Narra
Pterocarpus indicus Willd.
Pterocarpus indicus Willd.
The Philippine National Tree, our Narra (Pterocarpus indicus), is classified as Vulnerable which by definition means it is not critically endangered nor endangered but is under threat from adverse factors throughout its range and is likely to be moved to the Endangered category in the future, as per the 2017 DENR Administrative Order. However, the IUCN Red List of Threatened Species 2018 classifies P. indicus as Endangered. The threats to its declining population trend include residential and commercial development, illegal logging, and overexploitation for wood harvesting.
Signaling the end of the school year, it usually blooms from February to May as seen in the main campus. This valuable timber species, being a member of the Fabaceae family, is a nitrogen-fixing tree and has been recommended for use in agroforestry systems and as a shade tree for other crops.
Narra trees have been planted in the year1975 during a fanfare tree planting activity of then PCC President, Dr. Isabelo Crisostomo. This activity still creates nostalgia with some alumni and retired faculty who witnessed the tree planting because it was ceremoniously played with songs using bamboo instruments by the famous Banda Kawayan of PCC Laboratory High students as its band members and musical conductor, Prof. Siegfred Calabig.
The trees rooted well and grew amazingly handsome sharing a breezy shade along the main campus catwalk, now called as Mabini Road. These trees stood gracefully as their canopy spans along the catwalk since the 1980's covering the floor like a magic carpet with their yellow and fragrant blooms, and welcoming everyone that enters our Sintang Paaralan to walk with pride.
Distribution of Pterocarpus indicus Willd in the Polytechnic University of the Philippines (Map created by J. Diongco).
Natural distribution of Pterocarpus indicus Willd in the Philippines (Map created by R.M. Figueroa, A. Dagami and G. Sevilla).
Botanical Description of Pterocarpus indicus Willd.
This tree usually grows up to 33 m in height and 2 m in diameter with trunks usually buttressed with about 7 m diameter at the base. The leaves are compound-pinnae with its leaflets rather large, 7 x 3.5 to 11 x 55 cm and ovate to elliptic in shape with an acuminate tip. Its flat, winged, and disc-shaped fruit takes four months to mature with a central woody-corky bulge containing several seeds usually dispersed by wind.