Shorea guiso is a Philippine native dipterocarp species, it is also known as Guijo locally.
A large tree which grows around 50 to 60 meters tall in the wild, guijo has a large trunk ideal for timber or papermaking Its leaves are simple with entire margins arranged in an alternating phyllotaxy, the leaves are ovate to oblong in its shape. Flowers 5-merous with a superior ovary, the petals are much longer than the sepals, develops into a winged fruit with 3 long wings and 2 short wings. Guijo can be found from 30-600masl, in primary forests growing on red soils, and prefers drier inland soils or on ridges. Guijo trees found in Rizal were recorded blooming in June. Guijo can be planted as windbreaks and to control soil erosion. The wood is used for doors, windows, furniture, and general construction where durability is needed. Dipterocarp seeds are recalcitrant and easily lose viability when dried or stored long. After cutting the wings, the seeds should be planted in a potting medium as soon as possible.
