392 rOLYGOXACE.E. (buckwheat family.) 



single; stamens included; achenium ovate, acute. — South Florida, along the 

 coast. — A shrub or small tree, with rigid spreading branches. Leaves 3' - 5' 

 wide, very thick. Racemes 6' long. 



2. C. Ploridana, Meisner. Smooth ; leaves petioled, somewhat coria- 

 ceous, elliptical, obtuse at each end; racemes slender, terminal and on short 

 lateral branches, recurved; pedicels 2-3 together, about the length of the 

 calyx ; stamens exsertcd; achenium ovoid, obtuse. — South Florida. — A small 

 tree. Leaves 2' -3' long. Sheaths loose, brown. Racemes 2' - 8' long. Ache- 

 nium 4" -5" long. 



6. BRUNNICHIA, Banks. 



Flowers perfect. Calyx bell-shaped, 5-parted, the tube enlarged in fruit and 

 enclosing the free achenium. Stamens 8 or 10. Styles 3, slender ; stigmas 

 entire. Ovule borne on a slender cord from the base of the ovary, pendulous. 

 Achenium obtusely 3-angled. Seed 6-furrowed. Embryo in one of the ai 

 of the mealy albumen. — A smooth vine, climbing by terminal tendrils. Leaves 

 ovate or cordate-ovate, petioled, acute, deciduous. Sheaths obsolete. Flowers 

 greenish, in axillary and terminal racemes, on sleudcr pedicels, which become 

 indurated and flattened in fruit. 



1. B. cirrhosa, Banks. — River-banks, Florida to South Carolina. April 



and May. — Stem shrubby, 10°-20° long. Leaves 2' -3' lone;. Racemes 3'- 

 6' long. Bracts ovate, acuminate, 3-5-flowered. Fruiting pedicels curved. 



7. ERIOGONUM, Michx. 



Flowers perfect or polygamous, surrounded by an involucre. Calyx deeply 

 6-cleft. Stamens 9. Ovary free, 3-sided. Styles 3 : stigmas capitate. Ache- 

 nium 3-angled or 3-winged. Embryo straight in tho axis of the albumen, or 

 more or less curved. — Downy or woolly herbs. Leaves alternate, opposite or 

 whorled. Sheaths none. Inflorescence various. 



1. E. longifolium, Nutt. Stem erect, tomentosc, corymbose above, leafy 

 below ; leaves smooth or villous above, whitc-tomentosc beneath, the lowesl clus- 

 tered, oblong-linear, long-tapering at the base, the upper scattered, the uppermost 



bract-like; involucre stalked, many-flowered, obtusely 5-toothed ; calyx herba- 

 ceous, equal, woolly without. — Sand ridges, East Florida, y. — Stem 2°-3° 

 high. LoweBt leaves 3'-5' long. 



2. E. tomentosum, Michx. Stem erect, tomentosc, corymbose above, 

 leafy throughoul ; leaves smooth above, white tomentose beneath, the lowest 

 clustered, obovate-oblong, long-petioled, the others in whorls of 3-4, elliptical, 

 Bessile | involucre sessile, obtusely 5-toothed ; calyx white, unequal, woolly with- 

 out —Dry pine barrens, Florida to South Carolina. July- Sept. y.— Stem 

 2°-8°high. Lowest leaves I'- 6' long. Flowers very numerous on one side 

 of the spreading branches. 



