208 Rhodora [NOVEMBER 
P. pusillus L., var. tenuissimus Mertens & Koch. Ponds and 
streams; eight scattered stations north and west of Boston. 
P. Robbinsii Oakes. Deep water of ponds and streams; reported 
from thirteen stations north and west of Boston. 
x P. spathaeformis Tuckerm. Mystic Pond, Medford; collected 
between 1865 and 1881 by Wm. Boott, E. Tuckerman, T. Morong and 
C. E. Faxon. See Fernald, Кнорока, viii. 224. 1906. 
P. strictifolius Benn. Mystic Pond (Wm. Boott, Aug. 13, 1865). 
P. Vaseyi Robbins. Mystic Pond (Wm. Boott, Aug. 6, 1865); Spot 
Pond, Stoneham (T. Morong, July 27, 1876; L. H. Bailey, Aug. 1, 
1883). 
P. zosterifolius Schumacher. Rivers and ponds; Cambridge, 
Canton, Lynnfield, Natick, Newbury, Wenham. 
RUPPIA. 
R. maritima L. Shallow brackish and salt water, along the coast. 
ZANICHELLIA. 
Z. palustris L. Brackish water, Ipswich; Mystic River and Mystic 
Pond, Medford, between 1865 and 1887; Squantum, Quincy; Revere; 
Salem. i 
Z. palustris L., var. pedunculata J. Gay. Seashore near Boston 
(L. H. Bailey, Aug. 25, 1883). 
ZOSTERA. 
Z. marina L. In shallow salt water, generally below low tide; 
common and abundant along the entire coast. 
JUNCAGINACEAE. 
SCHEUCHZERIA. 
8. palustris L. Bogs and ponds, Acton, Canton, Lynn, Natick, 
Peabody, rare. Wm. Boott collected this species at Tewksbury on 
June 23, 1853. Specimen in Gray Herb. 
