CYPERACE.E. (SEDGE FAMILY.) 513 



3. K. Tn.onoceph.ala, L. " Heads single, glolxjse, compact ; spikelets 

 I -flowered, monandrous, ovate, acuminate, the 2 superior scales striate, nearly 

 smooth on the sides, serrulate-ciliate on the keel, the 2 inferior minute ; nut 

 somewhat orbicular ; involucre 3-leaved, one of the leaves erect, the others hori- 

 zontal." Torr. Low moist places near Darien and Sunbury, Georgia. Rhi- 

 xoma creeping Culms 1 high. Head greenish, generally inclined. Leaves 

 abruptly pointed. 



3. DULICHIUM, Richard. 



Spikelets linear, compressed, many-flowered. Scales imbricated in 2 rows, 

 decurrent on the joints of the rachis. Perianth composed of 6 - 9 downwardly 

 hispid rigid bristles. Stamens 3. Style 2-cleft. Nut lanceolate, compressed, 

 long-beaked. Perennial. Culms terete, jointed, leafy. Leaves numerous, 

 3-ranked, linear or lanceolate, short and spreading. Spikes numerous, solitary 

 in the upper axils, simple or the lower compound. Spikelets 8- 14, 2-ranked, 

 spreading, 6 - 10-flowered. Scales lanceolate, many-nerved, closely imbricated. 

 Bristles nearly twice as long as the compressed or concave nut. 



1. D. spathaceum, Richard. Ponds and ditches, Florida, and north- 

 ward. Aug. - Sept. Culms 1 Q*- 2 high. Leaves- 1 ' - 3' long. Spikelets 6" - 

 12" long. Peduncles of the lower spikes longer than the sheaths. 



4. HEMICARPHA, Nees. 



Spikes many-flowered, ovate, one or few in a terminal (apparently lateral) 

 cluster. Scales imbricated in many rows, ovate or obovate. Inner scale single, 

 behind the flower, very thin, minute. Perianth none. Stamens 1-2. Style 

 2-cleft. Small tufted annuals with naked culms, narrow radical leaves, and an 

 erect mostly 1 -leaved involucre. 



1. H. subsquarrosa, Nees. Culms erect, nearly terete (2' -4' high); 

 leaf solitary, linear-subulate, concave, smooth, shorter than the culm ; involucre 

 1-2-leaved, the lower one erect and continuous with the culm, much longer 

 than the spikes, the other short and reflexed or wanting ; spikes 2 (rarely one), 

 seemingly lateral ; scales brown, ovate-oblong, reticulated, the stout, and greenish 

 midrib prolonged into a thick and obtuse erect point ; stamens 2 ; style deeply 

 2-parted, smooth; nut oblong-obovate, minutely pitted in lines. Low sandy 

 places, Florida, and northward. Aug. - Sept. Sheaths brown. Spikes 2"-3" 

 long. 



5. LIPOCARPHA, R. Brown. 



Spikes many-flowered, terete. Scales spatulate, imbricated in manv rows, 

 deciduous, the lowest empty. Interior scales 2, parallel to the exterior ones, 

 membranaceous, enclosing the flower and nut. Stamens 1-2. Style 2 -3-cleft. 

 Nut compressed, 3-angled. Culms jointlcss, leafy at the base. Spikes in a 

 terminal cluster. Involucre leafy. 



1 . L. maculata, Torr. Annual ; culms clustered, terete ; leaves much 

 shorter than the culm, linear, concave, smooth ; involucre 2 - 6-leaved, spreading 



