524 
ROBINSON. 
feriore 2- ad 5-dentatis, dentibus saepissime acutis, dente. terminal! hand 
protracto, breve, obtuso vel srlbacuto; triplinerviis, venis snperioribus 
obscnris lateris snperioris saepius 1, latetis inferioris 2 vel 3, pagina 
utraque cystolithis notatis. 
Luzon, Province of Tayabas, Lucban, Elmer 91J/9 (type. collection) : Province 
of Laguna, Mount Banajao, Bur. Sci. 9777 Robinson. A plant of comparatively 
low elevations, 700 to 800 m on both mountains. In spite of the very manifest 
dissimilarity in general resemblance, this species is ' very closely allied to the 
preceding, the second collection, while certainly to be identified with E. micro- 
phyllum, tending to vary in the direction of E. acrophilum. The difference in 
elevation means less in this instance than might be supposed, for the ravine where 
Bur. Sci. 9777 was obtained contains many species normally found at much higher 
altitudes on the same mountain, even at the summit. 
16. Elatostema oblanceolatum sp. nov. 
Repens, caulibus pilis subrigidis saltern apice adspers'is ; receptaculis 
pistilliferis subsessilibus, parvis; perianthio minuto: foliis oblanceolatis, 
basi utrinque euneatis, margine integris vel uno vel utroque latere 
1-dentatis, triplinerviis. 
Dioecious; pistillate receptacles sessile or subsessile, the outermost 
bracts broadly lanceolate, corniculate, 2.5 mm long, the inner narrower, 
often oblanceolate, the braeteoles still narrower, all conspicuously long- 
ciliate; flowers on short comparatively stout pedicels; perianth-lobes 3, 
usually not exceeding 0.1 mm in length but' in the same receptacle 
sometimes considerably longer, never sufficiently to inclose more than 
the basal third of the ovary; about; 1 mm long. 
Creeping plants with stems 5 to 10 cm long, simple or sparingly 
branched, bearing especially toward the apex rather scattered stiff white, 
hairs ; leaves subsessile, the membranaceous lamina oblanceolate or rarely 
elliptic-oblaneeolate or obovate, mostly 6 to 13 mm long, 2.5 to 4.5 mm 
wide, or some of them smaller, acute on both sides at the base, entire or 
somewhat more frequently with a single tooth on the lower or on each 
side ; terminal tooth rounded, apiculate ; both ' surfaces glabrous and 
provided with rather long but .often not very conspicuous cystoliths, 
often with stiff cilia on the margins; triplineryed, additional veins 
slender, single* or wanting on the upper side, 1 or 2 on the lower. 
Negkos, Canloan Volcano, on steep moss-covered shaded banks of stream, at 
900 m elevation, Merrill 6909. 
17. Elatostema philippinense Elmer Leafl. Philip. Bot. 3 (1910) 888. 
Suberectum vel scandens: ramosum, 20 ad 30 cm longum, caulibus 
apicem versus sparse pubescentibus : receptaculis staminiferis ses- 
silibus, bracteis exterioribus ovatis, acuminatis, corniculatis, 3.5 m m 
longis, ciliatis, interioribus subaequilongis sed multo angustioribus, 
corniculatis ; perianthio 5-partito, corniculato : foliis brevissime petiolatis 
vel sessilibus, membranaceis, oblique ellipticis vel lanceolatis, 3 ad 8 
