308 66. POiTGOlfACE^. 



end ; veins radiating from the insertion of the long footstalk. 

 Pedicels thickening upwards, in a spikelike raceme. Permanent 

 pet. not enlarged. — Lofty mountains. P. VII. VIII. E. S. I. 



3. PoLT&'oNirM: Linn. 



* Rhizomatous. Stem simple. Ocrecs truncate. Nut tri- 

 quetrous. Stam. 8. Styles 3. Bistorta. 



1. P. JSistor'ta (L.) ; raceme cylindric dense, I. ovate suhcordate, 

 root-1. with winged footstalks, faces of nut ovate smooth. — 

 E. B. 509.— St. 1—1 A foot high. Rhizome large. Fl. flesh- 

 coloured. — Moist meadows, rare. P. VI. and X. Snakeweed. 



E. S. I. 



2. P. ■eivip'arum (L.) ; raceme slender lax bulbiferous bearing 

 fl. on its upper part, l.-linear-lanceolate with revolute margins, 

 lower I. elliptic with wingless footstalks, face of nut ovate-lan- 

 ceolate smooth and shining. — E. B. 669. — Height 4 — 8 in. Fl. 

 on the lower part of the raceme replaced by small red bulbs. 

 Fl. white, sometimes verv few in number.- — Mountain pastures. 

 P. VI. VII. ■ E. S. I. 



** Ocrece trtmcaie. Boot fibrous. Nut compressed or subtri- 

 quetrous. Stam. 4 — 8. Styles 2 — 3. Racemes spikelike.— 

 Fl. pmyle or white, L. without or with a central dark spot. 

 Persicaria. 



t Creeping. Perennial. Anthers protruded. 



3. P. amphib'ium (L.) ; raceme dense ovate-cylindrical, 1. 

 stalked ovate-oblong (floating) or oblong-lanceolate or narrow- 

 lanceolate rough at the margins, ocrese membranous close, nut 

 compressed smooth shining, stam. 5. — B. B. 436. — St. long when 

 floating. Baremes yenerally solitary and terminal. Fl. rose- 

 coloured. Stam. protruded or not. Very variable in the form 

 of its leaves according to its habitation. — Floating or growing 

 upon mud or on boggy ground. P. VII. — IX. B. S. I. 



tt Root fibrous. Annual. Anthers included. 



4. P. lapathifdlium (L.) ; raceme oblong cylindrical dense, 1. 

 oblong-lanceolate or ovate attenuate at both ends glandular 

 beneath, ocrecs close not fringed the upper ones shortly fringed, 

 peduncles and perianth rough with glands, nut compressed its faces 

 roundish acuminate concave smooth shining scarcely covered 

 by the prominently veined perianth, stvles distinct at length 

 divergent and reflexed.— ^. B. 13,S2.— keight 1—2 feet. St. 

 sometimes spotted, glandular or glabrous; joinings more or less 



