Sonneratiaceae (concluded). Sonneratiaceae and other mangrove-swamp families, anatomical structure and water relations

The question whether tidal and non-tidal members of a family have a separate wood anatomical structure would be examined best in such genera as embrace both types. The sequel to this examination, whether any such differences are connected with peculiarities in the water relations of the plants, should be examined in the same way. There are, however, few genera that comprise both littoral and inland species. In some of these genera, Excoecaria, Ixora and Dolichandrone, wood anatomical data can be compared but water relations among the species have not been examined nor are comparative data from the nearest relatives available. According to MOLL & JANSSONIUS the mangrove-swamp species possess more vessels per mm² with a larger total area on cross section and the pores are mostly distinctly smaller than in the nearest related inland species. However, data on area JANSSONIUS did not record.