Cyperus. | CYPERACEAE. 463 
margins. Umbel 3—8-rayed, either contracted, appearing like a fascicle 
of 1/2—8/4‘ in length, or more frequently some or most rays lengthened 
out (to 2‘ or more), each with 10--20 spikelets, which are arranged in 
a racemose or subcorymbose manner toward their ends, erect in the con- 
tracted, seeuepeenss patent in the —— ed umbels. Involucral leaves 
3—6, the 2, 3, or more largest ones much exceeding the ent in length. 
Spikelets linear- dace 4-—9" ioae Sate compressed, 12—24-flowered. 
Glumes pale-brown, with lighter colored edges, ovate- ae about 1” 
long, thickened at the greenish keel and shortly mucronate, indistinctly 
several - savas about twice as cone as the narrow, and at the base thinly 
Nut 
wing-margined foveoles. Stamens 2. Style deeply bifid, exserted. 
pale- “eel oblique- agin apvains compressed, about 1/2 thé length of 
its glume. — Steudel, 1. — Beklr. |. ¢. p. 478. — C. paniculatus, 
Rottb. (the form with Sb ae — OC. brunneus, Hook. & Arn. in : 
Beech. rs Sw.), and probably also C. caespitosus of the same authors, 1. c. 
8 var. pallidus. — Whole plant pale; the stem thick and short, 8—12’ 
long ; ihe stiff, about 1/2 the length of the stem; umbel contracted; 
involucral leaves short 
Very common on open grassy slopes; the variety on dry lava-fields of E. Maui and 
Hawaii! — Found all round the world in tropical and subtropical countries 
73. C. rotundus, L. — Kunth, 1. c. p. 58. — Rhizome creeping and 
bearing small nut-like tubers. Stems '/2—1‘/2 ft. long, slender, acutely 
trigonous. Leaves considerably oe flaccid, flat, ‘snout 2” broad, 
acute, somewhat scabrous near the apex. Umbel stile, of 4—6 slender 
rays, the longest 1—11'/2‘, each ae in its upper third or fourth 4—9 
ascending spikelets. Invol. leaves 3 or 4, not exceeding the umbel. 
Spikelets sessile, at moderately compressed, nearly 1’ long, 12—35-flow- 
ered, with 1 or 2 empty glumes at the base. Glumes ovate, not mucronate, 
I'/2“ long, iy imbricate, dark brown or reddish except at the greenish 
3-nerved keel. Foveoles of rhachis broadly margined with hyaline wings. 
Stamens 3. Style 3-fid, long-exserted. Nut obovate, trigonous, dotted, 
shorter than its siti. -— Stendel, l. c. p. 32. — Beklr., in Linnaea, 
XXXVI, 283 
A most troublesome weed in gardens, where it was first observed about the year 1850. 
=>. This wih diffused over the tropical and subtropical regions of the world. In 
America it extends as far north as Vir The tubers of the rhizome have a pungent 
taste somewhat resembling that of Valeri 
C. pennatus, Lam. — Kunth, 1. c. p. 80, but not of Boeckeler. — 
oe strong, creeping. Stem rather stout, obtusely trigonous, 1—3 ft. 
high. Leaves onger, stiff, flat, 3—6" broad, very scabrous along the 
mbel ye HERS: globose, 
elosely many-rayed, the rays 21/2 —3) 2‘ long, stiff, n de- 
1 downward, branching from the middle or ean aioe the middle 
