POLYGONACEH, (BUCKWHEAT FAMILY.) 391 
obtuse ; sheaths naked ; flowers in axillary clusters, or forming long interrupted 
and leafless racemes ; fruiting calyx ovate, minutely puberulent, closely invest- 
ing the dull black achenium, the outer lobes keeled. — Cultivated ground. In- 
troduced. July - Sept. — Stems 1°-3° long. 
16. P. cilinode, Michx. Minutely pubescent; stem twining; 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 
panicled racemes ; fruiting calyx smooth, nearly including the smooth and shin- 
- ing achenium, the outer lobes slightly keeled. — Dry rocks on the mountains of 
North Carolina, and northward. July- Sept. — Stem 39 - 99 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 achenium, the outer lobes 
winged and decurrent on the pedicel. (P. scandens, L.)—'Low margins of 
fields and thickets, Florida, and northward. June-Sept.— Stem 6°-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, pectinate-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 branching annual, with long linear acute leaves, truncate cylindrical sheaths, 
fringed with long bristles, and white or rose-colored flowers in closely bracted 
spikes. 
1. T. fimbriata, Gray. (Polygonum fimbriatum, El.) — Dry pine bar- 
rens, Georgia and Florida. Sept. and Oct. — Stem branching above, 2° high. 
Leaves 1/-2/ long. Sheaths smooth, adnate to the leaves, not longer than the 
fringe, the lower ones imbricated. Spikes 2/- 3! long, panicled, erect, the upper 
ones pistillate, the lower staminate. Bracts pointed with a long and slender 
awn. Outer calyx-lobes oblong, entire in the staminate flowers, Arbors like 
the inner ones, in the pistillate ones. a 7 
_ . 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- 
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m von Deb 
de e. uvifera, J Seana fe Smooth; leaves short-petioled, cori- — 
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