558 cfpERActe^. (SEDGE 



2. D. latifolia, Baldw. Culms stout (2 -3 high), nearly terete ; leaves 

 broadly linear, elongated; leaves of the involucre 8-9, tapering from the 

 broad (3" -4" wide) base to the slender summit, becoming reddish ; nut round- 

 obovate, faintly wrinkled ; tubercle tlat, conical, obtuse, the sides decurrent on 

 the edges of the nut. Low pine barrens, Florida to North Carolina. May- 

 July. Heads larger than those of the preceding. 



18. CLADIUM, P. Br. 



Spikes ovate, I - 2-flowered. Scales loosely imbricated, the lower ones 

 empty. Perianth none. Stamens 2. Style 2-3-cleft, the divisions often 

 2-3-cleft, deciduous. Nut globose-ovate, the pericarp thickened and corky 

 near the apex. Tubercle none. Calms tall. Spikes disposed in axillary 

 and terminal cyme-like panicles. 



1 . C. effusum, Torr. ( SA W-GRASS.) Culms (4 - 8 high ) nearly terete ; 

 leaves linear, elongated, saw-edged ; panicles numerous, diffuse ; spikes small, 

 3 - 4 in a cluster, deep brown ; scales about 6, the uppermost bearing a per- 

 fect flower, the next below stamiiiiferous, the others empty; nut ovate, pointed, 

 wrinkled. (Sehceiius effusus, Swartz ) Fresh or brackish marshes along the 

 coast, Florida to North Carolina, and westward. Julv- August. 



2. C. mariscoides, Torr. Culms nearly terete ; leaves narrow-linear, 

 smoothish; panicles 2 -3, the few branches erect; spikes 3 - 8 in a cluster ; 

 nut ovate, acute, faintly wrinkled. (Schoenus, Muhl.) Grassy ponds, West 

 Florida, North Carolina, and northward. 



19. SCLERIA, L. NUT RUSH 



Flowers monoecious. Sterile spike few - many-flowered. Scales loosely im- 

 bricated in 2-3 rows. Fertile flowers solitary, separate or at the base of the 

 sterile spike. Stamens 1 -3. Style 3-cleft. Nut globose or ovate, stony or 

 bony. Chiefly perennials, with creeping rootstocks, and triangular leafy 

 culms. Spikes clustered, lateral and terminal. 



1. SCLERIA proper. Nut supported by an annular or 3 -6-lobed disk. 



* Nnt smooth : stamens 3. 



1. S. triglomerata, Michx. Culms stout, rough, sharply angled (2-3 

 high); leaves broadly linear, smooth or hairy; spikes disposed in 3 -6 clus- 

 ters at the summit of tho culm, and 1-2 distant lateral ones on long and 

 drooping peduncles ; disk forming a complete narrow ring at the base of the 

 globose-ovate yellowish white nut. Low grounds, Florida, and northward. 

 June - August. 



2. S. Oligantha, Ell., Michx.? Culms (l-2 high) slender, smooth, 

 sharply angled, often glaucous, like the smooth linear leaves ; spikes 3-5, sin- 

 gle, scattered, forming a terminal interrupted compound spike, and 1-2 dis- 

 tant lateral ones, on long drooping peduncles ; bracts leafy ; disk of 9 minute 

 globular lobes at the base of the white and polished ovate nut. Thickets 

 and margins of fields, Florida to South Carolina. July. 



