Primulina scutellifolia, a new species of Gesneriaceae from southern Vietnam

Abstract

Primulina scutellifolia is described as a new species from Khanh Hoa Province, southern Central Vietnam. It is distinct in the genus in having scutellate leaves that make it a highly potential ornamental plant. The new species looks like P. annamensis in general shapes, sizes and colours of habit, inflorescence, flower, and leaf but is distinguishable by adaxially glabrous and abaxially strigose leaves with serrate margins, scutellate leaf blade and appressed downwards tomentose petiole, sparsely glandular hairs on apical 1/2 of the gynoecium and trapeziform one-lipped stigma with slightly emarginated apex.

Langbiangia, a new genus of Gesneriaceae endemic to Langbiang Plateau, southern Vietnam and a taxonomic endeavor to achieve key targets of the post-2020 global biodiversity framework

“…(Rafflesiaceae) in Vietnam [ 28 ]. Langbiang Plateau is also known as the prime habitats of numerous vascular plant species and in the recent decade, a wide range of vascular plant taxa have also been described and/or recorded, including 16 ferns [ 29 – 32 ], one Schisandraceae [ 33 ], three Lauraceae [ 33 , 34 ], five orchids [ 35 , 36 ], one bamboo [ 37 ], one Zingiberaceae [ 33 ], one legume [ 38 ], one aroid [ 39 ], one Menispermaceae [ 40 ], one Daphniphyllaceae [ 33 ], four stone oaks [ 41 , 42 ], one Euphorbiaceae [ 43 ], two Rosaceae [ 33 ], two begonias [ 44 ], one Clusiaceae [ 45 ], one Rutaceae [ 33 ], seven camellias [ 46 – 50 ], four Nyssaceae [ 33 , 51 ], one ginseng [ 52 ], one Loranthaceae [ 53 ], two hollies [ 33 ], one Icacinaceae [ 33 ], one Symplocaceae [ 33 ], one Rubiaceae [ 54 ], and five gesneriads [ 55 – 58 ]. However, the rich and unique biological diversity of the Langbiang Plateau has continuously been threatened by growing land demands for agriculture ( Fig 1 ) and residency [ 59 ].…”

“…Likewise, no molecular data was generated for P . scutellifolia to assure its generic placement [ 58 ].…”

“…poilanei , and P . scutellifolia grow on humid fertile soils of the evergreen broad-leaved forest at elevation of 1,450–2,000 m [ 58 , 78 , 92 , 93 , 97 ]. Morphologically, P .…”

“…poilanei , and P . scutellifolia also differ from the typical Primulina by their alternate and spirally arranged phyllotaxy [ 58 , 78 ], while a majority of Primulina are characterized by decussate or whorled leaves ( Fig 4 ). Additionally, the peltate and scutellate leaf bases of P .…”

Oreocharis phuongii (Gesneriaceae), a new species from central Vietnam

“…Most of the approximately 130 species are found in southern and south-western China, with a few species also in northern Vietnam, India, Bhutan, Myanmar, Thailand and Japan (e.g. Pham 2000 ; Vu 2005 , 2018 ; Wei et al 2010 ; Möller et al 2011 , 2016 , 2018 ; Do et al 2017 ; Chen et al 2017 , 2018 ; Yang et al 2019 ; Cai et al 2019 ; Jin et al 2021 ).…”