58 SPECIES BLANCOANAE 
ALISMACEAE 
SAGITTARIA Linnaeus 
Alisma sagittifolium Llanos Frag. Pl. Filip. (1851) 69 (sagitifolium) ; 
F.-Vill. & Naves in Blanco Fl. Filip. ed. 3, 4* (1880) 51, non Willd.= 
SAGITTARIA SAGITTIFOLIA Linn. 
Llanos’s specimens were from Calumpit, Bulacan Province, 
Luzon. His description is very imperfect, but certainly applies 
to Sagittaria sagittifolia Linn.; certainly not to Limnophyton 
obtusifolium Mig., where it was reduced by Naves. Miquel’s 
species does not occur in the Malayan region. Sagittaria sagit- 
tifolia Linn. is widely distributed in the Philippines, but is of 
very local occurrence. 
Illustrative specimen from Palapag, Samar, March 10, 1916, 
there known as gauay-gauay (Merrill: Species Blancoanae No. 
982). 
HY DROCHARITACEAE > 
HYDRILLA L. C. Richard 
Udora verticillata Spreng.; Llanos Frag. Pl. Filip. (1851) 101; F.-Villar & 
Naves in Blanco FI. Filip. ed. 3, 4? (1880) 73=HYDRILLA VERTI- 
CILLATA (Roxb.) Royle. 
This fresh water aquatic plant is common and widely distrib- 
uted in the Philippines, growing in slow streams. Sprengel’s 
species was correctly interpreted by Llanos. 
Illustrative specimen from Calumpit, Bulacan Province, Luzon, 
January, 1915 (Merrill: Species Blancoanae No. 666). 
VALLISNERIA Micheli 
Vallisneria spiralis Blanco Fl. Filip. (1887) 781; ed. 2 (1845) 538; ed. 3, 
3 (1879) 187, non ? Linn.=VALLISNERIA SIGART EA Graebn. | in 
Engl. Bot. Jahrb. 49 (1912) 68. 
_ Although the Philippine form has recently been described by 
Graebner as a distinct species, Vallisneria gigantea, I am by 
no means convinced that it is specifically distinct from V. spiralis _ 
Linn. It is found in shallow ponds and slow streams through- 
out the Philippines at low altitudes and is exceedingly variable, - 
its size depending largely, if not entirely, on the depth of the 
water in which it grows. The native name cited by Blanco, — 
cintascintasan is from the Spanish cintas=ribbon, and merely 
means ribbon-like. 
Illustrative specimen from Calumpit, Bulacan Province, Luzon, 
January, 1915 (Merrill: Species Blancoanae No. 667): ; 
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