504 CYPERACE.&. (SEDGE FAMILY.) 



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

 fringed with club-shaped hairs. 



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

 smoothish; scapes slender, hairy, 4-furrowed (lhigh); 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. L. 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^E. (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 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. 



TKIBE I. CYPERE^E. 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. JJIPOCARPHEJE. 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. JJPOCARPHA. Inner scales 2 : leaves of the involucre 2 or more, spreading. 



TRIBE III. SCIRPE-33. 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. 



