Abstract
A remarkable new Premna species from Myanmar, P. grandipaniculata Y.H.Tan & Bo Li (Lamiaceae), is here described and illustrated. It differs from all known congeneric taxa by having huge complicated panicles which have tertiary branches formed by spike-like thyrses. In Premna, such a spike-like thyrse is found in P. bracteata and P. interrupta, but those species can be easily distinguished from P. grandipaniculata by their habit, indumentum, leaf size and inflorescence structure.
Highlights
Myanmar is an important component of the Indo-Burma biodiversity hot-spot (Conservation International, available at: http://www.biodiversityhotspots.org/xp/ Hotspots/indo_burma/) and its northern region emerges in the Himalaya Centre, one of the globally richest plant diversity centres (Rafiqpoor et al 2005, Brooks et al 2006)
The terminal branches of the inflorescence are spike-like thyrses formed by sessile cymes laxly arranged on the axis
It was confirmed that it represents a remarkable undescribed new species and it is presented here. Both herbarium specimens and living branches of the putative new species and of P. bracteata and P. interrupta were observed under a stereo dissecting microscope (StereoZoom Leica S8 APO, Leica Microsystems 2017) and measured using a ruler and a micrometer
Summary
Myanmar is an important component of the Indo-Burma biodiversity hot-spot (Conservation International, available at: http://www.biodiversityhotspots.org/xp/ Hotspots/indo_burma/) and its northern region emerges in the Himalaya Centre, one of the globally richest plant diversity centres (Rafiqpoor et al 2005, Brooks et al 2006). The Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences, has resulted in the discovery and description of new species (e.g. Aung et al 2017, Liu et al 2017, Tan et al 2017, Yang et al 2017a, b, c).
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