494 CYFERACEJE. (SEDGE FAMILY.) 



16. C. OrsYyii, Torr. Culm thread-form, wiry (6'- 12' high) ; leaves nearly 



bristle-si taped, channelled; umbel simple, 4-G-rayed; spikes 5-10 in a loose head, 

 spread! inj, 5 - 7-flowercd, the joints of the axis winyed ; scalar n itlx r ubtum , 

 ish-chestnut-color; achenium obovatc, minutely pointed. Barren sandy soil, 

 llhode Island to New Jersey, near the coast. Aug. (Approaches the next.) 



17. . CliculllliS, Viihl. Culm slender, wiry, often reelincd (8' -15' 

 high ) ; leaves linear ( 1 " - 2" wide) ; spikes numerous and clunf- ml in out- sessile dense 

 head, or in 1 - 3 additional looser heads on spreading rays, 6 - 10- flowered ; joints of 

 the axis naked ; scales blunt, greenish ; achenium obovate, short-pointed. (C. mu- 

 riscoide.i, Ell.) Dry sterile soil; common, especially southward. An-. 



I 4. MARf SOUS, Vahl. Style 3-cle/l : the achenium triamjnlur : stamens 3 

 spikes 1 -feic-Jiowcred, scarcely flattened ; the 2 lower scales short and empty : oth- 

 erwise as in 3. 



18. C. oviiSfaris, Torr. Smooth; culm sharply triangular (6' -12' high); 

 umbel 1-6-raycd; spikes in globular dense heads, 2-4-jlotwed, short and thick: 

 joints of the axis winged ; scales ovate, blunt, greenish ; achenium obovoid. y. 

 (Kyllingia, Afic/ix.) Sandy soil, S. New York to Illinois and southward. 

 Aug. -Oct. Heads barely ' in diameter, of 50-100 spikes. 



19. C. TOtrofr&CtUS, Torr. Culm minutely doimy like the leaves, rough 

 on the obtusish angles (l-3high); umbel many-rayed; spikes slender, mat* 

 tfiaped, very numerous in obovate or oblong heads terminating the elongated 

 rays, soon reflcxed, \-1-flowered in the middle; scales usually 4 or 5, the two 

 lowest ovate and empty, the fertile lanceolate, the uppermost involute-awl-sliaped ; 

 achenium linear. 1J. (Scirpus retrofractus, L.) Sandy fields, New Jersey to 

 Virginia, and southward. Aug. Spikes ' long, 50-100 in a head, greenish. 



2. KYLLINGIA, L. KYLLINGIA. 



Spikes of 3-4 two-ranked scales, 1 -l-flowered; the 2 lower scales minuto 

 and empty, as in Cypcrus4, otherwise as in Cyperus $ 1 (viz. style 2-cleft; 

 achenium lenticular) : but the numerous spikes densely aggregated in solitary 

 or triple sessile heads. Involucre about 3-lcaved. (Named after Kylliiig, a 

 Danish botanist.) 



1. K. pilillila, Michx. Head globular or 3-lobed, whitish-green (4" 

 broad); spikes strictly 1-flowcrcd; upper scales ovate, pointed, rough on tlve 

 keel; stamens 2; leaves linear. Low grounds, Ohio to Illinois, and southward. 

 Aug. Culms 2' -9' high. 



3. DUL,iCIHUM, Richard. DULICHIUM. 



Spikes many- (6 -10-) flowered, linear, flattened, sessile in 2 ranks on axillary 

 solitary pnluwles emerging from the sheaths of the leaves. Scales 2-ranked, 

 lanceolate. Perianth of 6-9 downwardly barbed bristles. Stamen' 3. Stylo 

 2-cleft above. Achenium flattened, linear-oblong, beaked with the Ic.ng persist- 

 ent style. A perennial herb, with a terete simple culm (l-2 high), jointed 

 unri leafy to the summit; the leaves short and flat, linear, 3-ranked. (The 

 oi a Greek island; its application unexplained.) 



