IX, c, 3 Merrill: Noteworthy Philippine Plants 263 



Palawa*, Taytay, in open swampy places at sea level, Merrill 9320, May 

 28, 1913. 



A species allied both to Dimeria chloridiforviis K. Schum. & Lauterb., 

 of the Marianne Islands, and to the Indian Dimeria fuscescens Trin., differ- 

 ing from the former in its smaller spikelets and narrower, not ciliate 

 rachises, and from the latter in its prominently ciliate-pilose sheaths and 

 leaves and its prominently ciliate-pilose keels of the empty glumes. 



ISCHAEMUM Linnaeus 



ISCHAEMUM GLAUCESCENS sp. nov. § Euischaemum. 



Species /. aristato affinis, differt planta majoribus, 1 ad 3 m 

 longis, plus minusve glaucescens, racemis usque ad 15 cm longis, 

 spiculis majoribus, 8 mm longis, glumis I spiculae sessilis in I 

 inferiore prominente transverse rugosis, rugis 4 vel 5, elevatis. 



A rather coarse, wiry, perennial grass reaching a height of 

 from 1 to 1.5 m, the stems long-prostrate, scarcely or only 

 slightly branched, reaching a total length of from 2 to 3 m, 

 about 5 mm in diameter, hard, more or less glaucous under the 

 sheaths. Leaves narrowly lanceolate to linear-lanceolate, glab- 

 rous, 15 to 20 cm long, about 1 cm wide, acuminate, base grad- 

 ually narrowed, acute or obtuse, not at all cordate ; sheaths about 

 as long as the internodes, rather loose; ligule truncate, 2 to 3 

 mm long. Racemes two, closely appressed, 12 to 15 cm long, 

 long-exserted, the joints of the rachis about 6 mm long, 3-angled, 

 bearded on the outer angle. Sessile spikelets about 8 mm long, 

 lanceolate; first glume coriaceous, 8 mm long, 2 mm wide, 

 glabrous, somewhat glaucous, acuminate, margins incurved 

 throughout, borders in upper part minutely scabrid, the dorsal 

 part in the lower one-half with 4 or 5 prominent transverse 

 ridges; second glume coriaceous, lanceolate, acuminate, keeled, 

 7 mm long; third glume hyaline, lanceolate, acuminate, 7 mm 

 long; fourth glume similar to the third, a little shorter, cleft 

 to the middle, bearing in the cleft a twisted, geniculate, 12 to 13 

 mm long awn. Anthers 3 mm long. Pedicellate spikelets 

 dimidiate, their pedicels 2.5 mm long, stout, 3-angled, bearded 

 on the outer angle, the first glume lanceolate, 8 mm long, 3 

 mm wide, acute or acuminate, coriaceous, one side rather broadly 

 winged, the wing short ciliate-toothed ; second glume somewhat 

 lanceolate, 6 to 7 mm long, acuminate, the remaining ones 

 somewhat shorter, hyaline. 



Palawan, Lake Manguao, Merrill 9^53, April 23, 1913, gregarious along 

 the more or less swampy grassy borders of the lake in the openings of 

 narrow valleys, with or without streams of water, areas submerged during 

 periods of high water in the lake, altitude about 50 meters. The grass 

 is abundant in suitable habitats, and is utilized by the crocodiles in build- 



