452 I CEAE 
accrescent into wings, the 2 ene ones eae d M at the base, the 3 
east pectinate-fimbria Sta 8: ents slender-filiform. 
pem 8- ange ineluded in the Mm io. EUM Dn are the only 
known spec 
Outer sepals becoming 2-2.5 mm. long: achene less than 2 mm. long, 
broadly ovoid. 1. T. fimbriata. 
outor “sepals 2 IDEE 3.5-4 mm. long: achene over 2 mm. long, 
wly ovoid. 2. T. robusta. 
1. T. fimbriata (Ell) A. Gray. Stem slender, 1.5-6 dm. tall, simple at the | 
base: leaf-blades narrowly linear, z^ x dong, mostly less than 1.5 mm. wide, 
few-striate: ocreae sparingly inged 
racemes 1-2.5 cm. long: outer S Cpistil- 
late) incised or incised-fimbriate, Eod 
j ache ee a 
ong: achene barely mde. short- 
beaked.—Sandhills, Coastal | Plain, NE Fla. 
to Ala. and Ga —Sum —fal 
robusta Mes Stem much Stouter 
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fringed: the To sometimes deciduou 
racemes mainly cm. long: outer-sopals 
(pistiliate) undulate A ac "i ch exceed- 
ing t : filaments mm. ie oo fully 1 mm. wide, long- 
peeked ead dd RUE pod Fla.—All yea 
9. POLYGONUM [Tourn.] L. Annual or perennial, erect or prostrate 
herbs. Leaves alternate, jointed near the top of the ultimately lacerate ocreae. 
wers in axillary elusters which are sometimes aggregated near the ends of 
the branches. pals green to pink or white, or green with il cages or yel- 
low, the outer ones een corrugated o pic. in age. Stamens 3-8, often 
—6. Stigmas Achene 3-angled.—Sum.—fall, or all year south d.—About 
100 species of wide dioe ns distribution.—K NOTWE DOORWEEDS. 
KNOTGRASSES. 
Flower-clusters — M! scattered more or less throughout the plant: stem and 
nee. d sharply angled: leaf-blades without impressions beside Eos midrib, 
not pli I. AVICULARIA 
Flower- clusters approximate on the upper part of the branches, 
thus forming long raceme-like panicles: stem sharply angled: 
leaf-blades with impressions on either side of the midrib, thus 
plicate. Ii. TENUIA. 
I. AVICULARIA 
Calyx green, or sepals with white, pink, or purplish margins. 
Plants copiously leafy throughout, the upper leaves only 
"ee Ped. in size 
e prominently exserted from the calyx: sepals 
rather petaloid. 1. P. glaucum. 
Achene included in the calyx or the mere tip exposed : 
sepals not petaloid. 
Achene vah striate faces. 
Mature perianth 3-4 mm. long: achene 3-4 mm. 
ong. 2, P. aviculare. 
Mature perianth 1.5-2 mm. long: achene 1.5-2 
"n P. neglectum. 
mm. long.. 
Achene with granular or nearly smooth faces. 4. P. buciforme. 
