392 POLYGONACE^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. Kacemes 6' long. 



2. C. Floridana, 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 exserted; achenium ovoid, obtuse. South Florida. A small 

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

 nium 4" -5" long. 



6. BRTTNNICHIA, 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 angles 

 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 slender 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' long. 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 

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

 nium 3-angled or 3-winged. Embryo straight in the 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, tomentose, corymbose above, leafy 

 below ; leaves smooth or villous above, white-tomentose beneath, the lowest clus- 

 tered, oblong-linear, long-tapering at {he 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. \ Stem 2 - 3 

 high. Lowest leaves 3' - 5' long. 



2. E. tomentOSUm, Michx. Stem erect, tomentose, corymbose above, 

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

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

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

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

 2 - 3 high. Lowest leaves 4' - 6' long. Flowers very numerous on one side 

 of the spreading branches. 



