35 
‘ 
Index to Recent American Botanical Literature. 
Alaskan Plants. F. H. Knowlton. (Bot. Gazette, xi., p. 340.) 
A list of 24 species collected by Mr. S. Applegate. The 
rare Carex decidua, Boott, is among the number. 
Ambrosia bidentata x trifida. Asa Gray. (Bot. Gazette, xi., 
P- 339.) 
A hybrid between these species has been found at St. Louis, 
Mo., by Mr. H. Eggert. 
Asimina triloba. (Lloyd’s Drugs and Medicines of North Amer- 
: ica, ii., pp. 49-60; one plate and cuts in the text.) 
Azolla Caroliniana—Note on. S. Henshaw. (Proc. Nat. Sci. 
Assoc., Staten Island, Dec. 11th, 1886.) 
“JT first noticed Azolla Carolinéana in our lotus pond, about 
two years ago, and have no doubt it came with some aquatic 
plants which I received from the South. It was.very interesting 
to me at first, looking like bits of floating moss, and apparently 
so frail that it was liable to be blown off the surface of the water. 
It turned out more able to take care of itself than I imagined, 
however, and the innocent-looking plant in a short time covered 
the whole surface, crowding out the more robust growing 
Nympheas and making sad havoc with all the permanent plants 
in the pond. It even tried to climb the stalks of the lotus, and 
eventually became such a pest that I tried to skim it off the sur- 
face of the water; but it appeared to grow all the faster. I 
turned the hose on it, and tried to float it off, but it is still here, — 
and I know of no way to get rid of it without non all the 
other aquatic plants in the pond. 
“ Thinking that it might make itself at home in some of the 
ponds and streams in the neighborhood, I threw a little of it in 
the shallow end of Silver Lake, Clove Lake, and along the edges 
of the swamps. This was on May toth, 1885. By July 5th of 
the same year it had spread amazingly, especially in the swamps 
at the head of Clove Lake, where, by autumn, it had covered 
every available inch of surface. Where fully exposed to the sun, 
it assumed a red or rusty appearance and gave rise to many in- 
quiries on the part of people in the vicinity as to what it was and 
how it came there. 
«« It thas evidently become more or less acclimated, as it 
