28* XX. 
Hoysradt Pond Marsh, 8. end; Var. heterophyllus, Sud-var. 
minor, Robbins, above outlet of Mud Pond.—P. lucens, 3 
common in all our ponds, Stissing, Halcyon, Thompson, 
Miller, etc., but Var. minor, is still more common.—P. pre- 
longus, Wulfen ; rather common ; N. W. of islands, Mud Pond; 
Stissing Pond.—P. perfoliatus, L.; rare in one or two of the 
ponds.—P. compressus, L.; quite common; abundant in Stis- 
_ sing Pond; Wappinger’s Creek, near Attlebury Station.—P. 
obtusifolius, Merts. & Koch.; rather scarce; Hoffman Mill 
Pond and old channel of Shekomeko, below the mill.—P. 
pauciflorus, Pursh ; very common in all our ponds, etce., but 
exceedingly variable.—P. pusillus, L.; rather uncommon; N. 
end of Mud Pond, ete.—P. pectinatus, L.; not common; N. E. 
end of Thompson Pond; N. part of Stissing Pond.—P. Rob- 
binsii, Oakes; very common in some of our ponds,—Mud, 
Halcyon, Stissing, Miller, ete.—For the correct determination 
of this genus, I am greatly indebted to Dr. J. W. Robbins of 
Uxbridge, Mass., who has kindly looked through a full suite of 
specimens from this district. 
ALISMACE, ° 
Triglochin palustre, L.; very rare; only a single specimen in 
Sackett’s Marsh. 
Scheuchzeria palustris, L. ; rare, but abundant about Bingham Pond 
on Mountain. 
Alisma Plantago, L., Var. Americanum, Gray ; common. 
Sagittaria variabilis, Engelm. ; common, with Vars. obtusa, latifolia, 
hastata (ordinary form), diversifolia, angustifolia and gracilis, 
frequent. : 
HyDROCHARIDACE &. 
Anacharis Canadensis, Planchon ; not common, 
Vallisneria spiralis, L.; common; Mud Pond. 
ORCHIDACE, ae 
Orchis spectabilis, L.; not scarce; Barton Woods, Mill Hill; Jno. 
A. Thompson Woods; abundant along stream above Harrietta 
Falls, Stissing Mt. 
Habenaria tridentata, Hook. ; frequent about swampy places, south- 
ern part of Stissing Mt., along East Ravine opening into Mul- 
berry Meadow Swamp, with Botrichium Matricaricefolium, 
and B. lanceolatum.—H. virescens, Spreng.; abundant in 
Swamps southern part of Stissing Mt.—H. viridis, R. Br., Var. 
bracteata, Reichenb.; very scarce; I have found only a few 
“specimens along a stream, on south-eastern part of Stissing Mt. 
—H. hyperborea, R. Br.; rather common on N, side of Little 
Stissing, and in our wet cold woods.—H. Hookeri, Torr. ; 
rather common, particularly on west side of Stissing Mt., under 
the hemlocks.—H. orbiculata, Torr, ; rare; Deep Woods, near 
Silvernail Falls.—H. lacera, R. Br. ; common; abundant in 
meadow, E. of N. end of Stissing Pond.—H. psycodes, Gray ; 
common in the wet meadows, and swamps, particularly on 
_ Stissing Mt.—H. fimbriata, R. Br. ; very rare; wet glade be- 
____ low Silvernail Falls, station now destroyed by freshet. 
