CYPERACEAE 
II. SETACEAE 
E ed reticulate. 
H um 3-lobed, the lobes appressed to the achene- 
Achene 2m mm. s or E the body EU . S. d M E 
mm : se 
S. 
1 
pu 
© 
B 
Q8 
et 
— 
© 
c 
e 
[en 
ee 
res 
m 
c 
© 
Nn 
e 
(o 
B 
ct 
cub c5 
. Ñ. he oA 
H pon HL 3e a notched or 2- lobed tubercles: 
achene 2.5-8 vae 
Plant pubescent : : ac Hcc about 3 mm. long. 
ypogynium- bd 2-lobed: spikelet-scales pu- 
bescent on the back. 6. S. Elliottài. 
Hypogynium-tubercles entire or merely notched: 
spikelet-scales glabrous or besten on the keel. 7. S. ciliata. 
Plant glabrous: achene about 2.5 mm. lon 8. S. Brittonii. 
Hypogynium with 6 distinct tubercles : hence 1.5-2 mm. 
long. 9. S. pauciflora. 
III. GRACILES 
Achene 3 mm. long or less, with a pair of prominent pits on 
eaeh side of the base. 10. S. gracilis. 
Achene over 3 mm. long, Wi Boul pits, or with a single pit on 
each side of the bas 
Achene-body smooth d even, the base, each ya with 
a shallow excavation and often 2 obscure pits in it. 11. S. Baldwinii. 
Achene-body ribbed lengthwise, the base prominent, each 
side with a deep excavation, but without pits. 12. S. costata. 
IV. VERTICILLATAE 
Achene 2-2.5 mm. is ng. 13. S. lithosperma. 
Achene about 1.5 mm. lon 
chene-body Papilor er aged: bracts merely serrulate near 
e apex. 14. S. verticillata. 
Achene-body smooth : bracts with long spreading hairs. 15. S. hirtella. 
1. S. triglomerata Michx. Plant up to 1 m. tall, the stems somewhat scabrous, 
stout: leaf- apis flat, 3-9 mm. wide, scabrous: 'elusters of spikelets terminal, 
and usually 1 or 2 long-s stalked m pis 
the upper leaf- axils: achene abou 
long, the body ovoid to globose- A gs 
tuse, smooth and even, the hypogynium low, 
obscurely triangular, papillose- ao. NY, 
—(TALL NUT-RUSH.)—Moist to dry sandy 
soil, meadows, and thickets, various prov- 
inces, Fla. to Tex., Kans., Ia., and Vt. 
S. oligantha Michx. Plant up to 9 dm 
the upper : e about 3 
long, the body ovoid, sometimes narrowly E 
obtuse or aeute, smooth and even, the hypo- 
gynium low, obtu Md tr angular, suppo fae 8 or 9 tubercles just under the 
achene-body.—Moist soil, often in woods, Coastal. Plain and adj. provinces, Fla. 
to Tex., Ind., and D. C. 
S. p de Miehx. Plant 2-7 dm. tall, the stems smooth, slender: leaf- 
bia des mm. wide, smooth: clusters of spikelets terminal and usually also 
upper -axils: achene 2 mm. long or 
n 1-3 
les, ihe body dull- -white, globose, glabrous, reticulate, c hypogynium edt 
the lobes appressed to the achene-body.—Moist meadows, damp sand, and pine- 
lands, Coastal Plain and a m provinces, Fla. to Mo. and "Mass. hm Great Lake 
Lowland, "Ind.—( W. I., Mex.) 
