54 MANGROVE SWAMPS 
cut for half its length into narrow pointed teeth, usually twelve 
to fifteen in number. The petals are slightly shorter than the 
calyx-lobes and equal to them in number, two-lobed at the apex 
and with two to four bristles at the point of each lobe, hairy 
at the base, otherwise smooth or nearly so. Opposite each 
petal are two stamens, which are shorter than the petals. Each 
alternate filament is short. The fruit is small; it is found in 
the bottom of the calyx tube and contains a single seed which 
germinates in situ, forming a cylindrical root 30 to 60 centi- 
meters in length. Brugwiera gymnorrhiza Lam. is a synonym 
of B. conjugata (Linn.) Merr. 
BRUGUIERA SEXANGULA (Lour.) Poir. (Plates XIX, XX). PoToTAN. 
Local names: Pototan or pututan (Tayabas, Zamboanga, Mindoro, Mas- 
bate, Misamis, Cotabato, and Palawan); tagdsa (Bataan) ; busdin, busding, 
etc. (Mindoro, Tayabas, Lanao, and Zamboanga); sagdsa (Cagayan) ; 
dlai (Palawan); lagdsak (Palaui); bakduan (Manila); sagasak (Palaui 
Island); langari (Basilan); pototan-babde (Palauan and Bataan); ba- 
kduan-lalaki (Bataan); kalabayuian (Bataan); balinsardyan (Tayabas). 
The leaves of Bruguiera sexangula are pointed at the tip, and 
wedge-shaped at the base; the upper surface is shining, the 
nerves faint; the lower surface is reddish-brown when dry, the 
veins are very faint or obsolete, but the midrib is prominent. 
The flowers are yellow, sometimes tinged with orange, and occur 
singly in the axils of the leaves. They are usually 3 to 4 centi- 
meters in length and when fully opened about 2.5 centimeters in 
breadth. The calyx is similar to that of Bruguwiera conjugata, 
but the lobes are usually only ten in number. The petals are 
about half the length of the calyx-lobes and deeply divided into 
two parts, with a stout bristle in the angle between the two 
narrow lobes, and sometimes with two bristles at the end of 
each lobe. The edges are densely clothed with stout white 
hairs. The fruit is similar to that of Bruguiera conjugata, 
except that the germinating root is shorter. 
Bruguiera eriopetala W. & A. is a synonym of Bruguiera 
sexangula (Lour.) Poir. 
BRUGUIERA CYLINDRICA (Linn.) Blume (Plates XXI, XXII). PoTéTan- 
LALAKI. 
Local names: Bakduan (Mindoro) ; bis (Cotabato) ; busdin (Mindoro) ; 
hingali (Negros); langarai (Cotabato); magtongog (Masbate); pototan 
and pototan-lalaki (Tayabas and Mindoro); targdl-babde (Mindoro) ; ka- 
lapinai (Union); buis (Moro); targdlan (Mindoro); biuis (Pangasinan) ; 
magtangud (Masbate); biwas (Bataan). 
Bruguiera cylindrica has flowers intermediate in size between 
those of Bruguiera conjugata and Bruguiera parviflora. The 
tree is usually of low growth, otherwise it is much like Bruguiera 
