76 A FLORA OP MANILA 



1. K cylindrica (L.) Beauy., var. koenigli (Retz.) Benth. Cogon (Tag.). 



An erect grass 30 to 80 cm high, the stems solid, rather slender, the 

 nodfes glabrous or bearded. Leaves flat, linear-lanceolate, acuminate, erect, 

 20 to 50. cm long, 5 to 9 mm wide. Panicles exserted, dense, subcylindric, 

 spike-li^e, white, 10 to 20 cm long, 5 to 15 cm in diameter, silvery-silky. 

 Callus hairs copious, about twice as long as the glumes. Spikelets 3 to 4. 

 mm long. 



In open, rather dry lands, common, fl. at intervals throughout the year; 

 widely distributed in the Philippines. All warm countries. 



5. POGOlMATHERUM Beauvois 



Slender, tufted, erect, annual or perennial grasses with capillary peduncles 

 and small, erect leaves. Inflorescence spicate, solitary. Spikelets 1- or 

 2-flowered, in pairs, usually a sessile perfect one, and a pedicelled female 

 one, densely crowded on the slender, fragile rachis of the slender spike, the 

 slender awns often interlaced. Glumes 4, thin, the first oblong, truncate 

 or rounded, long-ciliate, the second as long as the first, acute or 2-toothed, 

 awned, the fourth narrow, 2-fid, long-awned. Grain oblong, free. (Greek 

 "beard" and "awn" in allusion to the inflorescence.) 



A genus of 2 or 3 closely allied species, India to Japan southward to 

 MaJaya, 1 in the Philippines. 



1. P. paniceum (Lam.) Hack. (P. saccharoidev/M Beauv.). 



A slenderj densely tufted, branched, erect grass 15 to 40 cm high. 

 Leaves 3 to 8 cm long, 3 mm wide or less. Spikes brownish, slender, 2 to 

 4 cm long, the awns very slender, 1.5 to 2 cm long. 



On ledges and banks along streams, and in ravines, Masambong, Guada- 

 lupe, etc., fl. at intervals throughout the year; common and widely distri- 

 buted in the Philippines. India to China and Japan, southward to Malaya. 



6. POLYTRIAS Hackel 



A low> slender., prostrate grass with ascending flowering branches, the 

 spikes terminal, brown, hairy, solitary, the rachis jointed, each j6int bearing 

 two sessile spikelets and a pedicellate one, all 1-flowered. First and second 

 glumes equal, hairy, pointed, the third lacking, the fourth hyaline, long- 

 awned. Palea minute, subobsolete. (Greek "many" and "three," in allu- 

 sion to the joints of the rachis each bearing three spikelets.) 



A monotypic genus, native of Java, also found in Singapore (in- 

 troduced?), and introduced in the West Indies. 



l.tP. DiVEBSiFLORA (Steud.) Nash. (P. praemoraa Hack.)!]] 



A slender annual grass, the stems usually decumbent, branched below,.the 

 flowering branches erect or ascending, 20 to 40 cm long. Leaves linear- 

 lanceolate, 2.5 to 6 cm long, 2 to 4 mm wide. Spikes solitary, erect, brown, 

 hairy, 4 to 7 cm long. Spikelets hairy, about 4 mm long, the. awns about 

 1 cm long. 



In open grass lands and waste places, fl. Oct.-Feb.; not copimon in the 

 Philippines outside of the immediate vicinity of Manila. Introduced from 

 Singapore or Java. Java, Singapore, and the West Indies (introduced) . 



7. ARTHRAXON Beauvois 



Slender, annual or perennial, usually branched grasses, with rather 

 short, lanceolate to broadly lanceolate,, often cordate leaves. Inflorescence 



