(SEDGE FAMILY.) 531 



1. L. Michauxii, Kunth. Leaves linear (!' -2' long), hairy, becoming 

 smoothish; scapes slender, hairy, 4-furrowed (1 high) ; heads globose ; bracts 

 aiid sepals spatulate, obtuse, fringed with white hairs ; divisions of the style 3, 

 each 2-cleft. Low grassy pine barrens, Florida to North Carolina. May - 

 June, growing in tufts. Heads 1" -3" wide. 



Var. minor. Scapes 2' -3' high; heads 1^'' wide. Low pine barrens, 

 Bristol, Florida. May -July. 



2. L. glabrum, Kornicke. Csespitose ; leaves linear, smooth (!' long) ; 

 scapes numerous, smooth, 5-furrowed (3' -5' high) ; heads globose, becoming 

 oblong, dark brown ; bracts and sepals spatulate-obovate, obtuse, slightly 

 fringed with short brownish hairs; divisions of the style 3, entire. Sandy 

 springy places, Florida, and westward. June - Oct. Heads 3" long. 



ORDER. 161. CYPERACEJE. (SEDGE FAMILY.) . 



Slender herbs, with simple solid mostly 3-angled stems (culms'), and 

 grass-like leaves, with closed sheaths. Flowers spiked, each in the 

 axil of a single (rarely 2-4) scale-like bract (scale). Perianth com- 

 posed of hypogynous scales or bristles, or none. Ovary 1-celled, with 

 a single erect anatropous ovule, forming in fruit a lenticular or 3- 

 angled achenium (nut), which is often crowned with the persistent 

 jointed base of the style (tubercle). Stamens 1-12: anthers erect. 

 Style 2-3-cleft or parted. Embryo minute at the base of the 



albumen. 



Synopsis. 



TRIBE I. CYPERE^D. Flowers perfect: spikelets 1 - many-flowered : scales one to 

 each flower, imbricated in 2 rows : perianth bristly, or none. 



* Perianth none : nut beakless. 



1. CYPERUS. Spikelets few -many-flowered : inflorescence terminal. 



2. KYLLINGIA. Spikelets 1-flowered : inflorescence terminal, capitate. 



* * Perianth bristly : nut beaked. 



3. DULICHIUM. Spikes lateral and terminal : spikelets many-flowered. 



TRIBE II. L,IPOCARPHE^E. Flowers perfect : spikes many-flowered : scales 2 -4 

 to each flower ; the exterior ones imbricated in many rows : perianth none. 



4. HEMICARPHA. Inner scale 1 : involucre mostly 1 -leaved, erect. 



5. LIPOCARPHA. Inner scales 2 : leaves of the involucre '2 or more, spreading. 



TRIBE III. SCIRPE-35. Flowers perfect : spikes commonly many-flowered : scales 

 one to each flower, imbricated in several (rarely 2) rows, all fruitful, or the lowest 

 empty : perianth bristly, hairy, or wanting. 



* Perianth of 3 bristles, alternating with 3 stalked scales. 



6. FUIRENA. Nut pointed : scales of the clustered axillary and terminal spikes awned. 



* * Perianth bristly, occasionally wanting. 



7. ELEOCHARIS. Nut tubercled : culms leafless, sheathed at the base, bearing one ter- 



minal spike. 



8. SCIRPUS. Tubercle none : culms mostly leafy at the base or throughout : spikes 



commonly numerous : perianth of 3 -6 bristles. 



9. ERIOPHORUM. Periautn of numerous long and woolly hairs : otherwise like Scirpua. 



