12 Rhodora [JANUARY 
the herbarium of Mr. Rich. The following plants seem particularly 
worthy of mention: 
Eragrostis minor, Host. This introduced grass is very abundant 
in the crevices and along the inner edge of the sidewalk, on Chandler 
Street, Boston, near Castle Square. I also collected it on the Central- 
ville dump in Lowell, in 1902. 
Allium tricoccum, Ait. I discovered the foliage of this plant in May, 
1906, in rich moist woods by Clematis brook, Waltham, near Asplenium 
acrostichoides, Sw. When I revisited the station on July 7 the leaves 
had withered and the flower-buds were beginning to open. There 
were hundreds of plants, and the large round heads of white blossoms 
were very conspicuous. The plant has also been collected in the 
neighboring Beaver Brook Reservation, by Mr. R. A. Ware. 
Allium vineale, L. I found a few plants of this species in the edge 
of a cultivated field on Rag Rock, Woburn. It is to be hoped that 
this pest will not prosper here, but remain an unusual plant. 
Quercus Prinus, L. A few trees grow in sandy soil on the shore 
of Little Quittacas Pond in Lakeville. It is very abundant in Sutton, 
Worcester county, where it is the predominant tree in the woods 
around Purgatory Chasm. It is also frequent in Webster and Dudley, 
but I have not seen it near Boston. 
Celtis occidentalis, L. Several trees grow in a pasture in Waltham, 
near Waverley. I found them first before the leaves came out, and 
visited them again the last of May, just as they were going out of 
blossom. The leaves and twigs seemed much diseased from the 
work of insect parasites. Small trees in better condition grow on Mt. 
Tabor in Lincoln (C. H. Knowlton and E. L. Shaw). 
Nasturtium sylvestre, R. Br. This rare crucifer is very plentiful 
around a green-house in Natick, where it seems thoroughly established. 
Potentilla fruticosa. L. One bush I have seen in a grassy swamp 
in Woburn, another larger in a similar place in Amesbury. In the 
northern part of Groton it grows in great profusion. This station 
was given by Mr. C. W. Jenks in the Middlesex Flora. 
Amphicarpaea Pitcheri, T. & G. I found this growing in consider- 
able abundance at Oak Island, Revere, where it was collected by Mr. 
Rich in 1893. (RHopora, i. 27.) In general appearance as well as in 
several minor details it is distinctly different from the common species. 
Later in the season it was found by Mr. H. H. Bartlett in great abun- 
dance on Horn Pond Mt. in Woburn, only a mile or two from Mr. 
