CYPERACE-*. (.EDGE FAMILY.) 523 



2. I. Ciliatifolia, Torr. Culms tufted, filiform, angled (6'- 12' high); 

 leaves bristle-form, hi>pid oa the edges, the sheaths bearded at the throat; um- 

 bel compound; spikes several (l"-2" long), 6 - 12-flowcred, linear-oblong; 

 scales oval, strongly keeled, brown on the sides ; nut obovatc, very obtuse, 

 nearly equal-sided, obscurely wrinkled. (Scirpus ciliatifolius, Ell.) — Dry sandy 

 places, Florida to North Carolina. Aug. and Sept. 



3. I. COarctata, Torr. Culms (1° high) terete, filiform ; leaves bristle- 

 form, smooth, with the sheaths bearded; umbel compound, contracted; spikes 

 (3" long) linear-oblong, 10- 15-flowercd ; scales ovate, acutish, imbricated in 4 

 row-; : nut ilat on the inner face, obtuse-angled in front, obscurely dotted. (Scir- 

 pus coaretatus, Ell.) — Dry sandy soil, Georgia and South Carolina, near the 

 coast. Sept. and Oct. — Rays of the umbel ~\' long. 



* * Spikes clustered in a terminal head. 



4. I. Stenophylla, Torr. Culms (2'- 4' high) densely tufted, 3-angled, 

 and, with the bristle-form leaves and involucre, bristly-eiliatc ; involucre much 

 longer than the head, 3-4-leaved, dilated and ciliate at the base; spikes 4-6, 

 oblong-linear, 8-10-flowered; scales lance-ovate, slender-pointed, hispid on the 

 3-nerved keel ; nut (bluish) obovate, obtuse, wrinkled. (Scirpus stenophyllus, 

 Ell.) — Dry sandy soil, Florida to North Carolina. Aug. and Sept. 



5. I. Warei, Torr. Culms filiform (l°-U° high), smooth, 3-angled, 

 much longer than the bristle-form hispid leaves ; sheaths bearded at the throat 

 with long silky hairs; leaves of the involucre rigid, twice as long as the head, 

 orbicular and cut-fringed at the base; spikes 8- 10 in a head, ovate, many-flow- 

 ered ; scales ovate, mucronate, many-nerved ; nut obovate, obtusely angled, 

 obscurely wrinkled. — Dry sands near the coast, "West Florida. Sept. — Heads 

 £' in diameter. 



13. ABILDGAARDIA, Vahl. 



Spikes many-flowered. Scales imbricated in 2 or (by the twisting of the 

 rachis) 3 rows, keeled, decurrent on the rachis, deciduous. Perianth none. 

 Stamens 1-3. Style 3-cleft, tumid at the base, deciduous. Nut 3-angled. — 

 Culms jointless, leafy at the base. Spikes solitary, clustered or umbelled. 



1. A. mono Stachya, Vahl. Culms filiform, tufted (8'- 10' high) ; leaves 

 shorter than the culm, filiform, obtuse, concave; spikes solitary (rarely by pairs), 

 ovate, acute, compressed, 8- 12-flowered, much longer than the bract-like mu- 

 cronate 1 -leaved involucre ; scales broadly ovate, acute or mucronate, compressed- 

 keeled, with broad and white margins; stamens 3; nut somewhat pear-shaped, 

 3-angled, warty, yellowish-white. — South Florida, Dr. Blodyett. 



14. RHYNCHOSPORA, Vahl. Beak-Rush. 



Spikes 1 -several-flowered. Scales imbricated in few rows, the lowest empty, 

 the upper usually bearing imperfect flowers. Perianth of 3 - G (rarely 12-20) 

 hispid or plumose bristles, occasionally wanting. Stamens mostly 3. Style 

 2-cleft. Nut lenticular or globose, crowned with the dilated and persistent base 



