65 
Origttal Articles. 
ON POTAMOGETON LANCEOLATUS OF SMITH. 
By Arrsur Bennett. 
(Tas. 217). 
Con nterest has always attached to this plant from the 
fact that. it is sit certainly known to occur elsewhere ar in 
Britain. Itisa species which has] been much misunderstood by 
continental botanists,—partly, I am inclined to believe, on erie 
of the scarcely satisfactory figure of the Welsh plant in 
Botany.’ The specimens which I obtained in the Fens last year 
ee Journ. Bot. 1880, p. 276), have enabled me to add a few details 
to Smith’s original description ; and I have thought that a figure 
prepared from the Rae to material sctlectea d might serve to 
render the plant better understood, and at the same time afford an 
Ponaoorron LANCEOLATUS, Smith. * ee ae Botany,’ vol. 
XXVill., t. 1985; ‘English Flora,’ ed. 2, vol. i., p. 288. Hooker 
and Paes British Flora,’ ed. 6, p. 469, 470. tA Hand- 
book,’ ed. 1, p. 498 (lucens, var.) Syme English Botany,’ vol. ix., 
Pp. 34, t. 1408. Babington ‘ sons ed. 7, p. 872. J. D. Hooker 
‘Student’s Flora,’ ed. 2 
Non P, lanceolatus, Deal ‘Wolfgang ! Reich. ! 
Nec P. nigrescens, Fries 
ag slightly creeping. Stem slender (usually naked ie 
the Fen plant), much branched. Submerged leaves mostl 
translucent, entire gin, with 8 to 6 ribs, connected by 
transverse, sometimes branched veins, and with chain-like network 
aes 18 elongated along the midrib. Upper one apvaned lanceo- 
€ Fen plant), subcoriaceous or Oak 5 with 79 ribs, 3 
er mee veins, which are often branched; the whole leaf 
chain-like network (aenclehens more conspicuous towards the 
midrib, Stipules free, small subulate to linear, upper larger, 
lanceolate, not winged on the back, ‘but with two strong ribs. 
[* It seems right t v point out that although this form of the ovat is that 
usually eo pe it was originally published by Smith as lanceo Ep. 
tT.) 
Journ. 
N.8. vou. 10. [Manrcu, 1881.] : 
