112 A FLORA OF MANILA 
slender. Spikelets red or reddish-brown, spreading, slender, rather laxly 
disposed, 1 to 3 em long, 10- to 25-flowered, the glumes obtuse, oblong- 
elliptic, remote, 2mm long. Nut oblong, 1.3 to 1.5 mm long. 
In open grass lands, San Juan del Monte and other places, fi. all the 
year; throughout the Philippines. Tropics generally. 
10. C. rotundus L. Mutha (Tag.). 
A slender, erect, glabrous perennial 10 to 40 cm high, the rhizomes 
wiry, bearing black, hard, ovoid tubers about 1 cm in diameter. Stems 
usually solitary, 3-angled above. Leaves 5 to 15 cm long, or sometimes 
as long as the stems, 3 mm wide or less. *Umbel simple or compound, 
2 to 6 cm long, the rays long or short, the spikes dense or rather lax, of 
from 3 to 8 spikelets. Spikelets brown, slender, 10 to 25 mm long, 10- 
to 25-flowered, the glumes 2.5 to 3 mm long. 
In gardens, lawns, waste places, etc., very common, fi. all the year; 
throughout the Philippines. In all warm countries. 
11. C. zollingeri Steud. : 
A slender glabrous perennial 10 to 50 cm high, the stems mostly soli- 
tary. Leaves 5 to 20 cm long, 2 mm wide or less. Umbels simple or 
compound, rather lax, of few long and short rays, sometimes reduced to 
one, the spikes rather lax, of from 2 to 6 spikelets. Spikelets brown, 
slender, 1 to 2.5 cm long, 10- to 15-flowered, the glumes about 3 mm 
long, rather distant. Nut 3-angled, 2 mm long. 
In open, dry grass lands, Masambong, fl. July-Sept.; not common in the 
Philippines. Tropical Asia and Africa, through Malaya to Australia. 
12. C. radiatus Vahl. 
A coarse, erect, tufted perennial 0.2 to 1 m high. Leaves one-half to 
two-thirds as long as the stems, 7 mm wide or less, the bracts subtending 
the inflorescence leaf-like. Inflorescence compound, umbellate, brown, the 
rays long or short. Spikes 3 to 6 at the end of each branch, sessile, 
dense, cylindric, 1.5 to 4 cm long, 6 to 8 mm thick. Spikelets 4 to 5 mm 
long, 12- to 18-flowered, the glumes about 1.2 mm long. Nut ovoid, about 
0.9 mm long. © 
In open wet lands and swampy places, common, fi. all the year; through- 
out the Philippines. Widely distributed in the tropics. 
5. MARISCUS Gaertner 
Coarse or slender tufted plants, usually perennials, rarely annuals. 
Leaves mostly basal, sometimes cauline, the bracts leaf-like. Inflores- 
cence of umbelled heads or spikes. Spikelets more or less compressed; 
glumes distichous, the rachilla of the spikelet disarticulating above the 
2 lowest glumes. Nut trigonous; style 3-fid. 
Species about 160 in all warm regions, about 8 in the Philippines. A 
genus very closely allied to Cyperus, differing chiefly in the articulated 
rachillas. 
1. Umbels simple. 
2. Spikes cylindric, dense, about 2 cm long; spikelets usually 2-flowered. 
1. M. cyperinus 
2: “Spikes limevir,, ‘lax. 45.00. Ree Ae lee rs oat 2. M. flabelliformis 
