280 66. POLYGONACE*. 



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

 hard and thick. 



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

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

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

 rkomboidal-3-loied with the lateral lobes truncate the back 3- 

 ribbed the 2 lateral ribs often terminating in tubercles, seeds 

 rough opaque. — A. laciniata Sm. (L. mpart)E. B. 166.^Plant 

 hoary throughout. Fr.-perigones large, very broad. — Sea-shore. 

 A. VII.— IX. 



7. Obione Gaert. Sea Purslane. 



1. 0. pedunculata {M.0(\.) ; st. herbaceous wavy branched, 1. 

 obovate entire attenuated below, upper 1. narrower, /r.-/)eri^o?ie 

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

 mediate tooth.— £. B. 232. St. 80. 5. Alriplex Sm.— Muddy 

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

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



2. O. portulacoides (Moq.) ; St. woody, 1. obovate-lanceolate 

 entire attenuated below,/r.-pm^one inversely triangular rounded 

 below subsessile with 3 equal lobes above and muricated on the 

 back. — E.B.2(i\. Si. 80. 4. Atriplex Sm. — Common on the 

 sea-shore. P. YIII.— X. 



Order LXVI. POLYGONACE^. 



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

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

 stigmas 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 irmer segments]aYge, 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. 



