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SS) 
IX, C, 3 Merrill: Noteworthy Philippine Plants 263 
PALAWAN, Taytay, in open swampy places at sea level, Merrill 9320, May 
28, 1913. 
A species allied both to Dimeria chloridiformis 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. § Euwischaemum. 
Species J. 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 4 
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 9458, April 23, 1918, 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- 
