilion in Chippewa County. 



Triglochin maritima L. Sea-side arrow-grass. Marshy open places 

 throughout. Plentiful. 



Triglochin palustris L. Marsh arrow-grass. Usually in damp open 

 sandy ground. Often abundant in damp sand along lake shores. 



