Abstract
Descriptions of five Trigonostemon species in the Philippines (four endemic) are updated with taxonomic notes based on herbarium collections and field observations. A new species of Trigonostemon is described. All species treated here are illustrated with photos. The formerly uncertain species, T. stenophyllus, is now synonymized with T. filiformis. In addition to T . pentandrus, three more Trigonostemon species are reported to cohabit with ants. A new identification key and an updated identification list of Trigonostemon species in the Philippines are provided.
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