rOLYGOXACKvE. (BUCKWHEAT FAMILY.) 391 



obtuse ; sheaths naked ; flowers in axilhiry clusters, or forming long interrupted 

 and leafless racemes ; fruiting calyx ovate, minutely pubcrulent, closely invest- 

 ing the dull black achcnium, the outer lobes keeled. — Cultivated ground. In- 

 troduced. July - Sept. — Stems 1° -3° long. 



16. P. cilinode, Michx. Minutely pubescent; stem tAvining; leaves 

 ovate, cordate or somewhat hastate at the base, acuminate, petioled ; sheaths 

 with a row of reflexed hairs at the base; flowers in loose simple axillary and 

 pauicled racemes ; fruiting calyx smooth, nearly including the smooth and sliin- 

 ing achcnium, the outer lobes slightly keeled. — Dry rocks on the mountains of 

 North Carolina, and northward. July - Sept. — Stem 3° - 9° long. 



17. P. dumetorum, L. Smooth; stem twining; leaves ovate, acuminate, 

 long-petioled, cordate or somewhat sagittate at the base ; sheaths naked ; flowers 

 in long axillary more or less leafy racemes ; fruiting calyx somewhat spatulate, 

 emarginate, much longer than the smooth and shining achcnium, the outer lobes 

 winged and decurrent on the pedicel. (P. scandcns, L.) — Low margins of 

 fields and thickets, Florida, and northwiu-d. June -Sept. — Stem C°-12° 

 long. 



4. THYSANELLA, Gray. 



Flowers polygamous. Calyx corolla-like, deeply 5-parted, unchanged in 

 fruit ; lobes erect, unequal ; the 2 outer ones cordate at the base ; the inner ones 

 smaller, pectinatc-fimbriate. Stamens 8, the filaments filiform. Styles 3, fili- 

 form : stigmas entire, obtuse. Achenium ovate, 3-angled, nearly included in the 

 persistent calyx. Cotyledons on the outside of the albumen. — An erect smooth 

 and brandling annual, with long linear actite leaves, truncate cylindrical sheaths, 

 fringed with long bristles, and white or rose-colored flowers in closely bracted 

 spikes. 



I. T. fimbriata, Gray. (Polygonuni fimbriatum, Z7//.) — Dry pine bar- 

 rens, Georgia and Florida. Sept. and Oct. — Stem branching above, 2° high. 

 Leaves I' -2' long. Sheaths smooth, adnate to the leaves, not longer than the 

 fringe, the lower ones imbricated. Spikes 2' -3' long, panieled, erect, the upper 

 ones pistillate, the lower staminate. Bracts pointed with a long and slender 

 awn Outer caly.x-lobes oblong, entire in the staminate flowers, fimbriate, like 

 the inner ones, in the pistillate ones. 



5. COCCOLOBA, Jacq. 



Flowers perfect. Calyx herbaceous, .5-parted, the tube enlarged and more or 

 less fleshy in fruit. Stamens 8. Filaments subulate. Styles 3 : stigmas entire. 

 Achenium nearly globose, included in and partly united with the persistent calyx. 

 Embryo straight in the axis of mealy albumen. — Trees or shrubs, with alter- 

 nate leaves, tnincatc sheaths, and small greenish flowere in axillary and terminal 

 racemes. 



1. C. uvifera, Jacq. (Sea-Grape) Smooth ; leaves short-petioled, cori- 

 aceous, orbicular-cordate or reniform ; racemes terminal, rigid, erect ; pedicels 



