280 66. POLYGONACE^E. 



** Stem buff-coloured, nearly without stripes. Perigone of fr. 

 hard and thick. 



9. A. arenaria (Woods) ; st. spreading procumbent with spread- 

 ing branches, I. triangular -rhomboidal sinuate mealy beneath, 

 spike of male fl. dense naked, fertile fl. axillary, fr.-perigones 

 rhomboidal-3-lobed with the lateral lobes truncate the back 3- 

 ribbed the 2 lateral ribs often terminating in tubercles, seeds 

 rough opaque. A. laciniata Sm. (L. inpart)E.B. 165. Plant 

 hoarv throughout. Fr.-perigones large, very broad. Sea-shore. 

 A. VII. IX. 



7. OBIONE Gaert. Sea Purslane. 



1. 0. pedunculata (Moq.) ; st. herbaceous wavy branched,!, 

 obovate entire attenuated below, upper 1. narrower, fr.-periaone 

 long-stalked inversely wedgeshaped 2-lobed with a small inter- 

 mediate tooth. E. B. 232. St. 80. 5. Atriplex Sm. Muddy 

 salt marshes near the east and south coasts of England, and Cun- 

 namara, Ireland; very rare. A. VIII. IX. E. I. 



2. 0. portulacoides (Moq.) ; st. woody, 1. obovate-lanceolate 

 entire attenuated be\o\v,fr.-perigone inversely triangular rounded 

 below subsessile with 3 equal lobes above and muricated on the 

 back. E. B. 261. St. 80.4. Atriplex Sm. Common on the 

 sea-shore. P. VIII. X. 



Order LXVI. POLYGONACE^l. 



Perianth 3 6-parted, imbricate. Stam. definite, from the base 

 of the perianth. Ovary 1, free, with 1 erect ovule. Styles and 

 gtigmas several. Fr. not bursting, a nut, naked or covered by 

 the enlarged perianth. Embryo inverted, usually on one side of 

 farinaceous albumen ; radicle remote from the hilum. Stipules 

 usually cohering in the shape of ochreae. For figures of the 

 genera see G. F. G. Monochl. 



1. RUMEX. Perianth 6-parted; 3 inner segments large, con- 

 nivent. Stam. 6, disposed in pairs. Styles 3. Stigmas 

 multifid. Nut triquetrous, covered by the enlarged inner 

 segments of perianth ; embryo lateral. 



2. OXYRIA. Perianth 4-parted; 2 inner segments larger. 

 Stam. 6. Stigmas 2, multifid. Nut compressed, with a 

 membranous wing, larger than the persistent segments of 

 perianth ; embryo central. 



3. POLYGONUM. Perianth 5-parted. Stam. 5 8. Styles 

 2 3. Nut trigonous or compressed; embryo lateral, in- 

 curved ; cotyledons not contorted. 



