GRAMINEAE 89 



6. D. pedicMlaris (Trin.) Prain. 



A slender, erect, tufted annual 16 to 30 cm high. Leaves linear-lan- 

 ceolate, acuminate, ascending, 1.5 to 6 cm long, about 2 mm wide. Spikes 

 alternate, ascending or spreading, somewhat scattered, usually 3, some- 

 times only 2, 2.5 to 5 cm long, slender, grayish. Spikelets 1.5 mm long, 

 in pairs or in groups of threes, in each group one subsessile, the others 

 . with slender pedicels as long as or longer than the spikelets. 



In open, rather dry grass lands, Masambong, San Juan del Monte, etc., 

 not common, fl. Aug.-Nov.;- known from but three of four localities in Luzon. 

 India. 



22. ISACHNE R. Brown 



Annual or perennial slender grasses. Leaves lanceolate or narrowly 

 lanceolate, flat. Spikelets small or minute, in small, usually open panicles, 

 subglobose or obovoid, 2-flowered. Glumes 4, the first and second thin, 

 subequal, fmpty, the third and fourth somewhat thickened, paleate, each 

 enclosing a usually perfect flower. Grain free within the hardened glume 

 and palea. (Greek "equal" and "glumes,") 



Species about 35, tropical and subtropical, about 9 in the Philippines, 

 one in our area. 



1. i. miliacea Roth. (/. minutula Kunth). 



A very .slender, glabrous or somewhat pubescent grass, the stems branched 

 below, usually prostrate and rooting at the nodes, the flowering stems 10 

 ,to 20 cm high. Leaves lanceolate, acuminate, 1.5 to 4 cm long, 3 to 5 mm 

 wide. Panicles exserted, usually ovate, lax or somewhat contracted, 2 to 

 4 cm long. Spikelets pale-green, rarely purplish, 1.5 mm long, their 

 pedicels slender. 



In open wet lands, especially in rice-paddies, etc., fl. more or less all 

 the year; widely distributed in the Philippines. India to China, Malaya, 

 and Polynesia. 



23. PANICUM Linnaeus 



Annual or perennial, fine or .coarse grasses, of various habits. Leaves 

 in our species flat, acute or acuminate, linear to lanceolate. Spikelets 

 small, 1- or Z'fflowered, terete or dorsally or laterally compressed, awnless, 

 or in § Echinoehloa awned. Glumes 4, the first and second empty the first 

 much smaller than the others, second and third sube'qual 3- to many- 

 nerved, oblong, ovate, or lanceolate; third paleate or not, enclosing a 

 staminate flower or empty, the fourth paleate, enclosing a perfect flower, 

 hardened in fruit, glabrous, usually shining. Stamens 3. Grain free 

 within the fourth glume and the palea. (Ancient Latin name for the 

 Italian millet.) 



A very large genus, found in all tropical and temperate countries, about 

 35 species in the Philippines. 



1, Spikelets terete or dorsally compressed; inflorescence various, 

 2. Spikelets 1- to 4-seriate, close-set on the under side of the rachis of 

 the spike, the spikes alternately arratiged. 

 3. Glumes smooth, awnless. 



.4. Spikes shorter than the internodes 1. P.flavidum 



i. Spikes longer than the internodes. 

 5. Tip of spikes extended beyond the upper spikelets as eC setiform 



bristle; spikes very numerous .^ 2. P. punctatum 



5. Tip of spikes hot produced; spikes 2 to 4 3. P.diataohyum 



