The Bruguiera (Rhizophoraceae) Species in the Mangroves of Singapore, Especially on the New Record and the Rediscovery

We reported here the new record of Bruguiera hainesii C. G. Rogers, and the rediscovery of an extinct species, Bruguiera sexangula (Lour.) Poir., in the mangroves of Singapore. To simplify the process of identifying all the five Bruguiera species in Singapore, a colour plate illustrating the calyx structures (across different development stages) and diagnostic features of the five Bruguiera species were provided. A diagnostic key to the five Bruguiera species was also provided, with updated descriptions for the two species. As it was difficult to identify the different Bruguiera species solely on the basis of vegetative structures, we therefore suggest that the series or numbers of colleters (finger-like glandular structures inside the base of stipules) could be an aid for identifying members of Rhizophoraceae especially in the absence of reproductive structures