2858.
POTAMOGETON pradongus.
Long-stalked Pondweed.
TETRANDRIA Tetragynia.
Gen. Char. Flowers sessile upon a spike which issues
from a sheathing bractea. Perianth single,
of 4 scales. Anthers sessile, opposite to the
scales of the perianth. Pistils 4, which become
4 small nuts. Embryo curved.
S pec. Char. Leaves all submersed, elongate-oblong,
amplexicaul, obtuse and hooded at the
end, entire. Stipules without wings. Nut obliquely
ovate, keeled on the back when dry.
Spike cylindrical, rnany-flowrered. Peduncle
very long, cylindrical.
S yn. Potamogeton praelongus. ££ IVulf. in lioem.
Arch. 3. 331.” Linncea, v. 2. 191. t. 3. f. 14.
Reich. Iconog. t. 185. ƒ/323. Dethard. i'onsp.
Megapol, 15. t. 1. Gaudin FI. Helv. v. I.
474. Host FI. Aust. v. 1. 222. Hook. Br. FI.
70. Koch Syn. 676. Murray’s Northern
Flora 106. Kunth FI. Berol. v. 2. 312.
r p
HIS fine Potamogeton has now been noticed in many
parts of the kingdom : in Scotland it would not appear to
be of rare occurrence ; in England it has been found in only
two stations, namely, in a ditch adjoining the river Thames
at Caversham bridge, near Reading, by W. Borrer, Esq.,
and in the river Waveney in many places between Scole
and Beccles, in the greatest plenty ; Dr. Taylor has found
it in the river Blackwater, in the county of Kerry, Ireland.
The specimens figured were gathered in the river Wave