Impatiens tanintharyiensis (Balsaminaceae), a new species from Southern Myanmar

Abstract

Impatiens tanintharyiensis Ruchisansakun, Suksathan & Saw-Lwin from the Tanintharyi region of Southern Myanmar is described and illustrated as a new species. The presence of connate lateral united petals and a four-locular ovary, as well as results of molecular phylogenetic analyses of nuclear ITS and plastid atpB-rbcL spacer DNA sequences, suggest that the new species is a member of Impatiens section Semeiocardium (Zoll.) S.X. Yu & Wei Wang. The new species is morphologically most similar to I. spectabilis Triboun & Suksathan, but can be distinguished by its asymmetric flowers, saccate-bucciniform lower sepal, and shorter, slightly incurved spur. Floral traits, including the presence of a large floral chamber with a wide entrance, are consistent with the bee-pollination syndrome in Impatiens. Since I. tanintharyiensis is only known from two small populations, its conservation status is assessed as Endangered.

Three new species of Impatiens (Balsaminaceae) from Myanmar

“…735 (L), MF979086, atpB-rbcL: MF979083), and I. florulenta (S. Ruchisansakun & Makino BG Exped. 736 (L), ITS: MF979087, atpB-rbcL: MF979084) were added to the dataset of Ruchisansakun et al (2017). DNA extraction and PCR amplification were conducted as in Janssens et al (2006).…”

“…Sequences were added to the matrix and manually aligned. Bayesian phylogenetic analyses were conducted in accordance with the protocols provided in Ruchisansakun et al (2017). Bayesian analysis of the combined dataset was run for 10,000,000 generations, starting from different random trees and sampled every 500 generations.…”

“…Myanmar is the largest country in continental Southeast Asia and recent explorations have revealed a relatively rich biodiversity (Kress et al 2003). Currently 50 Impatiens species are known from the country (Hooker 1905, Toppin 1920, Comber 1934, Grey-Wilson 1989, Kress et al 2003, Tanaka et al 2015, Ruchisansakun et al 2017, Yang et al 2017. As part of an ongoing project to revise the Balsaminaceae of Myanmar, a field expedition in the country conducted between July and December 2015 as well as analyses of herbarium specimens and relevant literature was conducted.…”

New contributions to the flora of Myanmar Ⅰ

“…However, these studies greatly underestimated biodiversity of Myanmar. More recently, many new species (Murata et al., 2010, Ormerod and Wood, 2010, Tanaka et al., 2010a, Tanaka et al., 2010b, Tanaka et al., 2010c, Tanaka et al., 2011, Tanaka et al., 2015b, Tanaka et al., 2016, Yukawa et al., 2010, Kress et al., 2010, Tanaka and Hayami, 2011, Schaefer et al., 2012, Gowda et al., 2012, Tong and Xia, 2014, Peng et al., 2014, Pradheep et al., 2014, Tan et al., 2015, Tan et al., 2017, Tan et al., 2018, Tanaka and Peng, 2016, Sangnark et al., 2016, Cho et al., 2016a, Phutthai and Hughes, 2017, Liu et al., 2017, Liu et al., 2018, Aung et al., 2017, Ruchisansakun et al., 2017, Zhou et al., 2017, Zhou et al., 2018, Yang et al., 2017a, Yang et al., 2017b, Yang et al., 2017c, Yang et al., 2018a, Yang et al., 2018b, Aung and Jin, 2018, Ding et al., 2018) and newly recorded species (Tanaka et al., 2006a, Tanaka et al., 2007, Tanaka et al., 2018, Ito et al., 2009, Ito et al., 2014, Nemoto et al., 2010, Kurzweil et al., 2010, Rodda and Simonsson, 2011, Kurzweil and Lwin, 2012a, Kurzweil and Lwin, 2012b, Kurzweil and Lwin, 2015, Ormerod, 2012, Nemoto and Murata, 2013, Wang and Xia, 2013, Paszko, 2014, Watthana et al., 2015, Aung et al., 2015a, Aung et al., 2015b, Mood et al., 2016, Ibaragi et al., 2017, Kang et al., 2017, Kang et al., 2018) have been recorded in Myanmar.…”

Impatiens jenjittikuliae (Balsaminaceae), a new species from Thailand

“…Balsaminaceae consists of Hydrocera Blume ex Wight & Arnott (1834: 140) with only a single species, H.triflora (L.) Wight & Arnott (1834: 140), and Impatiens L. (1753: 937), comprising over 1,000 species (Ruchisansakun et al 2018). In Southeast Asia, many new Impatiens species were recently described (Souvannakhoummane and Suksathan 2015; Ruchisansakun et al 2017; Ruchisansakun et al 2018; Suksathan and Triboun 2009).…”