SEDGE FAMILY. 247 
2. KYLLINGA Rottb. Descr. & Ie. 12. Digew fuepide HL 773: 
Annual or perennial sedges, with slender triangular culms, leafy below, and with 2 or 
more leaves at the summit forming an involucre to the strictly sessile, simple or compound 
dense head of spikelets. Spikelets numerous, compressed, falling away from the axis of 
the head at maturity, consisting of only 3 or 4 scales, the 1 or 2 lower onessmall and empty, 
the middle one fertile, the upper empty or staminate. Joints of the rachis wingless or nar- 
rowly winged. Scales 2-ranked, keeled. Perianth none. Stamens 1-3. Style 2~-3-cleft, 
deciduous from the summit of the achene. Achene lenticular or 3-angled. [In honor of 
Peter Kylling, a Danish botanist of the seventeenth century. ] 
About 20 species, natives of tropical and temperate regions. Besides the following, 2 others 
occur in the southern United States. 
1. Kyllinga pumila Michx. Low 
Kyllinga. (Fig. 575.) 
Kyllingia pumila Michx. Fl. Bor, Am. 1: 28. 
1803. 
Annual, culms densely tufted, filiform, 
erect or reclined, 2’-15’ long, mostly longer 
than the leaves. Leaves light green, rough- 
ish on the margins, usually less than 1// 
wide, those of the involucre 3-5, elongated, 
spreading or reflexed; head oblong or ovoid- 
oblong, 3/’-4’’ long, simple or commonly 
with 1 or 2 smaller ones at the base; spike- 
lets about 114’” long, flat, 1-flowered, the 2 
empty lower scales more or less persisent on 
the rachis after the fall of the rest of the 
spikelet; scales ovate, acuminate or acute, 
thin, about 7-nerved; stamens 2; style 2-cleft; 
achene lenticular, obtuse. 
In moist or wet soil, Virginia to Florida, west 
to Illinois, Missouri, Texas and Mexico. Aug.— 
Sept. 
3. DULICHIUM |,. C. Richard; Pers. Syn. 1:65. 1805. 
A tall perennial sedge, with terete hollow jointed culms, leafy to the top, the lower 
leaves reduced to sheaths. Spikes axillary, peduncled, simple or compound. Spikelets 
2-ranked, flat, linear, falling away from the axis at maturity (?) many-flowered. Scales 
2-ranked, carinate, conduplicate, decurrent on the joint below. Flowers perfect. Perianth 
of 6-9 retrorsely barbed bristles. Stamens 3. Style 2-cleft at the summit, persistent as a 
beak on the summit of the achene. Achene linear-oblong. [Name said to be from Dulci- 
chimum, a Latin name for some sedge. | 
A monotypic genus of eastern North America. 
1. Dulichium arundinaceum (L,.) 
Britton. Dulichium. (Fig. 576.) 
Cyperus arundinaceus I,. Sp. Pl. 44. 1753. 
Cyperus spathaceus I,. Syst. Ed. 12, 2: 735. 1767. 
Dulichium spathaceum Pers. Syn. 1:65. 1805. 
Dulichium arundinaceum Britton, Bull. Torr. 
Club, 21: 29. 1894. 
Culm stout, 1°-3° tall, erect. Leaves num- 
erous, flat, 1/-3’ long, 2/’-4’’ wide, spreading 
or ascending, the lower sheaths bladeless, 
brown toward their summits. Spikes shorter 
than or the uppermost exceeding the leaves; pe- 
duncles 2’/-12’’ long; spikelets narrowly linear, 
spreading, 6/’-12’’ long, about 1/’ wide, 6-12- 
flowered; scales lanceolate, acuminate, strongly 
several-neryed, appressed, brownish; bristles of 
the perianth rigid, longer than the achene; 
style long-exserted, persistent. 
In wet places, Nova Scotia to Ontario and Min- 
nesota, south to Florida and Texas. Aug.—Oct. 
