Ceratophyllum demersum L.

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CERATOPHYLLACEAE
CERATOPHYLLUM Linnaeus
Ceratophyllum submersum Llanos Frag*. PI. Filip. (1851) 105 (Cerato-
phillum) ; F.-Vill. & Naves in Blanco FI. Filip, ed. 3, 41 (1880.) 81,
non ? Linn.=CERATOPHYLLUM DEMERSUM linn.
From the material available I am inclined to i*efer the Philip-
pine form to CeratophyUmm demersum Linn. The species is
common in shallow lakes and in slow streams in the Philippines.
' Illustrative specimen, from Pateros, Rizal Province, Luzon,
January, 1915 (Merrill: Species BUmcoanae No. 785).