Abstract
Pogostemonhainanensis, a new species of Lamiaceae from Hainan Island, China, is described. The phylogenetic position of the new species within Pogostemon was investigated based on analyses of the nuclear ribosomal internal transcribed spacer (nrITS) and five plastid markers (viz. matK, psbA-trnH, rbcL, rsp16, trnL-F). The results show that P.hainanensis is supported to be a member of subgenus Pogostemon and is sister to P.parviflorus, a species widely distributed from Eastern Himalaya, through the Indo-China peninsula to China. Morphologically, the new species can be distinguished from all the other taxa of subgenus Pogostemon in having long petioles usually 4.5‒11.5 cm in length, and the calyx teeth 2/3 to subequal as long as the calyx tube. The new species differs from P.parviflorus further by its obviously double serrate leaf margin, spikes of inflorescence usually 2.5–8.0 cm long, calyx 4‒5 mm long and corolla 6–7 mm long.
Highlights
Pogostemon Desf. is the largest genus in Pogostemoneae, Lamioideae, Lamiaceae (Zhao et al 2021), and it is circumscribed recently in its broad sense that includes Pogostemon s.s. and Dysophylla Bl. (Yao et al 2016; Zhao et al 2021)
The genus can be distinguished from other Pogostemoneae members by the presence of exserted stamens bearing moniliform hairs (Bhatti and Ingrouille 1997; Yao et al 2015)
The former subgenus is characterized as perennial subshrubs, shrubs or rarely perennial herbs, spikes of inflorescence with more than two lateral branches, bracts and bracteoles large and usually broad-ovate, ovate or rarely lanceolate; while the latter subgenus is characterized as annual herbs or rarely perennial herbs or subshrubs, inflorescence a single terminal spike or rarely with two lateral branches, bracts and bracteoles small and narrow, and usually lanceolate, linear or filiform (Yao et al 2016)
Summary
Pogostemon Desf. is the largest genus in Pogostemoneae, Lamioideae, Lamiaceae (Zhao et al 2021), and it is circumscribed recently in its broad sense that includes Pogostemon s.s. and Dysophylla Bl. (Yao et al 2016; Zhao et al 2021). Is the largest genus in Pogostemoneae, Lamioideae, Lamiaceae (Zhao et al 2021), and it is circumscribed recently in its broad sense that includes Pogostemon s.s. and Dysophylla Bl. The genus can be distinguished from other Pogostemoneae members by the presence of exserted stamens bearing moniliform hairs (Bhatti and Ingrouille 1997; Yao et al 2015). Ge (Yao et al 2016) The former subgenus is characterized as perennial subshrubs, shrubs or rarely perennial herbs, spikes of inflorescence with more than two lateral branches, bracts and bracteoles large and usually broad-ovate, ovate or rarely lanceolate; while the latter subgenus is characterized as annual herbs or rarely perennial herbs or subshrubs, inflorescence a single terminal spike or rarely with two lateral branches, bracts and bracteoles small and narrow, and usually lanceolate, linear or filiform (Yao et al 2016)
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