OXYRIA. — POLYGONUM. '283 



leafless. Nut elliptical.— Ditches and river-sides. P. VII. VIII. 

 Great Water Dock. 



*11. R.alpinus (L.); enlarged pet. cordate-ovate membranous 

 entire or denticulate without tubercles, I. roundish-cordate blunt 

 with channeled petioles, upper I. ovate. — E.B. S. 2694. — Whorls 

 crowded, mostly leafless. Nut elliptical, acute. — Formerly cul- 

 tivated. P. VII. Monk's Rhubarb. E. S. 



** Fl. dioecious. Herbage acid. Acetosella Tourn. Sorrels. 



12. R. acetosa (L.) ; enlarged pet. roundish-cordate entire 

 membranous with a very minute tubercle at the base, sep. reflexed, 

 1. oblong sagittate, stipules laciniate-dentate. — R. Pseudo-acetosa 

 Bert.,^.B. 127?— Height 1—2 feet. Whorls leafless. Nut el- 

 liptical with acute angles. — Smith describes under this name the 

 R. hispanicus (" Muntmg," 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-hastate 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. 0. reniformis (Hook.).— i;. B. 910.— St. 8—10 in. high, 

 usually leafless. L. radical, reniform, slightly notched at the end, 

 with the veins radiating from the insertion of the long footstalk. 

 Pedicels thickening upwards, jointed in the middle. The per- 

 manent pet. not enlarged. — Lofty mountains. P. VII. VIIl. 



3. Polygonum Linn. 



* Stem simple, bearing one spike. Ochres truncate. Root a 

 rhizome. Nut triquetrous. Stam. 8. Styles 3. Bistorta. 



1. P. Bistorta {\j.) ; spike dense, I. ovate subcordate, root-l. 

 with winged footstalks, faces of nut ovate smooth. — E. B. 609. 

 — St. 1 — H 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, I. linear-lanceolate with revolute margins, lower I. 

 elliptical with wingless footstalks, faces of nut ovate-lanceolate 

 smooth and shining. — E. B. 669. — • Height 4 — 8 in. Spike 

 slender, the fl. on the lower part replaced by small red bulbs. 



