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152 Rhodora [SEPTEMBER 
as Rubus triphyllus Thunberg, а species from Japan. It is still 
flourishing the present year. 
Another Rubus growing here has for several years greatly interested 
me. It is а coarse-leaved prostrate plant but with the inflorescence 
and fruiting racemes of the high-bush blackberry, Rubus argutus 
Link. It seems to answer very well to the description of Rubus 
villosus Ait., var. humifusus T. & G. of Gray's Manual. 
In this month the Russian thistle, Salsola Kali L. var. Tragus 
Мод., begins to show itself and is more characteristic in its early 
stages and differs more from its close relative, the seashore species, 
than it does later in the season. Sisymbrium altissimum L., a com- 
paratively recent immigrant to this part of the country, is also becom- 
ing abundant and will be very much in evidence, especially in its later 
stages of development as a “tumble weed,” for the rest of the season. 
The July list could be greatly extended by the inclusion of many 
species that are common outside of the city as well as here, and I shall 
mention only those in which I have been particularly interested or 
which are of sufficient importance for botanical record. 
Lysimachia vulgaris L. grew abundantly at one time in a vacant 
lot near where now stands the Institute of Technology on Boylston 
Street, and not far away from it was a little colony of Euphorbia 
marginata, Pursh. Heracleum villosum Fisch., probably thrown out 
from the Park, has taken possession of several corner lots and is one 
of the most conspicuous plants in the entire region. Echinops sphae- 
rocephalus L., the globe thistle, and Polygonum cuspidatum S. & Z., 
also outcasts from the Park, appear to be happy and thriving in their 
new locations on the gravelly banks and can be found in many different 
places. A few plants of Genista tinctoria L. were seen in 1906 and in 
the same season Mr. С. Н. Knowlton called my attention to Epilobium. 
hirsutum L. which he had discovered in one of the lots. 
Another interesting find made July 18, 1906, in company with Mr. 
Knowlton, was a single plant of Polygonum arenarium W. & К. This, 
as far as I can learn, is the first published report of this species in 
Massachusetts, although a specimen I collected in July, 1899, on the 
South Boston flats appears to be the same. Brassica Sinapistrum 
Boiss. and Brassica juncea Cosson both grow here, the latter species, 
however, much more abundant. 
The list for August is a long one in my records and must be abbrevi- 
„ated here. Sida Napaea, Cav. with its white flowers and maple-like- 
