OXYRIA. I’OLYCONUM. 
273 
Koch) which is occasionally cultivated, it has ovate enlarged ))Ct. 
each with an ohlong green gland extending through more than 
half its length. — Meadows and pastures. P. V. VI. 
13. R. Acetosella (L.); petals scarcely enlarged ovate not 
tubercled, sep. ascending, 1. lanceolate-hastate or linear with en- 
tire lobes, stipules torn. — E. B. I(i7-1. — Height tJ — 10 in. Whorls 
leafless. L. very variable in breadth. — Dry gravelly j)laees. P. 
V. — VII. Sheep’s Sorrel. 
[R. (L.) which has hastate-ovate slightly fiddleshaped 
1. has been found “ naturalized ” at Craigmillar Castle near Edin- 
burgh by Mr. E. Young, and elsewhere.] 
2. OxYRIA Hill. 
1. 0. reniformis (Hook.). — E.B. 910. — St. 8 — 10 in. high, 
usually leafless. L. radical, reniform, slightly notched at the enil 
with the nerves radiating from the insertion of the long footstalk. 
Pedicels thickening upwards, jointed in the middle. The per- 
manent pet. not at all enlarged. — Lofty mountains. P. VII. 
VIII. Mountain Sorrel. 
3. Polygonum Linn. 
* Stem simple, bearing one spike. Ochrece cylindrical, truncate. 
Root a rhizoma. Cotyledons accumbent. Nut triquetrous. 
Siam. 8. Styles 3. Bistorta. 
1. P. Bistorta (L.)j spike dense, 1. ovate suheordate, radical 
1. with winged footstalks, stam. half as long again as the perianth, 
nut triquetrous its faces ovate smooth. — E. B. 509. — St. 1 — 1^ 
foot high. Root large. FI. flesh-colom'ed. — Moist meadows. 
P. VI. Snakeweed. 
2. P. viviparum (L.); spike lax bulbiferous bearing fl. on its 
upper part, 1. linear-lanceolate vith revolute margins, lower 1. 
elliptical with wingless footstalks, stam. twice as long as the peri- 
anth, nut triquetrous its faces ovate-lanceolate smooth and shi- 
ning. — E. B. 669. — Height 4 — 8 in. Spike slender, the fl. on the 
lower part replaced by small red bulbs. Fl. flesh-coloured, some- 
times very few in number. — Mountain pastm-es. P. VI. VII. 
** Ochreee cylindrical, truncate. Root fibrous. Cotyledons 
accumbent. Nut compressed or triquetrous. Stam. A — 8. 
Styles 2 — 3. Fl. spiked, rarely capitate. — Fl. purple or 
white. L. without or with a central dark spot. Persicaria. 
3. P. amphibium (L.) ; spike dense ovate-eylindi'ical, 1. stalked 
ovate oblong (floating) or oblong-lanceolate or narrow-lanceolate 
rough at the margins, ochreae membranous narrow, nut com- 
pressed smooth shining, stam. 5, root creeping. — E. B. 436. — 
N 5 
