126 Polygonaceae. 



POLYG'ONUM LAPATHIFO'LIUM (97). Pale-flowered Persicaria. 

 (1214) 7 — 8. Stem I — 4 ft. high much branched, nodes stout and swollen, 



leaves ovate acuminate, flowers greenish-white or pink in somewhat 



cylindric spikes. Waste places. 



POLYG'ONUM PERSICA'RIA (112). Spotted Persicaria. 7—10. 



(1213) Stem I — 2 ft. high branched nodes swollen, leaves lanceolate almost 

 sessile usually spotted, stipules loose fringed, flowers pink in numerous 

 cylindric axillary and terminal spikes. Waste places. 



POLYG'ONUM HYDRO PIPER (104). Biting Persicaria. 8—9. 

 (1210) Stem I — 3 ft. high much branched creeping and rooting at the base, 



leaves lanceolate waved, flowers pink in lax slender curved spikes. 



Very acrid. Watery places. 



Polyg'onum dumeto'rum (11). 7 — 8. Stem climbing, leaves cordato- 



(1206) sagittate, 3 outer sepals with broad membranous wings, fruit smooth 

 highly polished, flowers green in slender racemes. [Tb. CI. 



POLYG'ONUM AVICULA'RE (no). Knotgrass. 7—9. Stem pro- 



(1207) cumbent, leaves oblong, stipules silvery fringed, flowers small numerous 

 in axillary clusters. Waste places. 



POLYG'ONUM CONVOL'VULUS (107). Black Bindweed. 7—9. 

 (1205) Stem climbing, leaves cordato-sagittate, flowers greenish in slendei 

 axillary and terminal racemes, fruit dull granulate. 



\\.—RUMEX. 



Leaves alternate, flowers in panicled or racemed whorls, sepals 6 the 

 inner ones larger, stamens 6, anthers fixedly attached to filaments, styles 3, 

 fruit a triangular nut covered by the enlarged perianth. 



Flowers perfect, leaves not acid, 497 

 Flowers dioecious, leaves acid, 498 



497 Inner sepals deeply toothed, 499 



497 Inner sepals entire, 500 



498 Outer sepals reflexed, plant i — 2 ft. high, . . . R. Acetosa. 

 498 Outer sepals ascending, plant under i ft. high, . R. Acetosella. 



499 Lower leaves cordato-ovate obtuse, . . R. obtusifolius. 



499 Lower leaves fiddle-shaped, . . , . R. pulcher. 



499 Lower leaves lanceolate, . . , . . R. maritimus. 

 500 Inner sepals cordate, 501 



500 Inner sepals ovate, 502 



501 Some of inner sepals tubercled, . . . R. crispus. 



501 Inner sepals not tubercled, . . . . R. aquaticus. 



502 Stem 3 — 5 ft. high, R. Hydrolapathum. 



502 Stem under 3 ft., 503 



