1922] 



PFEIFFER — MONOGRAPH OF THE ISOETACEAE 183 



collector (Mo. Bot. Gard. Herb.); margin of the Delaware, 

 opposite Philadelphia, October, 1868, ex. herb. Thurber 

 (Gray Herb.) ; shore of the Delaware, between high and 

 low water mark, Camden, 7 October, 1877, Parker (Gray 

 Herb.) ; Fish House, Delair, 19 August, 1906, Poyser (Mo. 

 Bot. Gard. Herb.). 



Delaware: shores of the Delaware River, 4 mi. above Wilming- 

 ton, July, 1860, Canby (Mo. Bot. Gard. Herb.) ; shores of 

 the Delaware, near low water mark, Newcastle Co., 1862, 

 Canby (Mo. Bot. Gard. Herb.) ; shores of the Delaware 

 River near Wilmington, 1865, Canby (Gray Herb.) ; Wil- 

 mington, 29 June, 1866, Canby (Gray Herb.) ; banks of the 

 Delaware, between high and low water mark, 14 September, 

 1866, Commons (Mo. Bot. Gard. Herb.); Wilmington, 25 

 September, 1866, Canby (Gray Herb.); gravelly shores, 

 Delaware River, between high and low water mark, near 

 Wilmington, 11 July, 1866, Commons (Mo. Bot. Gard. 

 Herb.) ; muddy shores of the Delaware River near Wilmin 

 ton, August, 1867, Canby (Mo. Bot. Gard. Herb.); Wil- 

 mington, 12 June, 1867, Canby (Mo. Bot. Gard. Herb.); 

 Wilmington, 1882, Canby (Mo. Bot. Gard. Herb.); river 

 shore below Claymont, 22 June, 1836, Commons (Mo. Bot. 

 Gard. Herb, and Gray Herb.) ; Delaware River, 1905, Palm- 

 er (Mo. Bot. Gard. Herb.). 



Pennsylvania: inundated by tides, shores of Delaware River, 



Gibsonville (Philadelphia), 22 August, 1815, Nuttall (Mo. 

 Bot. Gard. Herb.); Philadelphia, without date, Eaton ex. 

 herb. Thurber (Gray Herb.) ; gravelly shorei of the Dela- 

 ware, near Philadelphia, August, 1844, Zantziger (Mo. Bot. 

 Gard. Herb.), type; Philadelphia, October, 1848, Durand 

 (Mo. Bot. Gard. Herb.) ; banks of the Delaware, Philadel- 

 phia, July, 1860, James (Mo. Bot. Gard. Herb.) ; tidal mud, 

 Tinicum to 11 mi. below Philadelphia, August, 1864, Smith 

 (Mo. Bot. Gard. Herb.); banks of Delaware River near 

 Philadelphia, 18 June, 1806, Durand (Mo. Bot. Gard. Herb, 

 and Gray Herb.); Delaware River, August, 1894, Palmer 

 (Mo. Bot. Gard. Herb.) ; banks of Lehigh River, on an is- 

 land near Bethlehem, in sandy mud of river among and 

 between stones, 1866, Durand (Mo. Bot. Gard. Herb, and 

 Gray Herb.) ; along shaded bank of Lehigh River near Beth- 





