28 FLORA OF WORCESTER COUNTY. 



Oalla L. Water Arum. 



palustris L. In swamps, not rare. 



Symplocarpus Salisb. Skunk Cabbage, 

 fetidua (L.) Nutt. 



In swamps and wet places, common. 

 Orontium L. Golden Club, 



aquaticum L. 



Dudley; Princeton. 

 Acorns L. Sweet Flag. 



Calamus L. In swamps and low grounds, not rare. 



LEMNACE.E (DUCKWEED FAMILY). 



Spirodela Schleid. 



polyrhiza (L.) Schleid. In pools and ponds, common. 

 Lemna L. Duckweed. 



trisulca L. In shallow waters. 



Prof. G. E. Stone. 



minor L. In stagnant waters, common. 



ERIOCAULACE^E (PIPEWORT FAMILY). 



Eriocaulon (Gronov.) L. Pipewort. 



septangulare With. In ponds and on their shores. 



This is Eriocaulon septangulare of Withering, the plant referred 

 to in the following extract from the "American Journal of Science and 

 Arts," p. 290, vol. 28, 1859. 



"We are pleased to leam the curious fact that a humble yet peculiar 

 North American plant, which has somehow found its way to the Irish 

 and North British shores, may be said to have fixed the destiny of 

 the great Botanist (Robert Brown, called by Humboldt 'Botanicorum 



