858 
NOTES ON PONDWEEDS. 
By Aurrep Fryer. 
(Puates 837 & 838.) 
A New Hysrm Poramoceton. 
oTaMOGETON Brntupsn mihi = cortaAcEUS X PLANTAGINEUS.— 
Rootstock inane creeping, fibrous. Stem terete, slender, ascending, 
slightly branched at the base. Lower leaves narrowly lanceolate, 
sessile, naerowed towards the base. Upper leaves elliptical, sessile 
or oc ribbed, with fainter intermediate ribs; midrib wit 
stipule. F'lower-spike very short, less than + in., cylindrical, 
arren. Colour of the whole plant brownish or olive-green. 
x P. Billupsii is a most variable plan pes so widely in 
different stages and conditions of growth from the normal state 
above described, that I could not venture to capunae it until I had 
carefully watched it under cultivation for two seasons. ome 
specimens are not easily separable from P. plantagineus, others 
Bakes resemble local forms of P. Zizi, and others might pass as 
witans form belonging to my P. crassifolius. These may be 
visser the Shc — of Baad apevies, but another series of 
forms closely res ramineus V. raminifoli ius, P. varians, 
evidence of the correctness of my supposition. After having 
observed the growth of these Benwick Zizii-forms for some years, 
I was able to see at a glance that the form now described would 
afford the solution of the origin of the peculiar plant which BLN 
at Benwick. Although I selected specimens for cultivation with 
great care, at first I was afraid that I had mixed “toma of P. 
plantagineus and P. Zizii with the true hybrid form, P. Billupsii. 
n. 
on the wild plant, and this also was infertile, thus confirming the 
epee oT by the growth and foliage of the hybrid origin 
of the spec 
rate harags or Borany,—Vot. 81. [Dxo, 1893.] 2a 
