892 General Notes. [ December, 
Chenopodiacee. 
Chenopodium urbicum ? Chenopodium album, 
sd ambrosioides, Atriplex patula, var. hastata. 
' botrys, 
Amarantacee. 
Amarantus caudatus, Amarantus retroflexus. 
7 albus, 
Polygonacee. 
Polygonum orientale, Polygonum pennsylvanicum, 
s persicaria, n dumetorum, var scandens 
hydropiper, n sagittatum, 
bed acre, „Rumex crispus, 
“ aviculare, var. erectum, « — acetosella. 
Euphorbiacee. 
Euphorbia mcculata, Acalypha virginica. 
Cannabinee. 
Cannabis sativa, 
Smilacee, 
Smilax rotundifolia. 
Cyperacee. 
Cyperus strigosus, 
Filices. 
Aspidium spinulosum ? * Onoclea sensibilis. 
The great body of the recently introduced plants are made up 
of the Amaranths, Chenopodia, Ambrosiæ, Atriplex, Polygona, 
especially P. orientale, Erigeron, and Datura. These attained sur- 
prising proportions, and both in size and numbers resembled 
diminutive forests. Many of the wilder species doubtless were here 
previous to its present occupancy, and the water-loving plants 
remained in the moist precincts of the old partially obliterated 
pond. The Graminez, about five species, were omitted.—Z. P. 
Gratacap. i 
A Disrermous Acorn.—lIn a collection of acorns of Quercus 
prinus Linn. var. monticola Michx., found near Diamond Hill quar- 
ry, R. I., I noticed one much larger than the others, which were all 
large, even for the species. I put these acorns ina little paper 
box in a drawer which I keep for such fruits. In a few days the 
warmth of the room caused it to germinate, when I noticed two 
radicles protruding. [ then removed the acorn to a bit of per- 
. forated cardboard above a tumbler of water, and watched the 
growth. Afterwards I made a dissection and found, as I expected, 
two equally. developed seeds, each separable into its own two 
cotyledons, as shown by the accompanying’ figures. It will be 
_ remembered that the ovary of the oak is three-celled and six- — 
ovuled, and that in ripening only one cell remains, and this is- 
_ filled by one seed. Here two have been equally developed. 
_ find in Masters’ Teratology the same thing recorded of Corylus, 
but nothing is said of Quercus, hence it may be well to record 
_ this instance. This phenomenon must not be confounded with . — 
- poly-embryony, r multiplication of embryos in oxe seed, as iñ 
_ Citrus. In this case while we see an abnormality indeed, it 
