512 CYPERACE.E. (SEDGE FAMILY.) 



flowered ; scales (greenish or yellowish ) oblong, obtuse, mucronate, closely im- 

 bricated ; nut oblong; culms (l-2 high) obtuse-angled, longer than the linear 

 leaves. (Mariscus echinatus, Ell.) Cultivated ground, Florida to North Caro- 

 lina, and westward. July - Sept. Spikelets 3" - 6" long. 



34. C. divergens, Kunth. Umbel none ; head globose, shorter than the 

 4-leaved involucre ; spikelets ovate-lanceolate, flat, acute, 5 - 7-flowered ; scales 

 ovate, mucronate, compressed-keeled, 7-nerved, the scarious sides broadly dccur- 

 rent; style deeply 2- 3-parted ; stamens 2-3; nut (immature) oblong, lenticu- 

 lar or 3-angled; culms low (2'- 3'), tufted, obtuse-angled, shorter than the 

 smooth keeled leaves. Damp cultivated grounds, Quincy, Middle Florida. 

 August. Head 3" - 4" in diameter, composed of 3 - 4 compact clusters ; spike- 

 lets 1" long, white. 



$ 3. PAPYRUS. Style 3-cleft: nut 3-angled: scales of the rachis at length free and 

 deciduous. Inflorescence as in No. 7. 



35. C. erythrorhizos, Muhl. Umbel 3- 12-rayed, simple or compound, 

 shorter than the 3 -10-leaved involucre ; spikelets very numerous, narrow-linear, 

 compressed, spreading, 12-50-flowered; scales minute, oblong-ovate, obtuse, 

 greenish and faintly nerved on the back, yellowish and glossv on the sides ; 

 scales of the rachis lanceolate, acute ; nut oval, compressed-3-angled, smooth 

 and shining ; culms obtuse-angled ; leaves rough on the margins, pale beneath ; 

 involucels leafy, longer than the spikes. (C. tenuiflorus, Ell.) Ponds and 

 ditches, Florida, and northward. July - Sept. (1) Culms - 4 high. Leaves 

 1"- 14" wide. Spikelets 2" - 8" long. 



2. KYLLINGIA, L. 



Spikelets compressed, mostly 1-flowercd. Scales commonly 4, imbricated in 

 two rows, the two lower ones small and empty, the third perfect, the fourth im- 

 perfect Perianth none. Stamens 1-3. Style elongated, 2-cleft. Nut lentic- 

 ular. Culms jointless, 3-angled, leafy at the base. Involucre 3 - 5-leavcd. 

 Spikelets collected in single or clustered sessile heads. Plants odorous. 



1. K. pumila, Michx. Heads (green) mostly 3, globose or ovate ; spike- 

 lets 1-flowered, ovate-lanceolate, acute at each end ; scales 3, the lowest minute, 

 the middle one ovate, compressed, mucronate, mostly serrulate on the keel, en- 

 closing the upper one ; nut obovatc ; stamens 2 ; culms weak, acute-angled ; 

 leaves and 3 - 4-leaved involucre linear. Wet places, Florida to North Caro- 

 lina. July - Sept. CD Culms tufted, 4' - 10' high. 



2. K. sesquiflora, Torr. Heads (white) 1 - 3, ovate or oblong ; spikelets 

 ovate-oblong, acute, 1-flowered, or imperfectly 2-flowered ; scales 4-5, the two 

 lower ones minute, the third and fourth alike, ovate, acute, smooth, the fifth en- 

 closed in the fourth ; stamens 2 ; nut obovate ; culms erect, obtuse-angled ; leaves 

 and 3 - 5-leaved involucre broadly linear. Low exposed places and along roads, 

 Middle Florida. Aug. -Sept. 1J. Culms 4' -12' high. Plant pale green, 

 pleasant-scented. 



