83 
a supposed new British Plant. 
cal)'ciiils ovato -oblongis ; interioribus petaloideis linearibus, aut 
nullis. Stamina 9 ; filaraenta basi in columnam brevem connata ; 
anthercE oblongae, basi affixae, loculis connectivo angusto sejunctis. 
— Fem. Spatha tubulosa, ore paululnm dilatato bifido obliquove, uni- 
flora. Perigonii tubus filiformis, elongatus ; limbus sexpartitus, 
laciniis ovalibus, conformibus, exterioribus calycinis, interioribus 
petaloideis. Staminodia tria, laciniis exterioribus opposita, subulata ; 
antheree nullse. Ovarium inferum. Stylus setiformis cum perigonii 
tubo connatus ; stigmata tria, bifida vel emarginata. Bacca sub- 
trigona, unilocularis, oligosperma. — Herbee perennes (vel annuae, 
Rich.)^, aquaticse, caulescentes, radicantes. Folia verticillata vel 
opposita, sessilia. Spathse axillares. 
Anacharis, Rich, in Mem. de V Institute 1811, ii. p. 61. t. 2 (mas). 
Udora, Gen. N. Amer. Plants, ii. 242. 
A. Alsinastrum (nov. sp. .?*) ; folds ternis ovali-oblongis obtusis sub- 
tilissime serrulatis, spatha floris masculi (ignota), floris feminei 
tubulosa ovarium sessilem pluries superante apice bifida, perigonii 
laciniis latis subaequalibus, stigmatibus ligulatis reflexis emargi- 
natis. 
Hab. In ponds connected with the canal at Foxton Locks 
near Market Ilarborough, Leicestershire, where it was disco- 
vered by Miss Mary Kirby, flowering sparingly, at the begin- 
ning of September 1847. 
Plant submersed; stem solid, round, semitransparent, several 
feet long, branching at irregular and distant points, clothed 
throughout with whorls of leaves. Leaves three (rarely four) in 
each whorl, oblong, 3-4 lines long, 1^-2 lines broad, obtusely- 
pointed, minutely and closely serrulate, diaphanous, formed 
throughout (a continuous semitransparent midrib excepted) of 
longitudinal rows of small oblong green cells, of which the two 
or three marginal rows are eolourless and quite transparent ; edge 
furnished with very minute elosely-plaeed (except towards the 
base, where they are altogether v/anting or very distant) spinulose 
teeth pointing forwards ; end formed of two eurves meeting at an 
obtuse angle and tipped with a spinous point similar to the mar- 
ginal ones ; uppermost leaves blunter than the lower ones, and 
often quite obtuse ; all spreading at right angles from the stem, 
their extremity rather reflexed ; lower internodes about as long 
as the leaves, lowest much longer and with opposite and short 
* A. calUtrichoides, Rich., is expressly stated by that author to be an- 
nual, our plant is undoubtedly perennial. In a growing plant, now (Dec. 22, 
1847) before me, the old stem is losing its leaves, which have nearly all 
decayed and fallen off, and appears to be itself on the point of death, but 
several clusters of young shoots have sprung from it, at the base of which 
roots are produced. In the spring each of these clusters will probably ap- 
pear to be an independent young plant. This may account for the supposed 
annual duration of some of the species. 
6 * 
