Bulletin - United States National Museum - Smithsonian Institution
Bulletin - United States National Museum - Smithsonian Institution
Bulletin - United States National Museum - Smithsonian Institution
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Cyperus erythrorhizos, Muhl.<br />
FLORA OF WASHINGTON AND VICINITY. 125<br />
Custis Spring, September 29, 1878.<br />
Cyperus virens, Michx.<br />
Flats lielow Eads' Mill. First half of August<br />
Cyperus phymatodes, Muhl.<br />
This species invades the city and springs up in lawns, parks, &c., where the<br />
ground is somewhat moist. July to September.<br />
t Cyperus strigosus, L.<br />
Common. A depauperate form with very short (4'"), one to few flowered spikes<br />
probably belongs to this species. August, September.<br />
Cyperus Michauxianus, Schultes.<br />
Custis Spring. September 29, 1878.<br />
t Cyperus filiculmis, Vahl.<br />
June to August.<br />
Cyperus Lane astriensis, Poiter.<br />
Well defined forms of this sjjecies occur, but also sever al aberrant forms, apparently<br />
connecting it with C. retrojiexus. July to September.<br />
t Cyperus ovxilaris, Torr. Hedge-hog Club-Rush.<br />
July to September.<br />
t Cyperus retrofractus, Torr.<br />
Varies greatly in the length and size of the spikes, and perhaps the large-spiked<br />
forms should all be referred to C. Lancastriensis. July to September.<br />
IDxilichium spathaceum, Pers.<br />
Last half of July.<br />
tFuirena squarrosa, Michx. Umbrella-Grass.<br />
Holmead Swamp. July, August.<br />
tEleocharis quadrangulata, R. Br. Spike-Rush.<br />
Eastern Branch opposite the Race Course. July, August.<br />
tEleocharis obtusa, Schultes.<br />
Spikes variable in size. May to July.<br />
Eleocharis palustris, R. Br.<br />
May.<br />
Eleocharis compressa, SuUiv.<br />
Little Falls; Great Falls; in damp, rocky places. The descriptions of this species<br />
in the fourth and fifth editions of Gray's Manual differ in some essential respects,<br />
and our plant agrees better with the former. The achenium is triangular-obovate<br />
and conspicuously pitted with oblong depressions longitudinally arranged. Stigmas<br />
often 3. It seems to be intermediate between E. compressa aud E. rostellata. Middle<br />
to end of May.<br />
t Eleocharis tenuis, Schultes.<br />
First half of May.<br />
Eleocharis aciciilaris, R. Br.<br />
Bottom of dried ponds. June, July.<br />
.
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