A new species of Eranthemum L. (Acanthaceae) from Thailand and Laos

During preparation of a revision of the genus Eranthemum (Acanthaceae), it became evident that nine specimens from eastern and south-eastern floristic regions of Thailand and southern Laos, represent a new species, that is herein described, illustrated and given the name, E. decumbens. The new species has affinities to E. strictum and E. roseum. A key to the species occurring in Thailand is provided, together with ecological data, distribution map and conservation status.