172 MERRILL. 



about 600 in ; Iwahig, in bed of mountain stream, altitude about 300 m, Merrill 

 758, February, 1903, specimen very young. 



This species is probably most closely allied to Cladium riparium Benth., of 

 Australia, and to the var. crassum (Thwaites) Clarke of India and Ceylon; it is, 

 apparently, distinct from both forms. Among the Philippine species it is prob- 

 ably most closely allied to Cladium distichum Clarke but lacks the numerous 

 imbricated glumes of that species. 



Cladium filiforme sp. nov. § Eucladium. 



Caespitosum, tenerum, circiter 40 cm altum; foliis angustis, planis, 

 elongatis, in sicco plus minus plicatis, margine scabridis; paniculis laxis, 

 angustis, thyrsoideis; spiculis paucis, lanceolatis, brunneis, circiter 5.5 

 mm longis, 1-floris; fructibus nitidis, ovoideis vel ellipticis, albidis, ses- 

 silibus, vix rostratis. 



A caespitose perennial about 40 cm high, slender. Stems terete, about 

 1.5 mm in diameter. Leaves mostly basal, slender, about 20 cm long, 

 1.5 mm wide, scabrid, apparently plane when fresh, more or less folded 

 when dry, the culm leaves two or three, similar to the basal ones. Pani- 

 cles slender, thyrsoid, comparatively few-flowered, narrow, rather lax. 

 Spikelets lanceolate', brown, 5 to 6 mm long, their pedicels slender, 2 to 

 8 mm in length, each group of three or four spikelets subtended by a 

 setaceous, scabrid, leaf-like bract 1 cm long or less. First two glumes 

 empty, lanceolate-ovate, acuminate, about 3 mm long. Third glume in- 

 closing a perfect flower, narrowly oblong, acuminate, 3.5 mm long, thicker 

 than the empty glumes. Stamens three; anthers linear, 2 mm long. 

 Nutlet ovoid or ellipsoid, white and shining, sessile, not beaked, gla- 

 brous; style 5 mm long, divided to the middle into three arms. Fourth 

 glume similar to the third, empty, the fifth smaller and thinner, also 

 empty. 



Palawan, Mount Victoria, Bur. Sci. 717 Foxworihy, March 24, 1906, on rocks 

 at base of a waterfall, altitude about 600 m. 



A species characterized by its slender habit, slender leaves and panicles, some- 

 what resembling Cladium undulatum Thwaites but smaller and with no traces of 

 hypogynous bristles. 



SCIRPUS Linn. 



Scirpus lacustris Linn. Sp. PI. (1753) 48; Clarke in Hook. f. Fl. Brit. Ind. 

 6 (1893) 658. 



Luzon, Province of Cagayan, Buguey, For. Bur. 17290 Curran, March, 1909, 

 a common and conspicuous plant in lagoons back of the town. 



Frequent in fresh water nearly throughout the world, except South America 

 and Malaya. Not previously reported from the Philippines. 



XYRIDACE^. 



XYRIS Linn. 



Xyris anceps Lam. 111. 1 (1791) 132; Hook. f. Fl. Brit. Ind. 6 (1892) 364. 

 Luzon. Province of Isabela, Carig, Bur. 8ci. 8065 Ramos, May, 1909. Seme- 

 RAKA, Merrill J/lhl, June, 1905. 



