CYPERACEAE 195 
barbed: achenes obovoid, above the slender base, lenticular, about 1.5 mm. long, smooth, 
dark brown ; tubercle subulate, about as long as the achene. 
In moist soil, Maine to Ontario, Michigan, Florida and Texas. Summer and fall.—A relatively 
stout variety, with stems 1-1.5 mm. tall, wider leaf-blades, numerous spikelets in compound clusters 
and achenes 2 mm. long, is R. glomerata paniculàta (A. Gray) Chapm.; it ranges from Maryland to 
Florida and Louisiana. A relatively slender form, with stems only 6-9 dm. tall, and few distant simple 
peduncled clusters is R, glomerata leptocárpa Chapm.; it ranges from South Carolina to Florida and 
Alabama. A third variety, R. glomerata discütiens Clarke, has smooth bristles or these barbed only near 
the apex, and a known range from New Jersey to North Carolina. 
15. Rynchospora axillàris (Lam.) Britton. Perennial. Stemsstout, 5-10 dm. tall : 
leaf-blades nearly flat, keeled, 2-3 mm. wide: spikelets spindle-shaped, 5-6 mm. long, 
numerous, in several short-peduncled axillary and terminal dense globose heads some- 
times 2 cm. in diameter: scales dark brown, ovate-oblong, acute: perianth-bristles 6, 
downwardly barbed: achenes broadly obovoid above the contracted base, 2.5 mm. long, 
brown, smooth, lenticular ; tubercle subulate, about as long as the achene. 
In swamps, Long Island to Florida and Louisiana. Summer and fall. 
16. Rynchospora microcéphala Britton. Perennial, deep green. Stems tufted, 
slender, 3-14 dm. tall, smooth : leaves overtopped by the stem ; blades linear-filiform, in- 
volute, smooth : spikelets numerous, 3-3.5 mm. long, crowded into 2-4 short-peduncled 
compact globose heads about 1 em. in diameter or smaller: scales acuminate, smooth, 
chestnut-colored : perianth-bristles 6, downwardly barbed: achenes lenticular, obovoid, 
1.5 mm. long, smooth, margined; tubercle shorter than the achene, subulate-lanceolate. 
[R. axillaris var. microcephala Britton. ] 
In swamps or low grounds, New Jersey to Florida and Louisiana. Spring to fall. 
17. Rynchospora fuscoides Boeckl. Perennial, bright green. Stems tufted, 1.5-7 
dm. tall, slender: leaves several, chiefly at the base of the stem; blades flat, smooth : 
spikelets 2-2.5 mm. long, in small often geminate terminal clusters and on robust plants 
with an additional one lower down the stem : perianth-bristles 6, barbed upward : achenes 
lenticular, smooth, about 2 mm. long excluding the subulate conic ciliate tubercle, mostly 
surpassed by the bristles. 
In low pine lands, Florida to Texas. Alsoin Cuba. Spring to fall. 
18. Rynchospora Curtissii Britton. Stems filiform, glabrous, 1-2 dm. tall: leaves 
few ; blades filiform, less than 0.5 mm. wide, much shorter than the stem: spikelets few 
or solitary, in 1-3 loose clusters, oblong, acute at both ends, 4-6 mm. long: scales ovate- 
oblong, chestnut-brown, keeled, mucronate: perianth-bristles 6, slender, downwardly 
barbed, much overtopping the achene: achenes linear-oblong, nearly 1.5 mm. long, light 
brown, smooth, lenticular ; tubercle compressed, lanceolate, ciliate, dark brown, fully 3 as 
long as the achene. 
In bogs, Milton, Florida. Summer. 
19. Rynchospora filifdlia Torr. Perennial, bright green. Stem tufted, 1.5-6 dm. 
tall, nearly terete, filiform or very slender: leaves numerous at the base of the stem ; blades 
filiform or bristle-like: spikelets aggregated into 2-4 capitate clusters, lanceolate in out- 
line, 3-3.5 mm. long: perianth-bristles barbed upward, rather rigid, not longer than the 
achene and tubercle or scarcely so: achenes lenticular, obovoid, margined, smooth and 
shining, light brown, less than 1 mm. long ; tubercle flat, ciliate, triangular. 
About pine-land ponds, North Carolina to Florida and Texas. Spring to fall. 
20. Rynchospora leptorhyncha C. Wright. Perennial, bright green. Stems tufted, 
slender, 3-6 dm. tall: leaves erect; blades involute, filiform or linear-filiform, curved, 
smooth : spikelets lanceolate in outline, about 5 mm. long, acute, several together in 2 or 
3 rather loose capitate clusters: perianth-bristles 6, not longer than the achene and tubercle 
or scarcely so: achenes orbicular-obovoid or obovoid-oval, 1.5-2 mm. long, smooth, each 
capped by a lanceolate ciliate dark brown tubercle. 
In grassy pine woods, Florida and Cuba. Spring to fall. 
21. Rynchospora dístans (Michx.) Vahl. Perennial, pale green. Stems tufted, 
slender, 3-7 dm. tall: leaves several at the base of the stem ; blades filiform or nearly so 
by the involute margins : spikelets ovoid, about 3 mm. long, several together in terminal 
and axillary clusters : perianth-bristles mostly 6, usually upwardly barbed, about as long 
as the achene : achenes oval or oblong-oval, 1.5-2 mm. long, excluding the broad conie 
smooth tubercle. 
In pine lands, South Carolina to Florida. Spring to fall. 
22. Rynchospora gracilénta A. Gray. Stems slender or filiform, smooth, 3-5 dm. 
tall: leaf-blades flat or becoming involute in drying, rather less than 2 mm. wide, shorter 
than the stem : spikelets narrowly ovoid, acute, 4 mm. long, few, in 1-4 loose clusters, the 
lower clusters filiform stalked: scales ovate, brown: perianth-bristles 6, upwardly 
