Hi Leong
Sorry for this late response. We are currently in France for holiday to visit the family. Summer is beautiful here which make us a little bit away from the internet.
(1).The first photo is Cinnamomum iners of family Lauraceae. This plant is sister to real cinnamon (kayu manis in Malay), the one that is often used as ingredient of cake, soup or hot beverage. Local name for Cinnamomum iners is wild cinnamon and kayu manis hutan in Malay. The tree is originally from our region.
(2). Alstonia sp of family Apocynaceae. The local name is pulai. The tree is one of the most favorable materials for carving due to its color and texture. The wood is light white-yellow and soft. People also call the tree as pagoda tree due to the conical canopy shape. Together with Alstonia angustifolia (Pulai in Malay) which is also Apocynaceae, these trees are known to be one of the gigantic trees in the forest of Malaysia, Indonesia, and Singapore.
(3). Lagerstroemia speciosa of family Lythraceae, which native to Southern Asia. The local name is Bungor.
(4). Casuarina sumatrana of family Casuarinaceae. This tree is among of rare species of its family where native to Sumatra. The local name for this tree is rhu in Malay and eru in Indonesia. The tip area of leaves and branch are well moved by very slight wind due to their fine structure. This circumstance is personalized for some one who can not be trusted "Seperti pucuk eru". During the sightseeing at sea shore of my childhood time (I am Indonesian), we often made a competition within my siblings using the leave of eru. First, the leave was detached according to its compartment. The first person who is able to place back the pieces was the winner.
(5). Tabebuea pentaphylla of family Bignoniaceae. The species is originally from America subtropic and tropic. The tree is deciduous (loses its leaves), which after will bring out its flowers. The flowers are often in enormous amount which gives an attractive view. Nonetheless, I concern about the large number of this non-native tree planted in Malaysia.
Best salutations and enjoy the nature!
As almost neighbors, we should look forward for doing the tree mapping together.