CLXXIX. POLYGONE^. 633 



ovary, distinct, or more or less united, very rarely adherent to the angles of the ovary ; 

 stigmas simple, capitate or discoid, sometimes feathery or penicillate; ovule solitary, 

 basilar, orthotropous, erect, rarely pendulous from a basal funicle, with the micro- 

 pyle downwards, but always erect when ripe. ACHENE or CARTOPSIS compressed- 

 lenticular, 3-4-gonous, with projecting or obtuse angles, sometimes winged, entire, 

 toothed, or spiny, rarely naked, usually covered by the accrescent and sometimes 

 fleshy perianth. SEED conformable to the cell, erect, free or adnate to the endocarp ; 

 testa membranous ; hilum basilar, large ; albumen copious, farinaceous, rarely sub- 

 fleshy and scanty. EMBRYO antitropous, curved and appressed to the side of the 

 albumen, or straight and axile in the albumen ; cotyledons linear or oval, incumbent 

 or accumbent, sometimes largely foliaceous, flexuous ; radicle superior. 



TRIBE I. ERIOGONE^J. 



Flowers $ , or rarely polygamous, within a 1- or more -flowered tubular invo- 

 lucre. Calyx 6-partite. Stamens 9. Ovary free ; ovule basilar, erect. Embryo 

 included in a scanty albumen. Ochreas obsolete. 



PRINCIPAL GENERA. 

 Eriogonum. Oxytheca. Nemacaulis. Chorizantha. Pterostegia. 



TRIBE II. POLYGONS^} VER3J. 



Mowers $ or polygamous ; involucre 0. Stamens 1 9, usually 6 or 8, rarely 

 12-17. Ovary free or rarely adherent below ; ovule basilar, erect. Stipules 

 ochreate. 



PRINCIPAL GENERA. 



Calligonum. Emex. Muhlenbeckia. * Rheum. * Rumex. 



* Coccoloba. Fagopyrum. Oxyria. * Atraphaxis. Triplaris. 



Oxygonum. * Polygonum. Ruprechtia. 



TRIBE III. BRUNNIGHIE^J. 



Flowers $; involucre 0. Calyx 5-partite. Stamens 8. Ovary free, 3-gonous; 

 ovule pendulous from a basal funicle, erect when ripe. -Ochreas or obsolete. 

 Stems usually woody, climbing, furnished with tendrils. 



GENERA. 

 Antigonum. Brunnichia. 



TRIBE IV. SYMMERIEM 



Mowers dioecious, polyandrous. Calyx of $ 6-partite. Ovary adherent. 



Ochreas 0. 



PRINCIPAL GENUS. 



Symrneria. 



