324 SPECIES BLANCOANAE 
Illustrative specimen from Obando, Bulacan Province, Luzon, 
October, 1914 (Merrill: Species Blancoanae No. 392). 
Convolvulus repens Vahl; Blanco FI. Filip. (1837) 92; ed. 2 (1845) 68; ed. 
3, 1 (1877) 128, #. 149, non Linn.=!IPOMOEA REPTANS (Linn.) 
Poir. 
This species is common and widely distributed in the Philip- 
pines at low and medium altitudes, growing in open muddy 
places, shallow pools, etc.; is universally known to the Filipinos 
as cancong; and is a commonly used pot herb. The status of 
Convolvulus reptans Linn., on which Ipomoea reptans is based, 
is subject to an interpretation of types, regarding which author- 
ities differ. The specimen in the Linnean herbarium is Mer- 
remia caespitosa Hallier f.—M. hirta (Linn.) Merr.; the first 
reference to a description and figure is to Ballel of Rheede’s 
Hortus Malabaricus which is Ipomoea reptans as here inter- 
preted. For a discussion of the question see Merrill in Philip. 
Journ. Sci. 7 (1912) Bot. 244, 245. 
Illustrative specimen from Manila, Luzon, November, 1914 te 
- (Merrill: Species Blancoanae No. 427). 
MERREMIA Dennstaedt 
Convolvulus reniformis Roxb.; Blanco Fl. Filip. (1837) 91; ed. 2 (1845) 
67; ed. 3, 1 (1877) 126=MERREMIA EMARGINATA (Burm. f.) 
Hallier f. 
Blanco correctly interpreted Roxburgh’s species, but Burman’s 
specific name is the oldest unless Convolvulus gangeticus Linn. 
should prove to be identical with this species. The species has 
all the appearance of being an introduced one in the Philippines, 
as it occurs only in the settled areas. 
Illustrative specimen from Lamao, Bataan Province, Luzon, 
November, 1913 (Merrill: Species Blancoanae No. 357). 
Ipomoea hepaticifolia Blanco Fl. Filip. ed. 2 (1845) 72; ed. 8, 1 (1877) 134, 
non Linn.=MERREMIA HIRTA (Linn.) Merr. in Philip. Journ. Sci. 
7 (1912) Bot. 244 (M. caespitosa Hallier f.). a 
There is no doubt as to the correctness of the identification 
of Blanco’s Ipomoea hepaticifolia, and it appears to be a form ee 
of Merremia caespitosa Hallier f., for which I have taken up 
the Linnean name Merremia hirta. The question of the proper 
specific name for the species is somewhat obscure, and the 
matter is discussed by me in making the above transfer to Mer- 
remia. Blanco’s specimens were from Parafiaque, a town at - 
sea level a few kilometers south of Manila. The species, pres- __ 
enting considerable variation, is oe siete ihnibedis in the: wees 3 
