384 poltgonacejE. ,(BUCKwnEA.T jtamily.) 



jessile. Stigma capitate or many-cleft. Utricle indehiscent, 1-seeded, included 

 in the calyx. Seed vertical. Kadicle ascending. — Woolly or hairy annuals. 

 Leaves opposite. Spikes opposite, and terminating the naked peduncle-lilco 

 summit of the stem. 



1 . P. Floridana, Moquin. White-tomentose or woolly : stem erect, sim- 

 ple or branched ; leaves varying from linear to oblong ; spikes ovate or oblong, 

 lengthening with age ; bracts rtiostly blackish, shprter than the woolly calyx ; 

 style short ; stigma capitate ; fruiting calyx round-ovate, compressed, toothed 

 along the margins, and minutely tubercled at the base. (Opiotheca Floridana, 

 Nutt.) — Dry sandy places, Georgia, Florida, and westward. July- Sept. — 

 Stem ^°-3° high. Spikes solitary, few, or numerous. 



Order 110. POLYGON ACE^. (Bcckwheat Family.) 



Herbs, shrubs, or (tropical) trees, with simple mostly alternate and 

 stipulate leaves, and perfect or dioecious flowers. — Calyx 3 - 6-cleft, or 

 3 - 6-sepalous, persisten,t. Stamens 4-12, inserted on the base of the 

 calyx: anthers 2-celled. Ovary single, 1 -celled, with the solitary ortho- 

 tropous ovule erect from the base of the cell. Styles 2-3, distinct or 

 partly united. Fruit (achenium) lenticular or 3-angled, rarely ovoid. 

 Embryo mostly on the outside of mealy albumen. Kadicle pointing 

 upward. — Stipules sheathing, annular, or wanting. 



Synopsis. 



Suborder I. P0LYG0NE.2;. Involucre none. Calyx 5-cleft or 

 STSepaloys. Stamens 4-9 (mostly 5 - 8). Ovules sessile. Embryo 

 curved on the outside of the albumen, rarely straight in its centre. 

 Stipules sheathing. ' 



* Calyx 5-sepalous, the inner sepals erect, mostly enlarged in fmit. 

 1. KUMEX. Calyx green, often grain-bearing. Stigmas many-cleft. 

 J. POLYGONELLA. Calyx corolla-like. Stigma entire. 



* * Calyx 5-.<!epaIous, the pepals all erect, unchanged in fruit, free from the achenium. 

 S. POLYGONUM. Sepals entire. Embryo curved on the outside of the albumen. 



4. THTSANELLA. Inner sepals fimbriate. Embryo straight at the side of the albnmen. 



• ♦ * Calyx 5-parted, the lube enlarged and fleshy in fruit, and partly united with the 



achenium. 



5. COCCOLOBA. Achenium ovoid or globose. Trees. 



Suborder II BRUNNICHIE.S;. Involucre none. Calyx 5-parted, 

 the tube enlarged and indurated in fruit. Stamens 8. Ovule borne on 

 p. slender stalk. Embryo at the margin of the albumen. Stipules none. 



6 BRUNNICHIA. Pedicels winged in fruit. Climbing shrubs. 



