458 POLYGONACEAE 
12. FAGOPYRUM [Tourn.] Gaertn. Annual erect smooth herbs, the 
stems terete. Leaves alternate, not jointed at the oblique ocreae: blades has- 
ate or cordate at base. Flowers borne 
in branching raceme-like panicles. Sepals 
white, 5, almost unchanged at maturity. 
Stamens 5-8: filaments filiform. Saas 
Achene 3-angled, exserted.—About 6 species, 
Eurasian 
F. Fagopyrum (L.) Karst. Stem 1-9 
n tall, slightly pubescent a about the nodes: 
.5—3.5 mm. long: achene 5-6 mm. long.— 
(BUCKWHEAT. )- Fields, odes and waste- 
nr U. S. and S Can. Nat. of Eu.— 
(W. I.)—Sum 
13. TRACAULON Raf. Annual or. perennial, prickle-armed, with the 
sia reflexed, a -climbing herbs. Leaves alternate, not jointed at the 
oblique ocreae. Flowers borne in spike-like or capitate s Sepals often 
slightly colored, 5 or d. neither keeled nor winged. Stamens 5-8: filaments 
slender. Stigmas 2 or 3. Achene lenticular or 3- etn ‘nti ——About 18 
species North American and Asiatie.— TlEARTHUMBS. Rak 
Leaf-blades sagittate: achenes 3-angled. 1. T. sagittatum. 
Leaf-blades hastate: achenes lenticular. 2. T. arifolium. 
l. T. sagittatum (L.) Small. Leaf-blades lanceolate- -agittate to elliptic- 
Piana Vies em. long, the basal pun eun ocreolae 3-5 mm. long: perianth 
becoming m. long: be mens 8: e 3— 
3. 5 mm. lo ine ( ARROW-VINE.)— Wet places 
and meadows, various A Fla. to Tex 
Sask., Ont., and Newf.—Sum.—fal 
2. 'T. d (L.) Raf. Leaf-blades has- 
tate, 2-18 cm. long, the pe ge md 
acuminate: ocreolae 
becoming 4—5 mm. ee poi 6: pine 
4 mm. lo ong.—(SCRATCH-GRASS.) —W et thick- 
ets and meadows, various provinces, Ga. to 
Minn. and .—Sum.—fall—tThe calyx in 
both species ranges from white to greenish 
or red-tinged. 
. BILDERDYKIA Dum. Annual or perennial, unarmed twining vines. 
Leaves alternate, not jointed at the oblique ocreae. owers borne in branch- 
ing raceme-like panicles or in axillary clusters. Sepals iss or yellowish, 5, 
the outer ones keeled or winged at maturity. Stamens 8: filaments slender. 
Stigmas 3. Achene 3-angled, included. [Tiniaria Webb & Moq.]—About 8 
. species, North American and As iatic.—Sum.—fall.—NIMBLE-WILLS. 
