19:5] Grover,— Extensions of Range 227 
which they grow have taken up much of the water. But other reasons, 
in the cases of such deep-rooted composites as Taraxacum, Cichorium, 
and Leontodon may be found in the facts that their roots reach well 
down into the soil after water and that their latex supply appears to 
hirider excessive transpiration, so that they are more independent of 
an abundant water supply than are most leafy, non-succulent plants. 
Along the borders of sidewalks and in the stone-paved gutters of 
Cambridge streets there is found a limited flora, consisting largely of 
small and somewhat xerophytic plants, among which are a few grasses, 
such as Eragrostis capillaris, Eragrostis Frankii, Poa annua, and a few 
otter species, which do not usually either flower or fruit. Other 
plants of frequent occurrence are, Polygonum aviculare, Mollugo 
veriicillata, Spergularia rubra, Euphorbia maculata, Euphorbia humi- 
strota, and Gnaphalium uliginosum, all small-leaved plants of little 
capacity for transpiration. Depauperate specimens of Plantago 
Rujelii are also abundant. The members of this sidewalk flora are 
for the most part no more conspicuous than usual this summer, though 
perhaps the grasses have fruited more successfully than they generally 
do. 
Summing up my own observations in the briefest terms, it may be 
said that many of our annual weeds and ruderal plants have profited 
greatly by the unusual water supply which they have received this 
summer and that in general, but not always, more than ordinary 
luxuriance has characterized those species which would a priori have 
been classed as large consumers of soil water. 
CAMBRIDGE, MASSACHUSETTS. 
EXTENSIONS OF RaxaE.— During a visit to Monhegan Island on 
the coast of Maine in the summer of 1911 the writer noticed, while 
hurrying from * Cathedral Woods" to the wharf to catch the boat to 
Boothbay, a few specimens of Carex crinita which had an unusual 
appearance. These were hastily gathered and upon later study 
proved to be C. crinita, var. Porteri (Olney) Fernald. It was not 
possible to return for further collections, so no information is at hand 
as to the distribution or abundance of this rare variety on Monhegan. 
Its raere occurrence on this oceanic island, lying isolated, twenty miles 
fron. the mainland, is sufficiently remarkable and interesting. The 
variety is based upon specimens collected by Dr. 'Thomas C. Porter, 
