50G 



CYPERACTLE. (SEDOS FAMILY.) 





high ; leaves and 3-leaved involucre narrowly linear. (C. faseiculatus, 257/.?) — 

 Low grounds, Florida, and northward. July and Aug. 



2. C. rivularis, Kuntli. Umbel of 3 - 4 rays, one or two of them longer 

 than the Bpikeletsj spikelets 3-6 in a cluster, oblong-linear, acute, many-flow- 

 ered; scales pale straw-color, ovate, obtuse, appressed ; rachis margined; sta- 

 mena 2; nut round-obovate, transversely roughened, black and shining; culms 

 6'- 12' high, slender; leaves and 3-leaved involucre linear. — Marshy banks of 

 stream;, Georgia, Florida, and westward. Aug. 



.3. C. diandrus, Torr. Umbel of 2-5 short and unequal rays, the longer 

 ones longer than the spikelets; spikelets lanceolate-oblong, acute, brownish or 

 dark brown, spreading ; scales ovate, obtuse, appressed, green on the keel ; 

 rachis margined; stamens 2; nut oblong-obovate, rough ish, dull gray. — We* 

 places, North Carolina, and northward. Aug. — Culms 4'- 10' high. Invo- 

 lucre. 3-leaved. This and the preceding are probably only diandrous forms of 



No. 1. 



* ■* Spikelets scattered on the common rachis (spiked). 



4. C. Wuttallii, Torr. Umbel sessile or of 3-6 rays, l'-2' long; spike- 

 lets numerous on the rays, spreading, linear-lanceolate, acute, light or yellowish 

 brown, 12 - 20-flowcred, the lower ones commonly compound; scales rigid, ob- 

 long-ovate, acute or mucronate, appressed ; stamens 2 ; nut oblong-obovate, 

 very obtuse, grayish and minutely pitted; culms clustered, 3-angled, 4' -l.V 

 high ; leaves and involucre narrowly linear. (C. flavcscens, Ell. C. holoserieeus, 

 Link.f) — Salt or brackish soil, Florida, and northward. July -Sept. — Plant 

 commonly yellowish and glossy throughout. Spikelets rarely crowded in a 

 terminal head. 



5. C. flavicomilS, Michx. Umbel compound, many-rayed ; spikelets very 

 numerous, crowded, linear, acute, 12-30-flowered ; scales loosely imbricated, yel- 

 lowish, round-obovate, emarginatc, with broad and scarious margins, at length 

 spreading; rachis broadly margined; stamens 3; nut obovatc, black, smooth 

 and shining, barely shorter than the scale; culms thick, obtuse-angled, l°-3° 

 high; leaves broadly linear, glaucous beneath, as long as the culm. — Low 

 grounds and ditches, Georgia and South Carolina. May -Sept. — Involucre 

 3-5-leaved. Spikelets 6" -9" long. 



0. C. microdontus, Torr. Umbel of 4 - 8 rays, simple or somewhar 

 compound; spikelets numerous, crowded, linear, acute, 1 5 - 25-flowered, pale 

 brown; scales thin, ovate, acute, closely imbricated; rachis slightly margined ; 

 stamens 2 ; nut linear-oblong or somewhat club-shaped, short-pointed, grayish 

 and minutely pitted; culms Aliform. 3-angled, <>' - 12' high ; leaves and elon- 

 gated involucre very narrow. — Margins of ponds and streams, Florida to North 

 lina. July -Sept. - Kays l'-2' long. Spikelets 4" -7" long. 



§ 2. CYPERUS rnoiM.u. Style 3-cleJl: nut 3-angled: joints of the rachis 



winged by the adnate decurrent BcaUs, rarely win 

 l. Bpicati. Umbel wimple or compound: Bpikelets few - many-flowered, distinct, 

 iding, forming loose or compact spikes at the summit of the rays: scales rigid, 

 7- ll&erved: joints of the rachis commonly conspicuous/ 1/ winged: stamens 3. 



