282 66. POLYGONACE.E. 



oblong obtuse, upper 1. lanceolate acute, st. procumbent. E. B 

 15/6. St. straggling. Whorls distant. Nuts ovate, acute. 

 Dry waste places. P. VII. IX. Fiddle Dock. 



6. R. obtusifolius (L. ?) ; enlarged pet. ovate-blunt-triangular 

 subulate- dentate below with raised veins and an oblong or ligu- 

 late entire point one principally tubercled, lower I. cordate-ovate- 

 oblong blunt, upper 1. oblong or lanceolate, branches ascending. 

 -E. B. 1999. Height 23 feet. Whorls distant, leafless. 

 Nut elliptical, acute, nearly twice as long as broad. All the 

 British specimens that I have seen are R. Friesii (Gren.), R. di- 

 varicatus (Fr.). They are probably not the true R. obtusifolius 

 (L.) which is said to be the R. sylvestris (Wahlr.) and has only 

 slightly toothed small triangular and less strongly veined en- 

 larged pet., and a nut scarcely longer than broad ; and appears 

 to grow only in the north of Europe. It may be expected to 

 occur in Scotland. Pastures and waste ground. P. VII. IX. 



7. R. pratensis (M. and K.) ; enlarged pet. unequal cordate 

 dilated and toothed at the base with a small entire triangular point 

 one principally tubercled, 1. oblong-lanceolate acute, lower 1. 

 slightly cordate below. E. B. S. 2/57.. Whorls approximate 

 but not crowded, mostly leafless. Unopened anth. white. Nut 

 elliptical. One enlarged pet. larger than the others, sometimes 

 all 3 equally tubercled. Marshy places, rare. P. VI. IX. E. 



8. R. crispus (L.) ; enlarged pet. cordate entire or crenulate 

 one principally tubercled, 1. lanceolate acute wavy crisped. E. B. 

 1998. Height 2 3 feet. L. narrowed or truncate below. Nut 

 elliptical. Enlarged pet. equal, sometimes all equally tubercled. 

 Road-sides, fields, &c. P. VI. VIII. Curled Dock. 



9. R. aquaticus (L.) ; enlarged pet. broadly cordate membra- 

 nous entire or wavy without tubercles, 1. lanceolate, lower 1. some- 

 what cordate, petioles flat and margined above. E. B. S. 2698. 

 R. domesticus Hartm., Fries, Koch. Height 3 4 feet. L. very 

 large. Whorls crowded, mostly leafless, forming a large dense 

 lobed panicle. Nut elliptical, acute. In the north of E. and in 

 S., preferring spots liable to be flooded, P. VII. VIII. E. S. 



[Dr. Arnott finds what " seems to be R. conspersus (Hartm.)" 

 in Kinross-shire. It has membranous netted broadly cordate 

 toothed enlarged petals. I have only seen a few fruits and do 

 not consider it to be the R. conspersus.] 



10. R.Hydrolapathum(H.u&$ l .)', enlarged pet. ovate-triangular 

 nearly entire all tubercled, I. lanceolate acute tapering below, pe- 

 tioles flat but not margined above. E. B. 2104. St. 35 feet 

 high. L. often more than a foot long. Whorls crowded, mostly 



