POLYGONACEAE 445 
Stigmas capitate. styles short, erect, or none: stems 
slender, twining 14. BILDERDYKIA. 
Stigmas dilated, toothied: styles divaricate: stems 
stout, erect. 15. PLEUROPTERUS. 
IV. ANTIGONONES 
Vine with broad leaves, and racemes of pink or red flowers, ter- 
mina rong in tendrils. 16. CORCULUM, 
V. Eocene Eee 
Vine with tendrils: hypanthium developing into a samara-like 
hey with a wing extending the length of the elongate pedicel- 
like base: stigmas 2-cleft. 17. BRUNNICHIA. 
Shrubs or trees: hypanthium developing into a drupe-like fruit: 
stigmas not 2-cleft. 18. CoccoLonBis. 
. ERIOGONUM Michx. Herbs, partially woody plants, or shrubs. Leaves 
ain D alternate, without Mid the stipules scale-like. Flowering-stems or 
este with alternate or whorled bracts. Flowers involucrate. Hypanthium 
jointed to a pedicel which is subtended by a minute bractlet. Sepals 6, often 
unequal. Stamens 9. Gynoecium 3-carpellary: stigmas capitate-——About 250 
species, North American, mostly in the western United States—WILD-BUCK- 
HEATS. UMBRELLA-PLANTS: 
Flowering stem with whorled leaves, the blades relatively wide: inflorescence with 
leaf-like nee sepals broad, flat or crisped: filaments pubes 
ent bel 1. E. tomentosum. 
Flowering pm with re id t edes the blades relatively nar- 
inflorescence with m e bracts: sepals narrow, invo- 
Mite: filaments glabrous 2. E. floridanum. 
1. E. tomentosum Michx. Basal leaves evergreen, 5—18 cm. long; blades oblong 
to spatulate: flowering-stem 4-12 dm. tall, the leaves in whorls of 3-5; blades 
ovate A e or oblanceolate: involueres 
about 4 . long: sepals baka the inner 
ones Boone ovate is suborbicular, 6-8 mm. 
JE. W UCKWHEAT. )— 
Dry cR and p Coastal Plain, 
and C.—Su 
Fla. to —Sum.—fall or all 
yea r S. 
2. E. flo ridanum Small. Basal leaves some- 
what persistent, 8-20 cm. long; ipe 
long; blades broadly or narrowly lin 
flowering stem 6—10 dm. tall, the leaves e 
bl 
nate; blades linear to ped -lanceolate: in 
volucres 6-7 ,mm. long: "aps sepals Bid: 
der-subulate, becoming 5- ÉD long-silky: ne about 6 mm. lo ong, 
pubescent, the beak ee ong as the body. [E. p EUNT (Chapm. 
Fl. )]—Dry sandy Pd nds a scrub, C Fla.—Spr.-fal 
2. ACETOSELLA Raf.  Perennial herbs. Leaves alternate, with very 
thin ocreae. Flowers dioecious, in panicles, the hypanthium base conspicuously 
jointed to the curved pedicel. Sepals 6, essentially unchanged in fruit, without 
