1924] Knowlton,—Notes on the Plants of Hingham, Mass. 175 
MENTHA LONGIFOLIA Huds. Fl. Angl. 221. 1762. 
Mentha spicata 8. longifolia L. Sp. Pl. 2: 576. 1753. 
Mentha sylvestris L. Sp. Pl. ed. 2, 2: 804. 1763. 
MENTHA ROTUNDIFOLIA Huds. Fl. Angl. 221. 1762. 
Mentha spicata Y. rotundifolia L. Sp. Pl. 2: 576. 1753. 
BUREAU OF PLANT INDUSTRY, WASHINGTON, D. C. 
NOTES ON THE PLANTS OF HINGHAM, MASSACHUSETTS. 
CLARENCE H. KNOWLTON. 
WHEN the History of Hingham was published by the town in 1893, 
there was included in it “The Botany of Hingham," by Thomas 
T. Bouvé, and “The Trees and Shrubs of Hingham,” by his son, 
Edward T. Bouvé. Both of these men were long connected officially 
with the Boston Society of Natural History. Charles J. Sprague, 
the artist-botanist, coóperated with the elder Bouvé in the prepara- 
tion of the Flora, and local botanists also assisted. The list is based 
on the sixth edition of Gray’s Manual (1890). 
No less than 877 plants are given, making it a very complete list 
for an area of 12,973 acres. There seem to be very few errors, although 
many of the species have subsequently had their names changed, 
and there have been many new segregates since 1890. Since I came 
to Hingham in 1908, and since Dr. C. A. Cheever came in 1917, each 
of us has explored the town, and each of us has kept a check-list of 
the local flora. There are still many species which we have not checked 
off, but we have succeeded in finding many of the plants which were 
reported as rare, and we have added several new species, not merely 
segregates, to the known flora of the town. 
Five of the plants in the flora, Asclepias verticillata, A. tuberosa, 
Gentiana crinita, Sarracenia purpurea and Sporobolus asper are appar- 
ently extinct, and three others, Phragmites communis, Kalmia lati- 
folia and Epigaea repens are nearly gone, while Ilex opaca is making 
a hard fight against being eliminated by the Christmas spirit. 
Along the shore, in salt marsh openings, is an abundance of Sali- 
cornia ambigua, the perennial, along with the two annual species of 
the region. The young shoots of this plant, before they root into the 
sand, are curved, forming almost perfect circles for a few weeks be- 
