HOFFMANN: FLORA OF BERKSHIRE COUNTY. 205 
T. latifolia L. Cat-tail. — Borders of swamps and marshes, 
ditches; frequent. 
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 & 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. 
{Naias 111. Fl. ed. 2.) 
Najas flexilis (Willd.) Rostk. & Schmidt. — Ponds and slow 
streams; common in the valley, not noted on the plateau. 
POTAMOGETON. Poxdweed. 
P. alpinus Balbis. — Collected in Richmond in 1S04 by J. W. 
Robbins. Specimen in the Gray Ilcrbarimii marked " e ri\iilu prope 
viam ferream." 
P. americanus C. &. S. — In streams and outlets of lakes; fre- 
quent in the \alley. Stockbridge; New Marlboro; Shellield. 
P. amplifolius Tuckeiin.^ Ponds and sluggish streams; common. 
P. angustifolius Herchtold is: Presl. — Marsh, Egremont. 
P. bupleuroides I'ernald. — (/*. pcrfolidtus 111. Fl. vd. 2.) 
