406 POLYGOXACE.E. (BUCKWHEAT FAMILY.) 



1. S. linearis, Moquiu. Annual; stem diffusely much branched ; leaves 

 linear, acute; calvx lubes obtuse, keeled; stamens exserted. Low sandy 

 places along the coast. Sept. Stem l-3 high. Leaves l'-2' long. 

 .Flowers minute. 



6. SALSOLA, L. SALTWORT. 



Flowers perfect, 2-bracted. Calyx 5-parted, the lobes at length transversely 

 winged. Stamens 5, slightly united at the base. Style slender: stigmas 2. 

 Utricle flattened at the apex, enclosed in the persistent calyx. Embryo coni- 

 cal-spiral. Albumen none. Saline plants, with alternate and fleshy leaves, 

 and axillary flowers. 



1. S. Kali, L. Smooth; stem spreading, ascending; leaves subulate, 

 spine-pointed like the ovate bracts; flowers solitary; calyx lobes coimiveut, 

 with the dilated, membrauaceous wing rose-colored Sandy coast, Georgia, 

 and northward. August. (T) Stem 1- H high. 



ORDER 110. POLYGOXACE^E. (BUCKWHEAT FAMILY.) 



Herbs, shrubs, or (tropical) trees, v\ itli simple mostly alternate and 

 stipulate leaves, and perfect or dioecious flowers. Calyx o - G-cleft, or 

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

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

 thotropous 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. Radicle pointing 

 upward. Stipules sheathing, annular, or wanting. 



Synopsis. 



SCBORDER I. POLYGONE^E. Involucre none. Calyx 5 -6-cleft, or 5- 

 6-sepalous. 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 - 6-sepalous, the inner sepals erect, mostly enlarged in fruit. 



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



2. POLYGOXELLA. Calyx corolla-like. Stigma entire. 



* * Calyx 5-sepalous, the sepals all erect, unchanged in fruit, free from the achenium. 



3. POLYGOXUH. Sepals entire. Embryo curved on the outside of the albumen. 



4. THYSAXELLA. Inner sepals fimbriate. Embryo straight at the side of the albumen. 



* * * Calyx 5-parted, the tube enlarged and fleshy in fruit, and partly united with the 



achenium. 



5. COCCOLOBA. Achenium ovoid or globose. Trees. 



SUBORDER II. BRUXXICHIEvE. Involucre none. Calyx 5-parted, the 

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

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



6. BRTJXXICHIA. Pedicels winged in fruit. Climbing shrubs. 



