HOFFMANN: FLORA OF BERKSHIRE COUNTY. 205 



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

 ditches; frequent. 



SPARGANIACEAE. BUR-REED FAMILY. 

 SPARGANIUM. Btjh-hbbd. 



S. americanum Nutt. — Muddy shores; frequent. 



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

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



The validity of this variety is questioned by Blake (Rhodora, 16 : 

 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 & Eames. — (S. 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. 



NAJADACEAE. PONDWEED FAMILY. 



NAJAS. 



{Xaias 111. FL ed. 2.) 



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

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



POTAMOGETON. Pondwbbd. 



P. alpinus Balbis. — Collected in Richmond in 1864 by J. W. 

 Robbins. Specimen in the Gray Herbarium marked " e rivulo prope 

 viam ferream." 



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

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



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



P. angustifolius Berchtold & Presl. — Marsh, Egremont. 



P. bupleuroides Fernald. — (P. •perfoliatus 111. Fl. ed. 2.) 



