Lake Maxinkuckee, Physical and Biological Survey 259 

 179. DOTTED WOLFFIA 



WOLFFIA PUNCTATA Griseb. 



With the other species, but not so common; characterized by 

 smaller size and numerous brown pigment cells. It is the smallest 

 of our flowering plants, though there is a still smaller species, 

 Wolffia microscopica, found in Asia. 



180. FLORIDA WOLFFIELLA 



WOLFFIELLA FLORIDANA (J. D. Smith) Thompson 



Rather common at Norris Inlet among other duckweeds. On 

 account of its slenderness and submerged growth, and its habit of 

 hiding among other duckweeds and among algae, it is easily over- 

 looked. The plants usually cohere to form star-shaped bodies. It 

 often grows thickly tangled in the tops of Ceratophyllum. South 

 winds frequently drive this with other duckweeds from their ac- 

 customed haven, and one finds stray bits at various places on 

 shore. On various occasions a few bits were found at Overmyer's 

 spring, a few south of Winfield's, and some near Farrar's, but they 

 do not appear to thrive or multiply in these places. This duckweed 

 remains green all winter and can be seen under the clear ice. 

 Plants were thus observed on December 20, 1904, floating along the 

 under side of the ice over the Inlet. 



In 1906 and again in 1909 when the Inlet was visited, this plant 

 appeared to be growing less common, as if disappearing. 



FAMILY 19. XYRIDACE^E. YELLOW-EYED GRASS FAMILY 



181. SLENDER YELLOW-EYED GRASS 



XYRIS FLEXUOSA Muhl. 



A rather remarkable and peculiar plant, the flowers aggregated 

 into dense heads on the tips of long slender scapes. Not common. 

 A few scattered plants were found in the wet sandy marsh near 

 the birch swamp along the railroad south of the lake. The plant 

 begins blossoming in early July. 



FAMILY 20. ERIOCAULACE^E. PIPEWORT FAMILY 

 182. SEVEN-ANGLED PIPEWORT 



ERIOCAULON SEPTANGULARE With. 



Not common in Lake Maxinkuckee ; only a small patch of plants 

 found on shore near the Assembly grounds. The basal rosettes 

 of leaves look much like those of Sagittaria graminea, and grow 



