504 CYPERACEJS. (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 (1'- 2' long), hairy, becoming 

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

 and sepals spatulatc, obtuse, fringed with white hairs ; divisions of the stvle 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 Elcocharis obtusa. 



Order 159. CYPERACE^l. (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 

 hypogvnous scales or bristles, or none. Ovary 1-eelled, with a single 

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

 (?iut), which is often crowned with the persistent jointed base of the Btyle 

 (tubercle). Stamens 1-12: anthers erect. Style 2-3-eleft or parted. 

 Embryo minute at the base of the albumen. 



Synopsis. 



Tribe 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. 

 8. DULICIIIUM. Spikes lateral and terminal : spikelets many-flowered. 



Tribe II. LIPOCARPHEJE.- Flowers perfect: spikes many-flowered: scales 2-4 

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



4. IIKMM 'A I: I'll A. Inner scalo 1 : Involucre mostly 1-leavod, erect. 



5. I.I I'< n A i: I'll A. Inner scales 2: leaves of the involucre 2 or more, spreading. 



Tiuiik 1 1 1. SCIRPE^E. — Flowers perfect : spikes commonly many-flowered : scales one 

 to each flower, imbricated in several (rarely 2) rows, all fruitful, or the lowwt empty : 

 perianth bristly, hairy, or wanting. 



• Perianth of .1 bristles, alternating with 3 stalked scales. 

 8. II IKKNA. Nut pointed : scales of the clustered axillary and terminal spikes awncd. 



» • Perianth bristly, oooationallj wanting 



7. I'.I.K'" II A HIS. Nut tubercled : culms leafless, sheathed at the base, bearing one terminal 



■pike. 



