28* XX. 



Hoysradt Pond Marsh, S. end; Var. heterophyllus, Sub-var. 

 minor, Robbins, above outlet of Mud Pond. — P. lucens, L. ; 

 common in all our ponds, Stissing, Halcyon, Thompson, 

 Miller, etc., but Var. minor, is still more common. — P. prje- 

 longus, Wulfen ; rather common ; X. 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, etc., but 

 exceedingly variable. — P. pusillus, L. ; rather uncommon; N. 

 end of Mud Pond, etc. — P. pectinatus, L. ; not common ; X. E. 

 end of Thompson Pond ; X. part of Stissing Pond. — P. Rob- 

 binsii, Oakes; very common in some of our ponds, — Mud, 

 Halcyon, Stissing, Miller, etc. — 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^e. 



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. American um, Gray ; common. 



Sagittaria variabilis, Engelm. ; common, with Vars. obtusa, latifolia, 

 hastata (ordinary form), diversifolia, angustifolia and gracilis, 

 frequent. 



Hydrocharidace.e. 



Anacharis Canadensis, Planchon ; not common. 



Vallisneria spiralis, L. ; common ; Mud Pond. 



Orchidace^e. 



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 Iiotrichium 3fatriearkefolium, 

 and B. lanceolatum. — H. virescens, Spreng. ; abundant in 

 swamps southern part of Stissing Mt. — H. viridis, R. Br., Var. 

 bracteata, Reiohenb. ; 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 X. side of Little 

 Stissing, and in our wet cold woods. — H. Hookeri, Tori-.; 

 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 X. 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 7 destroyed by freshet. 



