Flora of Romonum Island — Stone 
111 
Fig. 5. Ivory-nut palms ( Metroxylon amicarum) in the west freshwater swamp. Below, left and right, 
dumps of Cyrtosperma chamissonis. Center, Trichoon karka. 
or retreating from them in accordance with such 
factors as rainfall, changes in tides, or man’s 
activities. 
Tree species: Banin gtonia racemosa, Metrox- 
ylon amicarum . Some other trees are also to be 
found in or at the edges of these swamps; they 
exhibit varying degrees of tolerance to standing 
water. Some, for example Glochidion, may en- 
dure the swamp conditions for an appreciable 
time, but succumb eventually, and meanwhile 
present an unhealthy appearance, the leaves be- 
ing few and often chlorotic. Typically, only the 
Barringtonia and Metroxylon are bona fide 
members of such swamp communities, and even 
the Metroxylon is not restricted to such com- 
munities but, for example, as on Tol Island, 
may be found in moist rocky valleys. 
Other characteristic species: the aroids, either 
actively cultivated or persisting from former 
cultivation ( Colocasia , Cyrtosperma , and, rarely, 
Alocasia ) ; the tall reed Trichoon karka; Lud - 
wigia octovalvis ; Polygonum minus; Cyperus 
odor at us ; other Cyperaceae on occasion (Cy- 
perus sp., Eleocharis geniculata, Scleria ) ; the 
fern Cyclosorus goggilodus ; the aquatic Blyxa 
octandra. 
Marginal species: Hibiscus tiliaceus, Aero sti- 
ck um aureum. 
Sandy Beach Formation 
(Cocos and Artocarpus must be included 
also.) 
Tree species: (1) Canopy trees — Hernandia 
sonora, Calophyllum inophyllum (scarce on 
Romonum), Barringtonia asiatica, Thespesia 
populnea , Pandanus (rarely). (2) Understory 
or smaller trees, or large shrubs — Scaevola tac- 
cada, Guettarda speciosa, Premna integrifolia, 
