476 
21. R. inexpansa Vahl. Stems nearly terete, slender, 3 to 9 dm. high: leaves 
narrowly linear: corymbs 4 or 5, narrow, remote, compound, drooping: spikelets 
scattered, lanceolate: bristles 6, very slender, twice as long as the linceolate-oblong 
compressed achene, which is twice as long as the conical-beaked tubercle.--South 
Atlantic States to Texas (near Sabine Pass). 
11. CLADIUM P. Browne. (‘TWiG-RUSH.) 
Stems tall, with ovoid or oblong spikelets of several loosely imbricated 
scales (the lower empty, 1 or 2 above bearing a staminate or imperfect 
flower, the terminal flower perfect and fertile), no perianth, 2 stamens, 
Zor 3-clett deciduous style, and an ovoid or globular achene somewhat 
corky at summit, or pointed, but without any tubercle. 
1. C. effusum Torr. Stems 12 to 24«dlm. high, nearly terete: leaves linear, elon- 
gated, saw-edged: panicles numerous, diffuse: spikelets small, 3 or 4 in a cluster, 
deep brown: scales about 6: achene ovate, pointed, wrinkled.—Fresh or brackish 
marshes, along the whole Gulf coast, and extending to the southwestern borders of 
‘Texas. Known as ‘saw-grass.” 
12. SCLERIA Berg. (NutT-RUSH.) 
Perennials, with triangular leafy stems mostly from creeping root- 
stocks, inflorescence of terminal and axillary clusters (the lower clusters 
usually peduncled), monoecious flowers (fertile spikelets 1-flowered, 
usually intermixed with clusters of few-flowered staminate spikelets), 
oosely imbricated scales (lower empty), 1 to 3 stamens, 3-cleft style, no 
bristles, and a globular achene, stony, bony, or enamel-like in texture. 
Allin low ground or swamps. 
* Achene smooth. 
1. S.triglomerata Michx. Stems (4.5to 9dm. high) and broadly linear leaves rough- 
ish: fascicles of spikelets few, the lowest peduncled, the upper somewhat in threes: 
achene ovate-globose or depressed, on an obscure crustaceous disk.—Eastern United 
States, and extending into Texas. 
2. S.oligantha Ell. Stems slender, 6dm. high, the angles somewhat winged: leaves 
linear (4mm. wide), smooth except the scabrous apex: lateral fascicles 1 or 2, usually 
on long exserted peduncles: achene ovate, on a tuberculate disk.—South Atlantie 
States to Texas. 
** Achene papillose or reticulated and wrinkled, 
3. S. pauciflora Muhl. Smoothish or hairy: stems slender, 20 to 60 em. high: 
leaves narrowly linear: fascicles few-flowered, the lateral pedunculate, sessile, or 
wanting: bracts ciliate: achene globose-ovate, papillose or warty: the disk a narrow 
ring bearing 3 pairs of minute tubercles.—Kastern United States and extending into 
Texas, 
4. S. Torreyana Walpers. Stems weak, diffuse, slightly scabrous or smooth: 
leaves linear (4 to 8 mm. wide), smooth: lateral fascicles loose, on more or less elon- 
vated and drooping filiform peduncles: achene irregularly pitted-reticulated or 
pitted-rugose with the ridges somewhat spirally arranged and more or less hairy 
(sometimes smooth). (S. lava Torr.)—Pine-barrens from the south Atlantic States 
to Texas. 
13. CAREX Ruppius. (SEDGE) 
By L. H. BAILEY. 
Perennial grass-like herbs, with 5-ranked leaves and mostly triangular 
stems, unisexual flowers borne in spikes and destitute of floral envelopes, 
the staminate consisting of three stamens borne in the axil of a bract or 
