Paraphlomis strictiflora (Lamioideae, Lamiaceae), a new species from Guizhou, China

As the largest genus within Paraphlomideae, the biodiversity of Paraphlomis remains to be explored. Here, P. strictiflora, a new species endemic to Fanjing Mountain in Guizhou Province, southwest China, is described and illustrated. Both our molecular phylogenetic analyses based on three plastid DNA markers (rpl32-trnL, rps16, and trnL-trnF) and nuclear ribosomal internal and external transcribed spacers (ITS and ETS) and morphological comparisons supported the treatment of P. strictiflora as a distinct species within Paraphlomis. Morphologically, P. strictiflora is most similar to P. lanceolata but can be distinguished by its much longer and conspicuously 5-veined calyx with triangular teeth, and white corolla with a straight lower lip.