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are described in Koch, Fl. Germ. 2ud ed., p. 771, who gives 

 the generic character of the plant thus : ' Udora {Nuttall) 

 Flores dioici. Cal. tripart. Cor. tripetala, Mas. stam. 3. Fem. 

 styli tres, bifidi, stigmata elongata, plumosa (Flores masculas 

 nondum vidi).' I may here state that it has been thought 

 better to apply Richard's earlier name of Anacharis to the 

 plant instead of Udora. An allied species similar to that 

 found in Leicestershire has been sent by Mr. Mackay to Kew 

 Gardens, having been found in the neighbourhood of Dublin. 

 A similar plant has also been gathered by Mr. Collins, of 

 Chichester, from near Havant, pointed out to him by a 

 gardener, who has observed it, as Mr. Borrer heard, for seve- 

 ral years. Mr. Babington, however, states in a letter to me, 

 that it is in the opinion of a gardener close by, a recent 

 arrival : which of the two is correct ? Mr. Borrer has also 

 gathered it, as I hear, in Leigh Park, Hants : this probably 

 is the same locality as that near Havant. It was discovered 

 in Leicestershire, by Miss Kirby, of Lubbenham Lodge, in 

 the past summer, in some reservoirs adjoining Foxton-locks 

 on the canal near Market Harborough. She was kind enough 

 to accompany me to the place in October last, and I found 

 the plant in considerable abundance, particularly in the second 

 and third reservoirs, growing closely matted together, and the 

 upper portion floating on the water. She had not observed it 

 in previous years, and the reservoirs had been cleaned out 

 two years ago. The canal had been made about thirty years, 

 and the reservoirs (about a quarter of an acre in size) were then 

 formed for collecting the waste water from the upper locks 

 and conveying them to the lower ones. The only conclusion 

 I can come to in reference to its discovery in Leicestershire 

 and elsewhere is, that the seeds have long lain dormant in 

 the localities where it has been found, and that some peculi- 

 arity of the two past seasons has caused them to vegetate. 

 I find in a pond in my own neighbourhood that the Myrio- 

 phyllum allernifolium disappears altogether some seasons, and 



