Pogonatherum GRAMINEAE Arthraxon 



subtropical Asia and Australia; 2 in China. (Greek: pogon, beard, and antheros, awn 

 or stiff bristle, alluding to the bearded and awned racemes. 



Key to the Species 



Sessile spikelets 2.5-3.0 mm. long; the lower floret present; second glume 



a little longer than the first: stamens 2 1 . P. pawiceum 



Sessile spikelets 2 mm. long; the lower floret wanting; second glume 



evidently longer than the first: stamens 1, rarely 2 2. P. crinitum 



1. Pogonatherum paniceum (Lam.) Hack. (L.S.J. 7:235). Culms 30-60 cm. high; fls. 

 IV; fr. V. Tropical Asia and Australia, and southeastern China; locally in Che. 

 Cliffs or grassy roadsides. 



2. Pogonatherum crinitum (Thunb.) Kunth ^#|j|l (Chin Fa Ts'ao; Golden-hair 

 Grass) (A. A. J. 31:131). Culms 15-30cm. high; fls. and fr. V-IX. India to eastern 

 Asia; locally in An., Che., Ki. Fields, roadsides and moist ground. 



77. Ischaemum Linn. H^jjtil (Ya Tsui Ts'ao Shu; Duck-bill-grass Genus) 



Perennials (ours) with usually binate appressed racemes: spikelets binate; one 

 sessile and perfect, usually awned; the other pedicelled, staminate or perfect, but not 

 always fruitful: rachis joints and pedicels triquetrous, confluent at the base into 

 U-shaped structures. About 50 species, in southern Asia and Australia, a few in 

 America and Africa; 8 in China. (Greek: ischo, to press back, and aima, blood; the 

 meaning uncertain.) 



Key to the Species 



First glume of sessile spikelets transversely rugose with 2-4 marginal 



nodules or ridges 1 . I. imbrxcatum 



First glume of sessile spikelets not transversely rugose. 



Sessile spikelets geniculately awned; axterior angles of joints and 



pedicels long-ciliate 2. I. hondae 



Sessile spikelets awnless or shortly awned; exterior angles of joints and 



pedicels serrulate-scabrous 3. /. crassipes 



1. Ischaemum imbricatum (Hack.) Stapf ex Ridley (Rid.F.5:200). Culms 30-120 cm. 

 high; fls. and fr. VI-X. India to eastern Asia and the Philippines; locally in 

 Che., Ki., Ku. Open moist ravines and grassland. Fig. 448. 



2. Ischaemum hondae Matsuda (Bo.Ma.T.27:106). Culms 45-90 cm. high; fls. VII; 

 fr. VIII. Confined to China; locally in An., Che., Ki., Ku. Open valleys or 

 moist grassland. 



3. Ischaemum crassipes (Steud.) Thell. (Mak.F.828). Culms 40-80 cm. high; fls. 

 VII; fr. VIII. Eastern Asia; locally in Che., Ku. Ditches and river banks. 



78. Arthraxon Beauv. H|£|| (Chin Ts'ao Shu; Loyal-grass Genus) 



Perennials or annuals with clasping cordate blades and digitate or fascicled 

 racemes: spikelets binate; one sessile and perfect, usually awned; the other when 

 present neuter or rarely staminate, or often abortive with minute pedicels at base of 

 sessile ones. About 10 species, in tropical and temperate zones; 3 in China. (Greek: 

 arthron, joint, and axon, axis, alluding to the fragile jointed rachis.) 



Key to the Species 

 Perennial: spikelets binate: stamens 3 1. A. lanceolatus 



481 



