MEMORANDA. 25 
dener, has brought up specimens of living plants (both flowering stocks and 
young seedlings) from Tewkesbury, Massachusetts, where the plant occurs 
rather abundantly over about half an acre of rather boggy ground, along with 
Andromeda calyculata, Azalea viscosa, Kalmia angustifolia, Gratiola aurea, 
etc., apparently as much at home as any of them... . It may have been intro- 
duced, unlikely as it seems, or we may have to range this Heath with Seolopen- 
drium officinarum, Sabularia aquatica, and Marsilea quadrifolia, as species of 
the Old World so sparingly represented in the New, that they are known only 
at single stations,—perhaps late-lingerers rather than new-comers.— Asa Gray, 
in Silliman's Journ, xxxiii. (1861) 290. 
. ARUM CANARIENSE FOR MAKING ARROW-ROOT.—We noticed in the An- 
nual Report of the Acclimatization Society a short notice of an Arw suited 
making arrow-root and producing lucrative returns to the cultivator. As 
considerable doubt existed as to the correct botanical name of the plant, we 
applied to H. M. Sheriff, in Guernsey, and received a speci which Dr.Schott, 
of Vienna, the greatest authority on Aroidee, declared to be Arum Canariense, 
peculiar to Madeira and the Canary Islands, but hitherto unknown to him from 
the Azores. We further learn from Mr. Martin's letter, dated Guernsey, Jan. 6, 
1863, that he made about three hundred pounds of arrow-root last summer, 
and that the Arum Canariense is now perfectly naturalized in Guernsey ; also 
that he forwarded roots to the Crystal Palace Company, the Kensington 
Museum, and the Acclimatization Society. 
Azores, and given to a brother-in-law of mine, as a plant producing arrow-root. 
at once determined to try its powers of enduring our climate; and I have 
found it perfectly hardy, bearing well the severest of our winters. Growing, 
