504 CYPERACE^. (SEDGE FAMILY.) 



sule 2-3-celled. — Habit of the two preceding. Bracts and sepals blackieh, 

 fringed with club-shaped hairs. 



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

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

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

 each 2-cleft. (Eriocaulon villosum, Michx.) — Low grassy pine barrens, Florida 

 to North Carolina. May and June, growing in tufts. — Heads 2" wide. 



2. It. glabrum, Kornicke. Leaves linear, smooth (1' long) ; scapes numer- 

 ous, 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, St. An- 

 drews Bay, West Florida. Oct. — Scapes 30 or more in a cluster. Heads 3" 

 long, not unlike those of Eleocharis obtusa. 



Order 159. CYPERACE.^. (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 composed 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 oflen crowned with the persistent jointed base of the style 

 (tvhercle). Stamens 1-12: anthers erect. Style 2-3-cleft or parted. 

 Embryo minute at the base of the albumen. 



Synopsis. 



Tribe I. CYPGRE.^. — 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. KYLLINGrlA. Spikelets 1-flowered : inflorescence terminal, capitate. 



* * Perianth bristly : nut beaked. 



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



TkibeII. IiIPOCARPHE.X:. — Flowers perfect: spikes many-flowered: scales 2-4 

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



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



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



Tribe III. SCIRPE.^. — 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 terminal 



spike. 



