234 Rhodora [DECEMBER 
Var. GRANDIS Blytt, Enum. Pl. vasc. Christ. 21 (1844). A. alpestris 
Schmidt, Fl. Boémica inchoata, Cent. III. 88 (1794); Lindb. fil. 
l. c. 127 (1909). A. vulgaris *alpestris Murbeck, Bot. Notiser (1895) 
266. A. vulgaris à alpestris Briquet in Burnat, Fl. Alp. marit. III. 
149 (1899).— Specimens examined. LABRADOR: l'Anse au Loup, 
August 21, 1892, Waghorne, Herb. Geol. Survey Canada, no. 8073. 
QuxnEc: Little Métis, August 15, 1898, Mrs. Brodie, Herb. Geol. 
Surv. Can., no. 19,513; J. Fowler, July 24, 1906. 
RARE PLANTS IN GROTON, MASSACHUSETTS. 
By CLARENCE H. KNowrToN. 
THE town of Groton lies in the northwestern part of Middlesex 
County, Massachusetts, the second town south of the New Hampshire 
line. It is full of most interesting glacial deposits. A series of 
eskers and kames obstruct the drainage in the eastern part of the 
town, and enclose a chain of kettle-hole ponds. In the center of the 
town is a group of large drumlins, almost perfectly symmetrical, and 
to the west the land slopes down into a broad sand-plain, through. 
which the Nashua and Squannacook Rivers flow, but little below the 
level of the plain. 
In general, the flora is of the dry-woods, sand-plain type, but the 
drumlins and adjacent land are more fertile. Here the chestnut is a 
common tree. I have found in Groton the following plants which are 
of special interest. Three of them I have already announced in a 
previous article (Ruop. IX, 11-15, 1907) but the additional informa- 
tion here may be of interest. - 
In September, 1905, I discovered a single plant of Linaria genistae- 
folia Mill. by the railway embankment half a mile above the village. 
No other specimens were in sight, and I supposed the plant to be a 
waif. On October 9 of this year, however, I was surprised to find 
several good specimens along the Willow Road near the railway sta- 
tion. Later in the day I found a large colony on both sides of the 
highway, and spreading into an orchard, near my original station. 
There were at least 150 plants here, all in good flower and fruit. This 
plant is given in the sixth edition of Gray's Manual on the basis of 
