THE AMERICAN BOTANIST. 
29 
several species of Oxalis. The leaves were broken from the 
plants and the petioles buried in moist sand. In a few weeks sev- 
eral put forth roots, especially the younger leaves. Upon some of 
these roots, tuber-like bodies were formed, but it was not ascer- 
tained whether the leaves could be made to produce true bullDs and 
tubers as the plants ordinarily do. 
Origin of the No. 11 Mango. — In Jamaica, the mango is one 
of the most important of fruits and in its season furnishes a great 
part of the food supply of the negroes. The trees are now thor- 
oughly naturalized and the fruit is more or less varied in quality. 
The variety generally regarded as the best is known as the "No. 
II.'' Regarding the origin of the name, a note in the Btilletin of 
the Botanical Department of Jamaica has it that in 1782 a British 
ship captured a French vessel bound for Hayti which had on 
board man}- economic plants and seeds. The vessel with her 
cargo was sent as a prize to Jamaica and was thus instrumental in 
introducing the mango into that part of the world. The plants 
in the cargo were numbered and No. 1 1 w^as the mango that has 
since become famous. 
NoN-iNDiGiNOUs Flora OF Ohio. — Owing to various causes 
the flora of most areas is constantly, though slowly, changing. 
Sometimes this change is so rapid as to be noticed by the casual 
observer, as when a new weed suddenly spreads into new terri- 
tory. Few realize how many different species in any given lo- 
cality have appeared there since the country was settled. A 
pamphlet on the ''Non-indiginous Flora of Ohio," by Prof. W. A. 
and Mrs. Kellerman, notes that in Ohio there are 430 species of 
introduced plants, or nearly twenty-two per cent, of the whole 
flora. Of these 36 are shrubs or trees, 47 are grasses, and 49 are 
in the class which the farmer regards as weeds. The remainder 
are species mainly of interest to the botanist. A list of 40 native 
weeds is presented for comparison, and it is interesting to note 
that the worst weeds are all in the list of foreigners. 
