HOFFMANN: FLORA OF BERKSHIRE COUNTY. 205 



T. latifolia L. Cat-tail. — Borders of swamps and marshes, 

 ditches; fre(iiient. 



SPARGANIACEAE. BUR-REED FAMILY. 

 SPARGANIUM. Bur-reed. 



S. americanum Xutt. — Muddy shores; frequent. 



var. androcladum (Engelm.) Fernald & Eames. — (<S. andro- 

 clachim 111. Fl. ed. 2.) Occasional with the type. 



The validity of this variety is questioned by Blake (Rhodora, 15: 

 157, 1913). 



S. angustifolium Michx. — Ponds and slow streams; frequent. 



S. diversifolium Graebner. — Wet, roadside ditches on the plateau, 

 brooks, swales, and muddy shores; common. 



var. acaule (Beeby) Fernald & Fames. — (8. acaule 111. Fl. ed. 2.) 



Common on the plateau. 



S. eurycarpum Engelm. — Borders of ponds and rivers at low 

 altitudes; common along the Housatonic River. Not noted on the 

 plateau. 



S. fluctuans (Morong) Robinson. — Upland ponds; occasional. 

 Basin Pond, Becket; Shaw Pond, Otis; near East Pond, New Marl- 

 boro. 



S. minimum Fries. — Border of swamp, Stockbridge, 



NAJADACEAK. PONDWEED FAMILY. 



NAJAS. 



{Naias 111. Fl. ed. 2.) 



Najas flexilis (Willd.) Rostk. & Schmidt. — Ponds and slow 

 streams; common in the valley, not noted on the plateau. 



POTAMOGETON. Pondweed. 



P. alpinus Hali)is. — ('(illeeted ill Richmond in 1864 by J. W. 

 Rol)bins. Specimen in the Gray Herbarium marked " e rivulo prope 

 viam ferream." 



P. amiericanus C. &. S. — In streams and outlets of lakes; fre- 

 quent in the valley. Stockbridge; New Marlboro; Shellield. 



P. amplifolius Tuckerm. — Ponrls and sluggish streams; common. 



P. angustifolius iJerchtold & Pre.sl. — Marsh, Egreinont. 



P. bupleuroides Fernald. — {P. pcrfoliatus 111. Fl. rd. 2.) 



