CLASS XXI. ORDER III. 363 



Carex lacustris. Lake Sedge. 



Barren spikes four ; fertile spikes two, erect, cylin- 

 drical, pedunculated; fruit oblong, many nerved, 

 beaked, forked, longer than the oblong, mucronate 

 scale. 



A very stout carex, three feet high, with commonly four bar- 

 ren spikes at top. Ditches and brooks, Roxbury. — May, June. — 

 Perennial. 



372. SPARGANIUM. 

 Sparganium ramosum. Sm. Burr Reed. 



Leaves triangular at the base, their sides concave ; 

 common flower stalk branched ; stigma linear. Sm. 



Readily distinguished from other Reeds and Flags, by the round 

 burrs or heads of flowers on its branches. The radical leaves 

 are three sided at base, erect, at length becoming sword shaped, 

 with rather obtuse points. Stem leaves concave and sheathing. 

 The stem is erect, round, and smooth, with several branches. 

 Heads of flowers alternate, sissile; the lowermost fertile, the 

 uppermost barren, smaller and more numerous. — In ditches at 

 Cambridgeport, and elsewhere. — July. — Perennial. 



Sparganium angustifolium. Mx. ? Narrow Sparganium. 



Leaves flat, narrow-linear, longer than the stem. 



Specimens are found in this vicinity, which answer generally 

 to Michaux's description, but not having seen them in deep wa- 

 ter, I am unable to say whether the leaves are ever floating. 



373. TYPHA. 

 Typha latifolia. L. Wafer Flag. Reed Mace. 



Leaves somewhat ensifortn : barren and fertile 

 spikes approximated. L. 



The Typha latifolia is an inhabitant of a great variety of cli- 

 mates and countries. It is common in deep waters, about the 

 margin of rivers and ponds. Leaves erect, linear-sword shaped 

 and very long. Stem five or six feet high, round, straight, and 



