ix, c, 6 Gates: Swamp Vegetation in Hot Springs Areas 513 
Species in the parang association in the swamp area. 
DOMINANT SPECIES. 
Acacia farnesiana (L.) Willd. 
Callicarpa blancoi Rolfe. 
Erythrina indica Lam. 
Ficus pseudopalma Blanco. 
Ficus ulmifolia Lam. 
Ficus spp. 
Gliricidia sepium (Jacq.) Steud. 
Glochidion sp. 
HERBACEOUS 
Abutilon indicum G. Don. 
Achyranth.es aspera Linn. 
Ageratum conyzoides Linn. 
Amaranthus spinosus Linn. 
Barleria prionitis Linn. 
Commelina nudiflora Linn. 
Dactyloctenium aegyptium Willd. 
Eleusine indica (Linn.) Gaertn. 
Heliotropium indicum Linn. 
Hibiscus surratensis Linn. 
RELIC 
Acrostichum aureum Linn. 
Bacopa monniera Wettst. 
Phragmites vulgaris Trin. 
Leea aculeata Blanco. 
Macaranga tanarius Muell.-Arg. 
Phyllanthus reticulatus Poir. 
Pithecolobium dulce Benth. 
Premna odorata Blanco. 
Psidium guajava Linn. 
Semecarpus cuneiformis Blanco. 
Tabernaemontana pandacaqui Poir. 
SECONDARY SPECIES. 
Mimosa pudica Linn. 
Oplismenus undulatif olius Beauv. 
Panicum (E chinochloa) colonum Linn. 
Ricinus communis Linn. 
Scleria scrobiculata Nees. 
Solanum nigrum Linn. 
Sphaeranthus africanus Linn. 
Synedrella nodiflora Gaertn. 
Triumfetta bartramia Linn. 
Urena lobata Linn. 
SPECIES. 
Typha angustifolia javanica Schindl. 
(Rare.) 
VINES AND LIANAS. 
Abrus precatorius Linn. 
Cissus trifolia K. Sch. 
Hewittia sublobata 0. Ktze. 
Ipomoea cairica Sweet. 
Ipomoea obscura Lindl. 
Ipomoea sp. 
Jacquemontia paniculata Hallier f. 
Melothria mucronata Cogn. 
Merremia gemella Hallier f. 
Merremia hastata Hallier f. 
Merremia vitifolia Hallier f. 
Sida javensis Cav. 
Tournefortia sarmentosa Lam. 
THE ERYTIIRINA-BARRINGTONIA ASSOCIATION 
The highest vegetation of the swamp, as such, is an association 
of trees, dominated by Erythrina fusca Lour, and Barringtonia 
luzonensis Rolfe. In this area these trees are found in the Tarlac 
swamp near the entrance of the Casilihan River. While the 
association has been seriously interfered with in this region, it 
appears that normally this association consists of well-spaced 
trees growing in water. Small trees and shrubs may be present 
in openings. Vines and lianas are generally very abundant. 
At the margin, vines are particularly conspicuous. The transi- 
tion from the marsh to the swamp-tree association is abrupt. 
