119 



those in a collection of I. Hparict by Commons at Newcastle, 

 Delaware (specimen in herb. Brooklyn Botanic Garden), with 

 traces here and there of a fine reticulum. The megaspores were 

 also a good match for the illustration of /. riparia by (lute. 1 

 Through the kindness of Dr. Pennell, I examined several sheets 

 (from the herbarium of the Philadelphia Academy of Sciences) 

 of /. saccharata from the Delaware region, named by Palmer. 

 These have megaspores with low crests conforming to the ac- 

 cepted characterization of /. saccharata. The question of specific 

 differentiation between I. saccharata and /. riparia remains as 

 indefinite as it was when Shull 2 discussed the problem, but the 

 Red Hook material apparently belongs with the deep-crested 

 phase known as /. riparia. The only species of Isoetes previously 

 recorded from the Hudson River appears to be /. Engelmanni 

 (Pfeiffer, Ann. Missouri Bot. Garden, 9: 204. 1922). Dr. Gleason 

 has kindly lent me the material at the New York Botanical 

 Garden representing the collection by LeRoy in 1868 from tidal 

 shores at Peekskill, but this collection has megaspores in too 

 young a stage to arrive at any definite conclusion as to the 

 species. The occurrence of Isoetes riparia w r as to be expected in 

 New York, since it has been recorded from New England and 

 from the Delaware and Passaic Rivers (Pfeiffer, I.e. p. 182). 



Eriocaulon Parkeri Robinson. This species, easily recog- 

 nized by the small blackish heads, occurred sparingly on the 

 tidal shores (no. 6463). It is confined to river estuaries from 

 Maine to Virginia (cf. Fassett, Proc. Boston Soc. Nat. Hist. 39: 

 99. 1928) and its occurrence at Stony Creek makes the plant 

 a new record for New York. 



Polygonum sagittatum f. chloranthum Fernald,(Rhodora 

 19: 134. 1917). The green-flowered form was described from the 

 tidal mud-flats at Bowdoinham, Maine, but it is also common, 

 according to Fassett (I.e., p. 107), on the estuaries of the Mer- 

 rimac and Connecticut Rivers. It is ordinarily submerged at 

 high tide, and in the specimens collected by us at Stony Creek 

 (no. 6444) was characterized by a conspicuous large petal- 

 like calyx which reached a length of 4.5 and even 5 mm. The 

 calyx of the common pink form averages 3.7 mm. and in no speci- 



1 The Fern Allies, New York 1905 (p. 239). 



2 Bot. Gazette 36: 200. 1903. 



