Three new species of Impatiens (Balsaminaceae) from Myanmar

Abstract

Three new species of Impatiens (Balsaminaceae) from Myanmar are here described: I. decurva Ruchis. & S.B. Janssens, I. hartnolliae Hook. f. ex Ruchis. & Suksathan, and I. oblongata Ruchis. &Van der Niet. The 5-lobed short fusiform fruit of all three species suggests that they are members of subgen. Impatiens sect. Uniflorae Hook. f. & Thomson. For I. decurva and I. oblongata, subgenus membership was corroborated by phylogenetic analyses of a combined dataset of nuclear ITS and plastid atpB-rbcL intergenic spacer DNA sequences. This was not possible for I. hartnolliae, which is only known from a single herbarium specimen.

Impatiens katjae, a New Species of Impatiens (Balsaminaceae) from Central Myanmar

“…The floral morphology of the lateral united petals and dorsal petal indicates that I. decurva is related to I. florulenta Hook. f., as also discussed by Ruchisansakun et al (2018a), rather than I. katjae. Further study, especially phylogenetic analyses, may reveal the relationship between these species.…”

“…Additionally, the leaves of I. decurva are congested toward the stem apex. Both of those species were described with good illustrations and photographs in the original protologue (Ruchisansakun et al, 2018a). The recently collected species is apparently not identical with either; therefore, we describe it here as I. katjae Nob.…”

“…It is located at the crossroads between South Asia, East Asia, and Indochina, with influences from each adjacent region (Middleton et al, 2019). Since Kress et al (2003) recorded 47 species of Impatiens from Myanmar, many new species have been described (Tanaka et al, 2015;Ruchisansakun et al, 2017Ruchisansakun et al, , 2018aYang et al, 2017). A recent revision of Impatiens in Myanmar recognized 65 species (Ruchisansakun et al, 2018b During a survey in the Mandalay Region, central Myanmar, in 2016, the third author collected a very small-flowered Impatiens species.…”

An annotated checklist of Myanmar orchid flora

“…In this regard, it can be estimated that about 150-300 species still remain unexplored and are expected to be discovered in future studies on Myanmar orchid flora. As for conservation, all orchid species are legally protected by national legislation but most orchids are still under various threats for (Aung et al 2017, Jin and Kyaw 2017, Tseng et al 2017, Yang et al 2017, b, Aung and Jin 2018, Ding et al 2018, Liu et al 2018, Li and Ren 2018, Ruchisansakun et al 2018, Ya et al 2019, Yao et al 2018, b, Mu et al 2019.…”

Impatiens chenmoui (Balsaminaceae), a new species from southern Yunnan, China

“…(Katoh and Standley 2013) and concatenated for phylogenetic analysis (Chen et al 2020). Species sampling was based on previous studies (Yu et al 2015;Ruchisansakun et al 2018). All the sequence GenBank accession numbers were listed in Appendix 1.…”