Dr. J. E. Planchon on Anacharis and Apalanthe. 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 Aponogeton 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 Udora 

 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 j^eclicello (brevi) cylindrico con- 

 tinua sensim a basi ad apicem dilatata lineari-oblonga apice bifida, 

 antheris (polline emisso) siccitate cserulescentibus, stigmatibus 

 perianthii laciniis longioribus ad medium bifidis ; cruribus linea- 

 ribus. 

 Hob. 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. 



