84 Mr. C. C. ]>abington on Anacharis Alsinastrum. 
leaves, upper scarcely lialf their length ; the node marked by a 
transverse dull red line. Roots long, threadlike, diaphanous, 
from the points at which branches have sprung. — Female flowers 
from the axils of the upper whorls, solitary. Sheaths sessile, 
solitary, linear, slightly enlarged at the end, deeply bifld. Flower 
sessile ; tube very long (so as to reach the surface of the water). 
Aliform ; limb six-parted ; divisions oval, similar, three exterior, 
three interior rather narrower and more acute. Filaments three, 
subulate, without anthers. Style adnate to the tube; stigmas 
ligulate, reflexed, notched, fringed. — Male flowers unknown. 
A. Nuttallii (Planch.), Udora canadensis (Nutt.), from New 
Jersey, closely resembles this, differing in the acute termina- 
tion of its leaves, and apparently its less deeply divided sheath : 
its flowers are not in a state admitting of examination. A. 
canadensis (Planch.) has lanceolate-linear leaves and a much 
shorter sheath. The latter differs from the former by not 
having any inner divisions to the perianth of its male flowers. 
Our plant is clearly not A, canadensis, but it may be A. Nuttallii, 
the want of male flowers totally preventing its absolute determi- 
nation. As the genus Anacharis is, as yet*, confined to the 
American continent, it has been thought better to give a di- 
stinctive name to our plant (derived from its resemblance to Ela- 
tine Alsinastrum), so as to prevent its being confounded with the 
American species, and thus extending their range far beyond 
what may prove to be their natural limits. Should either of them 
eventually be shown to be identical with our plant, one of the 
names will of course drop ; and as that species to which ours is 
the most nearly allied is now for the first time distinguished 
from the Elodea canadensis of Michaux, it will then be for bota- 
nists to determine which name should be retained. 
Shortly after receiving this plant from Mr. Bloxam, I was in- 
formed that similar ones had been found in Hampshire and near 
Dublin. I am indebted to my friend Mr. H. Collins for a speci- 
men from the former locality, an ornamented pond, at Leigh Park, 
about eight miles from Chichester. He informs me that there 
is very great probability of its having been introduced there ac- 
cidentally with the roots of Nymphcea odorata, received by the 
gardener a few years since from America. The plant had not 
been noticed in the pond previously to those roots being put into 
it, and it appeared shortly afterwards in small quantity, but 
soon rapidly increased. Mr. ScotC the intelligent gardener at 
Leigh Park, has sent three female flowers to Mr. Collins and 
Mr. Borrer, one of which I have examined carefully. It has three 
* Tlie Udora pomeranica and U. lithuanica of European authors have 
never been seen in flower, and have much more the look of Hydrilla than 
Anacharis, but tlieir genus is at present undeterminable. 
