
ae 
107 
Var. angustifolia. 
_ Pleasant pond, Wenham. 
Var. gracilis. 
Georgetown (Mrs. Horner). 
Sagittaria heterophylla, Pursh. 
_ Shore of the Merrimac, Lawrence, two miles above the dam, north 
side, Aug. 5, 1879 (J. R., etc.). 
Sagittaria graminea, Miche. 
Borders of Wenham pond (J. R.). 
Forma fluitans, Engel. , 
With leaves two feet long collected in the Ipswich river by Mr. 
Sears. Similar specimens were found near Boston by Mr. E. H. 
_ Hitchings. 
HYDROCHARIDACESA. 
(FROG’s-BIT FAMILY. ) 
Anacharis Canadensis, Planchon. (WaATER-WEED.) 
Very common in some places, and undoubtedly to be found in the 
county, but no specimens are in the P, A. S. collection. 
Vallisneria spiralis, Z. (VALLISNERIA.) 
Frequent in ponds. A most interesting plant to study, the mode 
of fertilization being very curious. 
ORCHIDACEZ. 
(OrcHIS FAMILY.) 
Orchis spectabilis, Z. (Snowy Orcuis.) 
Not known within the exact geographical limits of the county, 
but growing quite near the line toward Chelsea, yet Dr. Bigelow 
who botanized in that region does not mention it. 
Habenaria tridentata, Hook. 
Essex, Beverly, Lynnfield (A. P. Chute), Salem Great Pastures 
(Tracy), Georgetown, Amesbury, North Andover. Scarce. 
Habenaria virescens, Spreng. 
Along brooks and in meadows, Georgetown (Mrs. Horner), etc. 
Not very common. It is quite probable that the species referred 
to as O. dilatata, Proc. E. I. Vol. II, p. 240, is either this or H. 
lacera. 
Habenaria Hookeri, Torrey. 
Found at Georgetown, June, 1874, by Mrs. Horner. It was ex- 
hibited among other native plants in Boston, at the Mass. Hort. Soc. 
rooms, at that date. 
