274 66. POLYGONACES. 
1. oblong sagittate, stipules laciniate-dentate.—R. Pseudo-acetosa 
Bert., E. B. 127.2—Height 1—2 feet. Whorls leafless. Nut el- 
liptical with acute angles—Smith describes under this name the 
R. hispanicus (“Munting,” Koch) which is occasionally cultivated. 
—Meadows and pastures. P. V. VI. 
13. R. Acetosella (L.); petals scarcely enlarged ovate not 
tubercled, sep. ascending, 1. lanceolate-bastate or linear with en- 
tire lobes, stipules torn.— E. B. 1674.—Height 6—10 in. Whorls 
leafless. L. very variable in breadth.—Dry gravelly places. P. 
V.—VII.  Sheep’s Sorrel. 
[R. scutatus (L.); 1. hastate-ovate slightly fiddleshaped, has 
been found “ naturalized” near Edinburgh, and elsewhere. ] 
2. Oxyria Hill. Mountain Sorrel. 
1. O. reniformis (Hook.).—E. B. 910.—St. 8—10 in. high, 
usually leafless. L. radical, reniform, slightly notched at the end, 
with the nerves radiating from the insertion of the long footstalk. 
Pedicels thickening upwards, jomted in the middle. The per- 
manent pet. not enlarged.—Lofty mountains. P. VIT. VIII. 
3. Potyconum Linn. 
* Stem simple, bearing one spike. Ochree cylindrical, truncate. 
Root a rhizome. Nut triquetrous. Stam. 8. Styles 3. 
Bistorta. 
1. P. Bistorta (L.); spike dense, 1. ovate subcordate, root-l. 
with winged footstalks, stam. half as long again as the perianth, 
nut triquetrous its faces ovate smooth.— HB. B. 509.—St. 1—1} 
foot high. Root large. Fl. flesh-coloured.—Moist meadows. 
P. VI. and X. Snakeweed. 
2. P. viviparum (L.); spike lax bulbiferous bearing fl. on its 
upper part, 1. linear-lanceolate with 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. FI. white, sometimes 
very few in number.—Mountain pastures. P. VI. VII. 
** Ochree cylindrical, truncate. Root fibrous. Nut com- 
pressed or triquetrous. Stam. 4—8. Styles 2—3. Fi. 
spiked, rarely capitate.—Fl. purple or white. L. without or 
with a central dark spot. Persicaria. 
3. P. amphibium (L.); spike dense ovate-cylindrical, 1. stalked 
ovate oblong (floating) or oblong-lanceolate or narrow-lanceolate 
rough at the margins, ochree membranous narrow, nut com- 
