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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118 FLOEA OF WASHINGTON AND VICINITV.<br />
*Sparganium simplex, Hudson, var. audrocladuia, Gray.<br />
July.<br />
,<br />
17aias flexilis. Eostk. Naiad.<br />
NA.IADACEiE.<br />
PoxDWEED Family.<br />
No liowers or fruit yet fotind on this plant.<br />
Potamogetou uataus L. Poxdweed.<br />
Eastern Brauch. Fruit, July.<br />
Potamogetou daytonii, Tuckerru.<br />
Difficult Eun. Fruit. July.<br />
Potamogeton hybridus, Michx.<br />
Pouds near tlie t-aual. below Great Falls. Fruit, July.<br />
Potamogeton loncliites, Tuckerm.<br />
Flowers iu August : fruit not collected.<br />
Potamogeton lucens, L.<br />
Seen iu the Potomac as late as October, but always without spikes and wholly<br />
submersed.<br />
tPotamogeton perfoliatus, L.<br />
Potomac. Fruit, July 2, 1876.<br />
Potamogeton pauciflorus, Pursh.<br />
P'XjIs among rocks at Little Falls. Fruit, July 13, 1879.<br />
Potamogeton pectinatus, L.<br />
Common in the Potomac, but as far as yet observed without tlowers or fruit.<br />
ALISMACE-aS.<br />
Watek-Plaxtaix Family<br />
^ Alisma Flantago, L.. var. Americanum, Gray. Water-Plaxtain.<br />
Under certain circumstances this plant presents floating leaves with long petioles<br />
and elliptical blades like the Potamogetons. July ; floating loaves in April or May.<br />
tSagittaria variabilis, Eug. Aurow-head.<br />
July to September.<br />
Sagittaiia variabilis, Eng.. Aar. angustifolia, Gray.<br />
Flats below Eads' Mill. A com])lete series may be collected in which the leaves<br />
vary in form from linear to ovate. September.<br />
f Sagittaria heterophylla. Pursh.<br />
First found under the Aqueduct in Foundry Run, but this locality is now de-<br />
stroyed ; since found on the Carberry Meadows. July to September.<br />
i^Sagittaria pusilla, Nutt.<br />
In the Potomac below Analostan Island, on muddy bars between tides. July,<br />
August; fruit, last of September.