Taxonomic notes on Trigonostemon (Euphorbiaceae) in the Philippines

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.