POLYGONACE. tk 
ably larger than in P. Persicaria, about 4 inch long, and doubly 
concave; the perianth strongly veined with hooked veins, and is usually 
of a dull greenish white, more rarely slightly tinged with rose colour. 
The styles are distinct for a greater part of their length, and are longer 
than those of P. Persicaria. The leaves are generally marked with a 
black blotch, and are very often clothed with short cottony hairs 
beneath, and scattered ones above; the nerves on the under side 
strigosely hairy. Mr. Watson found a curious form in Guernsey with 
the leaves nearly as broad as long. 
Var. 6 has very much the aspect of the var. elatum of P. Persicaria, 
but is always readily distinguishable by the conspicuous glands on the 
peduncles, pedicels, perianth, and leaves, except when the latter are 
clothed with white woolly hair beneath, in which case the glands are 
not visible. The perianth also is more strongly veined, and the nut is 
broader, shorter, and concave on each face. None of the flowers, so 
far as I have seen, have 3 styles, and consequently there are no 3-sided 
nuts. I do not see how it can be separated from var. «, even as a sub- 
species. 
Glandular Persicaria. 
French, Renouée a fewilles de patience. German, Ampferblittriger Knéterich. 
SPECIES X1—POLYGONUM AMPHIBIUM. Lim. 
Pratrrs MCCXLI. MCCXLIL. 
Billot, Fl. Gall. et Germ. Exsice. No. 1061, 
Perennial. Rootstock rather slender, woody, branched, and exten- 
sively creeping. Stem erect (or swimming), simple, or sparingly 
branched. Leaves, when the plant is terrestrial, shortly stalked, 
oblong-strapshaped or lanceolate-strapshaped, rounded or subcordate 
at the base, attenuated towards the apex, acute: but when the plant 
is aquatic, the leaves have conspicuous stalks, are broader, generally 
more cordate at the base, much less attenuated towards the apex, and 
float on the surface of the water. Ochrex rather tight, not fringed, 
or sometimes apparently so, in the terrestrial form, from the hairs which 
clothe them projecting beyond the margins. Racemes spikelike, cylin- 
drical or oblong, erect, solitary or in pairs at the extremity of the stem, 
sometimes with 1 or 2 racemosely arranged beneath the terminal one, 
dense, continuous, not interrupted or leafy at the base. Peduncles 
usually hairy, without glands; pedicels shorter than the nut, articulated 
immediately below the perianth, without glands. Perianth coloured, 
without glands or prominent veins. Stamens5. Styles 2, united half- 
way up. Nut (rarely matured), much shorter than the perianth, 
roundish-ovoid, abruptly pointed, doubly convex, finely shagreened, 
shining. Leaves rough with very short stiff hairs in the terrestrial 
