1 Supplementary Information Title: Molecular identification of natural mangrove hybrids of Rhizophora in Peninsular Malaysia Authors: Wei Lun NG 1 , Hung Tuck CHAN 2 , Alfred E. SZMIDT 1 * 1 Graduate School of Systems Life Sciences, Kyushu University, Fukuoka, Japan 2 International Society for Mangrove Ecosystems (ISME), Okinawa, Japan *Corresponding author: Alfred E. Szmidt Email: aszmiscb@kyushu-u.org Supplementary Information: Page 2-7: Supplementary Fig. S1 Neighbor-Joining trees based on number of differences among haplotypes/alleles of all samples at six nuclear loci: (a) DLDH, (b) FMRrm11, (c) mang-1, (d) PAL1, (e) RPB2, and (f) SBE2. Circles represent haplotypes from R. apiculata × R. stylosa hybrids: Black circles = putative F 1 hybrids. Triangles represent haplotypes from R. mucronata × R. stylosa hybrids: Black triangles = putative F 1 hybrids; grey triangles = putative advanced-stage hybrids. Bootstrap values (after 1000 replicates) are shown at the branch nodes. Page 8: Supplementary Fig. S2 Alignment of the five cpDNA atpB-rbcL intergenic spacer haplotypes observed in the Rhizophora samples. Dots represent identical sites among sequences; hyphens represent deletion. Variable sites among haplotypes are marked with grey shading.