Dr. J. E. Planchon on Anacliarijj and Apalaiithe. 85 
broad calycine segments ; three narrower, shorter, perhaps spa- 
thulate, coralline segments ; three broadly linear barren filaments ; 
and two long, greatly recurved, possibly emarginate, stigmas. 
The upper part of the plant to which one of the flowers is at- 
tached is exactly like a similar portion of A. Nuttallii from New 
Jersey, for which I am indebted to Sir W. J. Hooker, and I have 
no doubt that they are the same species. It is a curious coinci- 
dence, that the only perfect flowers of the Market Harborough 
A, Alsinastrum, and also of the Leigh Park A. Nuttallii which I 
have been able to examine, have no trace of more than two 
stigmas. 
Mr. Mackay accompanies specimens of the Dublin plant 
(found growing in a small pond in the garden of J. D’Olier, 
Esq., at Collignes near that city,) by the statement that it is 
in company with Ajjonogeton and other rare aquatic plants, and 
was in all probability introduced with them. Flowers have not 
been observed upon it, and its name must therefore remain 
doubtful — even its genus. In appearance it is almost exactly 
like A. Nuttallii, with which it agrees in having narrower and 
acuter leaves than A. Alsinastrum. 
The question now arises. May not the A. Alsinastrum have 
been introduced ? To this I answer in the words of the Rev. A. 
Bloxam, who kindly visited its place of growth and supplied me 
with numerous living and dried specimens. He says, in answer 
to an inquiry of mine, “ I can find no reason to doubt the JJdora 
being a true native. Numbers of other water-plants grow in the 
same locality, Potamogetons of various kinds, &c.^^ He adds, 
that “ although not observed until this year, I should suppose 
that it must have been a long period in the ponds from the great 
quantity of it.^^ 
Synopsis specierum Anacharidis et Apalanthes ; auctore 
J. E. Planchon, Scien. Doc. 
Anacharis, Richard. 
1. A. callitrichoides (Rich.); foliis oppositis vel ternis linearibus 
acutis minute serrulatis, spatha pedicello (brevi) cylindrico con- 
tinua sensim a basi ad apicem dilatata linear!- oblonga apice bifida, 
antheris (polline emisso) siccitate cserulescentibus, stigmatibus 
perianthii laciniis longioribus ad medium bifidis ; cruribus linea- 
ribus. 
Hab. in Brasilia australiori ; Montevideo, Commerson ; La Plata 
(absque loco proprio), Tweedie in Herb. Hooker. 
A. callitrichoides, Rich, in Mem. Inst. 1811, ii. 7. t. 2. 
Character e specimine Tweediano, quod floribus utriusque sexus 
gaudet, masculis, sicut folia, cum icone Richardiano plane congru- 
entibus, femineo unico et pro investigatione nimis imperfecto. 
