Class XXI. Order III. 339 



seeding in size those of any species here mentioned. Ditches 

 and ponds. June, July. Perennial. 



CAREX LACUSTRIS. Lake Sedge. 



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

 drical, pedunculated ; fruit oblong, many nerved, beak- 

 ed, 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. 



395. SPARGAN1UM. 

 SFARGANIUM 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, sessile ; 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 

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



396. TYPHA. 



TYPHA LATIFOLIA. L. Water Flag. Reed Mace. 



Leaves somewhat ensiform ; 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. Stern five of six feet high, round, straight, and 

 smooth. The fertile flowers form a large, very compact, cylin- 



