118 ^ A FLORA OP MANILA 



In open fresh water swamps, along streams etc., fl. May-Nov.; widely 

 distributed in the Philippines. India to Malaya. 



'2. S. articulatus L. 



A densely tufted plant 20 to 60 cm high, the stems rather spongy, 

 terete, leafless, when dry often transversely septate. Spikelets ovoid to 

 oblong, 1 cm long or less, 7 to 30 in a dense, globose, lateral head near the 

 base of the stems. Glumes oVate, about 4 mm long. Nuts 3-angled, 

 black and shining, obovoid, about 2 mm long. ' Hypogynous bristles none. 



In open wet places, fl. Oct.-Apr.; widely distributed in the Philippines. 

 Tropical Asia, Africa, and Australia. 



8. S. mucronatuB L. 



A tufted rather coarse plant, the stems 3-angled, 40 to 80 cm high, 

 leafless or nearly so, produced beyond the inflorescence 2 to 9 cm, sharp, 

 the sheaths basal. Spikelets in a single, lateral, dense head, ovoid to 

 oblong, 6 to 15 mm long, B to 20 in each head. Glumes numerous, ovate,, 

 acute, about 4 mm long. Nut obovoid, somewhat compressed^ about 2 mm 

 long, smooth and shining; style' 3-fid. Hypogynous bristles 6 or 6, re- 

 trorsely scabrous. 



In open wet places, fl. all the year; widely distributed in the Philippines! 

 Europe to Madagascar, Asia, Malaya, and Australia. 



4. 8. suplnus L. 



A slender tufted plant 10 to 30 cm high, the leaves all basal, few, 



1 cm long or less or reduced to sheaths. Stems ter«te, produced 3 to 10 

 cm above the inflorescence. Spikelets 3 to 7 in a single lateral head, 

 ovoid to oblong, 4 to 7 mm long. Glumes numerous, ovate, acuminate, 



2 to 2.6 mm long. Nuts brown or black, 1.2 mm long, shining, slightly 

 transversely rugose, 3-angled and somewhat compressed. Hypogynous 

 bristles none. 



In old rice-paddies and open wet places, Caloocan, fl. Oct.-March; 

 widely distributed in the Philippines. Tropics generally. 



5. 8. erectus Poir. 



A rather slender tufted plant 20 to 60 cm high, the leaves few, short, 

 basal, or wanting, the stems terete, produced beyond the inflorescence 

 2 to 10 cm. Spikelets solitary /or more often 2 to 6 in a lateral head* 

 ovoid to oblong, 1 cm Igng or less. Glumes ovate, concave, about 3.5 mm 

 long. Nut obovoid, black or brown, shining, somewhat compressed, 2 mm 

 long. Hypogynous bristles 5 or 6, about as long as the nut. 



In open grass lands, San Pedro Macati, fl. more or less all the year; 

 widely distributed in the PhUippines. Temperate and tropical regions 

 generally. 



10. FUIRENA Rottboell 



Tufted, the stems bearing leaves or leaf-like bracts even in the upper 

 half. Leaves grass-like, base sheathing. Spikelets clustered. , Glumes im- 

 bricate on all sides, strongly aristate, hairy on the upper one-half. Hypogy- 

 nous bristles 6, often much reduced, or none. Sepals 3, bristle-like. Petals 

 and stamens 3. Style long,, glabrous, slender, 8-cleft. Nut small, ovoid 

 or obovoid, 3-angled, ofteri stalked, smooth or reticulate, (In honor of 

 G. Fuiren, a Danish physician . and botanist.) 



Species about 25 in all warm regions, 2 in the Philippines. 



