330 



(15) ISCHAEMUM Linn. 



Racemes two to many, digitate. Spikelets broad, the pedicellate like 

 the sessile lint frequently unawned, rarely staininate or empty. First 

 empty glume coriaceous or membranous, obtuse, often 2-toothed. Flow- 

 ering glume awned from the apex or from the notch. Mostly low 

 grasses with rather broad leaves. 



Species about 40, tropics of both hemispheres, 7 in the Philippines. 



I. Articulations and pedicels 3-anglod : inflorescence 

 glabrous or slightly filiate or pilose, the hairs white. 

 2. First glume of the sessile spikelct transversely 

 rugose. 



3. First glume nearly flat, with 2 to 4 mar- 

 ginal nodules or low transverse ridges; 



perennial (l)/. arittatum 



3. First glume strongly convex, closely trans- 

 versely ridged; annual (2)7. rugotutn 



2. First glume of the sessile spikelct not trans- 

 versely rugose. 

 3. Spikes two. 



4. Fourth glume of the sessile spikelct 



unawned; a maritime grass (3)/. muiieum 



4. Fourth glume of the sessile spikelct 

 awned. 



5. Culms erect ( l ) /. men-ilia 



5. Culms much elongated, pros- 

 trate ( ." i /. arundinaceum radicana 



3. Spikes five to six (6) /. intermedium 



1. Articulations and pedicels 2-angled ; inflorescence densely 



ferrugiuous-villous (7) I. anguttifolium 



(1) Ischaemum aristatum Linn. Sp. PI. (1853) 104!), var. gibbum (Trin.) 

 Mack, in DC. Mono-- PbAn. 6 (1889) 204; Pilger in Perk. Frag. Fl. Philip. 

 (loon 139. Uohaemum gibbum Trin. in Mem. Acad. St. Petersb. VI. 2 (1833) 

 296; Miq. Fl. hid. Bat. 3 (1859) 498; F.-Vill. Nov. App. (1883) 315. Andro- 

 pogon gibbum Steud. Syn. 1 (1855) 370. 



Luzon, Province of Isabcla. Fcha^iie (I.'!.") Merrill) June, 1902; Province of 

 Nueva Viscaya, Dupax (253 Merrill) May, 1002: Manila (69 MoQregor) October, 

 I904j [Boribner) June, 1902; (Merrill) January, 1906. Cluon (469, (177 

 Merrill) December, February, 1902 03. 



Kticlemic. i. e., the variety, the specie-, India, China, and Malaya. 



(2) Ischaemum rugosum Salisb. tc. (1701) I. /. /. var. distachum (Cav.) 

 /. rugosum var. eegetum (Trin.) Hack, in DC. Monog. l'han. 6 (1889) 208; 

 Pilger in Perk. Frag. Fl. Philip. (1904) L39. Colladoa dietoohya Cav. Icon. 5 

 (1700) 37. /. 460. Ischaemum colladoa K. Br. Prodr. (1810) 20."); Kunth. 

 Knum. 1 (1833) 513; Miq. Fl. tnd. Bat. 3 (1859) 408. Ischaemum segetum 

 Trin. in Mem. Acad. St. IV'tersb. VI. 2 (1833) 204. Andropogon aegetum Steud. 

 Synopsis 1 (1855) 370. Andropogon ramosus Blanco, Fl. Filip. ed. 1 (1837 1 

 37; ed. 2 (1845) 25, ed. 3. 1 (1877) 47. non Forsk. /. oiliore F.-Vill. Nov. App. 

 (1883) 315, non Rets. /. rugosum Vidal, l'han. Cumin.-. Philip. (1885) 158; 

 Rev. I'l. Vase. Filip. ( 1886) 290; Rolfe in Journ. Bot. 23 | 1885) 216. 



Philippines (565 Cuming), Luzon, Province of Bataan, Dinalupijan (1550 

 Merrill) February, 1003: Province of Zambales, Subic (Hollier) December, 1903. 

 Sp.-Fil. Trigo, Tinitrigo, 



India, China, and Malaya. 



(3) Ischaemum muticum Linn. Sp. I'l. (1753) 1040; Miq. Fl. lud. Bat. 3 

 (1850) 496; F.-Vill. Nov. A]. p. (1883) 315; Hook. f. Fl. Brit. hid. 7 (1807) 



