go A 'FLORA OP MANILA 



Var. arlstata (L.) Rendle. 



Differing from the species in having the fourth glume of the perfect 

 spikelet long-awned, the awn usually about 1 cm in length. 



India to China; rare in the Philippines. 



14. ISCHAEMUM Linnaeus 



AnnuaPor perennial, erect or ascending grasses. Spikelets in pairs, 

 one sessile and one pedicelled, in digitate, paired, or fascicl^^, more or 

 less fragile spikes at the ends of the stems. Sessile spikelets with 4 

 glumes, the first oblong, usually thick, awnless, the second as long as 

 the first but narrower, the third hyaline, thin, the fourth hyaline, cleft, 

 awned. Pedicelled spikelets similar tO' the sessile ones, often imperfiect. 

 (Greek "stypic", in allusion to the use of some species to stop the flow 

 of blood.) 



Species about 40, chiefly tropical, about 7 in the Philippines. 



1. Spikes 2, closely appressed to each other; first glume of the sessile spike- 

 lets rugose. 

 2. Perennial; first glume nearly flat, with 2 to 4 marginal nodules pr 



low transverse wrinkles 1. /. aristatum 



2. Annual; first glume strongly convex, closely transversely ridged. 



2, 7. rugosum 

 1. Spikes 4 to 7; first glume of the sessile spikelet not rugose. 



3. /. intermedium 



1. I. aristatum L., var. gibbum (Trin.) Hack. 



An erect, little or not at all branched, loosely tufted or scattered grass 

 40 to 80 cm high. Leaves fiat, 6 to 15 cm long, about 5 mm wide. Spikes 



2, closely appressed, erect, appearing like a single cylindric spike, 4 to 7 

 cm long, the internodes. shorter than the spikelets. Sessile spikelets about 

 7 mm long, the first glume slightly wrinkled, the awn of the fourth glume 

 about 1.5. cm long. 



In open grass lands, fi. all the year; common and widely, distributed in 

 the Philippines. The species in India, China, and Malaya, the variety 

 endemic. 



2. I. rugosum Salisb., var. distachyum (Cav.) Merr. 



A ratHer slender, erect or ascending, annual grass, the stems ultimately 

 much branched, sometimes prostrate below, 30 to 70 cm long, glabrous or 

 sparingly hairy. Leaves 8 to 15 cm long, 6 to 8 mm wide, flat, acuminate. 

 Spikes 2 at the end of each stem, appressed, 4 to 6 cm long. First glume 

 of the sessile spikelet oblong, convex, 5 mm long, prominently transversely 

 wrinkled, the awn of- the fourth glume slender, about 2 cm long. Pedi- 

 celled spikelets about 4 mm long. 



. In open grass lands, Caloocan, San Juan del Mdnte, etc., fl. Nov.^an. ; 

 widely distributed in the Philippines. India to China and Malaya. 



S. i. intermedium Brongn. 



A widely spreading, somewhat branched grass, the ascending stems 1 m 

 long or more. Sheaths rather loose, usually pilose. Leaves flat, up to 

 15 cm in length and 1:5 cm wide. Spikes 5 to 7, digitately crowded at the 

 ends of the stems, 4 to 7 cm long, green. Spikelets lanceolate, about 6 

 mm long, acuminate, the glumes not wrinkled. Awn to the fourth glume 

 about 1 cm long. 



