POLYGONACEAE 451 
Achene ellipsoid-ovoid ; hypanthium-base obconic; upper 
ocreae leaf-bearing ; fruiting calyx persistent. 
Achene Te late; hypan nthium-base clavate; upper ocreae 
eafless : fruiting calyx deciduous. . D. basiramia. 
Inner sepals Da) elliptic or elliptic- -obovate at ma- 
rity: ocreae ecili 
Tider cence rachis with separated ocreolae: stem-leaves 
c 
D. ciliatum. 
with filiform blades 9. D. filiforme. 
inHorescenco Fa with contiguous ocreolae : stem-leaves 
with elliptic, spatulate or linear-spatulate blades. 4, D. gracile. 
Inner and outer sepals about equal in length at maturity : achene 
acute, the tip barely exserted from the a stipe-like base 
the hypanthium filiform or filiform-clavat 5. D. articulatum. 
1. - ie tum (Meisn.) Small. Stem 6-17 dm. tall: stem-leaves with stiff 
filifo r linear-filiform blades 2—4 cm. c oereolae acuminate: hypanthium- 
s E rbinate s pm than 1 mm. long: sepals 
(st te) or nearly so: inner 
bii pes becomin ng 1.5 mm. long, 
uch longer than achene about 
th 
m. long, slightly don um the ealyx.— 
Pinelands, pen. Fla.—Sum.-fall. 
2. D. basiramia Small. Stems and pi is 
m or many (10-70) from the b. of a 
oody tap- ae slender wiry-filif pale 
inflorescene stem-leaves slenderly TEN 
ostly 1- em. lon aeute, et 
hypanthium-base clavate, "nearly 1 mm. long 
maturity: sepals of the s ‘lowers 
spatula to linear, the about e 
ong, much excee edin ing “ont ie 
subulate, fully 2.5 mm. ee hrice as eae as thick, much exceeding the ed 
investing calyx.—Inland sand-dunes and scrub, S end of the lake region, Fla 
D. filiforme -o Stem 9-16 dm. tall: per leaves with pliable filiform 
blades 4-9 em. nS us smaller than aee graci dd Ras nthium-base 
turbinate, very sh aped ova BE mE ng t Or abo ovate; 
inner sepals (pistillate) "oblong pee DE. obovate slightly ice than the 
aa becoming 1.5 mm. long: . long, the tip much a d. 
Fus uini -— Sandhills "ud hs ee "Plain, E pen. Fla. to Ga. 
um.—fal 
4. D. gracile (Nutt.) Small. Bini 3-17 dm. tall: stem- adr with oblong, 
ue Or a dicis bns 1-2.5 em. long: hypanthium-base turbinate, 
very short: sepals (staminate) obovate; inner T biete) Moe 
mm. long, decidedly longer than ica outer: achene 2.5 mm. long, slightly 
exceeding the calyx.—Dry pinelands and sandhills. ee Plain, Fla. to 
and S. C.—Sum.—fall. 
5. D.articulatum (L.) Small. Stem 1-4.5 dm. tall: stem-leaves with n 
linear or linear- sarang pii 1-2.5 em. long: stipe-like base of the hypan 
.thium slender, ut . long: inner sepals Pa Aa aa 2 mm 
long, obovate S orbicular- So achene rhombic-ovoid, mm. lon ng.— 
(JorNTWEED.)—Acid sandy and open woods, Coas tal done ond New England 
Coast, Ga. (or Fla.) to Me.; also Great Lake Lowland, Ill. to N. Y.—Sum.—fall. 
8. THYSANELLA A. Gray. es Mares male Leaves alternate, 
jointed near the top of the fringed firm Flowers polygamo-monoecious, 
those of the upper racemes mostly ae Sepals white or pink, not 
