Wolffia LEMNACEAE— ERIOCAULACEAE Eriocaulon 



Pennsylvania Railroad just north of bridge over Shellpot Creek, 

 n. e. of Wilmington, R. R. Tatnall, 2993, 30 June 1936 (T, P, A, G) ; 

 Dragon Marsh, ^ mi. s. w. of Delaware City, R. R. Tatnall, 3228, 

 14 Nov. 1936 (T, A) ; pond in railroad yards at Landlith, Wilming- 

 ton, R. R. Tatnall, 3428, 29 June 1937 (T). 



W. punctata Griseb. 



One station: floating on small ponds back of the dunes, on 

 property of Rufus P. Custis, Savage Neck, 4 mi. \v. s. w. of East- 

 ville (No), Fernald, Long & Fogg, 5251; R. R. Tatnall, 3209, 18 Oct. 

 1936 (T, P, G). 



This and the preceding species, floating globules about 1 mm. in 

 diameter, are the smallest known flowering plants; not blooming, 

 however, in our area, as far as is known. 



Wolffiella Hegelmeier. 



W. floridana (J. D. Smith) Thompson. 



There are two known stations on this Peninsula: smallest of the 

 Custis Ponds, 4 miles w. s. w. of Eastville (No), where it forms 

 floating mats two inches or more thick ; Fernald, Long & Fogg, 5252, 

 in 1935 (G, P), R. R. Tatnall, 3387, 1 June 1937 and 3763, in 1938 

 (T, A) ; edge of Dragon Marsh, ^ mile s. w. of Delaware City (NC), 

 where it is associated with Wolffia columbiana, R. R. Tatnall, 3229, 

 14 Nov. 1936, and several later numbers (T, G, A, P). 



ERIOCAULACEAE (Pipewort Family) 



Eriocaulon L. Pipewort. 

 E. decangulare L. 



Frequent; pine-barren swamps, river margins and seashore 

 sands. Our specimens are chiefly from Sussex County, including 

 one by Nuttall in 1809. Mid-July to Sept. 



E. compressum Lam. 



Rather frequent; pine-barren swamps, Sussex and Wicomico 

 Counties. Late May to Aug. 



E. septangulare With. (E. articulatum, in part, of Gray's Man., 



ed. 7.) 



Borders of fresh-water ponds; frequent in the central part of the 



Peninsula; one collection from New Castle County: shore of the 



Delaware River, Canhy, Aug. 1877 (D). Mid-July to early Sept. 



[75] 



