66. POLTGONACEiE. 297 



iny branchea, /. triangidar-rhomhoidal sinuate mealy beneath, 

 spike of male fl. dense naJeed, fertile fl. axillary, fr. -perianths 

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

 ribbed the two lateral riba often terminating in tubercles, seeds 

 rough opaque. — A. arenaria Woods (not Nutt.). A. laciniata 

 Sm. (L. in part). K B. 165. — Plant hoary throughout. Fr.- 

 perianths large, very broad. — Sandy shores. A. VII. — IX. 



E. S. I. 



7. Obi'one Gaert. Sea- Purslane. 



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

 obovate entire attenuate below, upper 1. narrower, //-.-^ertawiA 

 long-stalked wedgeshaped 2-lobed with a small intermediate 

 tooth. — U. B. 232. Atriphx Sm. — ^Muddy salt marshes near 

 the east and south coasts of England ; very rare. A. VIII. 



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

 entire attenuate below, /r.-^mnre^A inversely triangular rounded 

 below subsessile with 3 equal lobes above and muricate on the 

 back. — S, B. 261. Atriplex Sm. — Common on the sea-shore. 



P. vm.— X. E. S. I. 



Order LXVI. POLTGONACE^. 



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

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

 and stigmas several. Er. not bursting, a nut, naked or covered 

 by the enlarged perianth. Embryo inverted, usually on one 

 side of fariuaceous albumen ; radicle remote from the hile. — 

 Stipules usually cohering in the shape of ocrese. 



1. RuMEX. Perianths-parted; 3 inner segments (pet.) large 

 with fr., connivent. Stam. 6, disposed in pairs. Styles 3. 

 Stigmas multifid. Nut triquetrous, covered by the enlarged 

 inner segments of perianth ; embryo lateral. 



2. OxTBiA. Perianth ^-parted ; 2 inner segments (pet.) 

 larger. Stam. 6. Stigmas 2, multifid. Nut compressed, 

 with a membranous wing, larger than the persistent seg- 

 ments of perianth ; embryo central. 



3. PoLYGONUir. Perianth ^-parted. Stam. 6 — 8. Styles 

 2 — 3. Stig. capitate. Nut trigonous or compressed ; em- 

 bryo lateral^ incurved ; cotyledons not contorted, 



[4. Fagopybitm:. Perianth 5-parted. Stam. 8. Styles 3. 

 Stig. capitate. Nut trigonous ; embryo central ; cotyledons 

 large, leqflike, plicate-twisted.'] 



5 



