Abstract
Impatiens yinyinkyii M.M.Latt, B.B.Park & Nob.Tanaka and I. horizontalis M.M.Latt, B.B.Park & Nob.Tanaka (Balsaminaceae) are described and illustrated. Those new species were discovered in Htamanthi Wildlife Sanctuary, northwestern Myanmar. Description, photographic data as well as the comparative characters with their similar species are provided. Impatiens yinyinkyii is similar to I. masonii Hook.f., but differs in having three dark purple blotches in center of flower, specifically at base of dorsal and upper petals of united petals. Impatiens horizontalis resembles I. stenantha Hook.f., I. prostrata Hook. f., I. repens Moon, I. procumbens Franch and I. reptans Hook. f. in having larger, glabrous and elliptic to lanceolate leaves, serrate margin with antrorse bristles, deeply bucciniform lower sepal, twisted spur with abruptly capitate tip, linear ovary, spheroid seed and finally uncommon conspicuous stout stem which is horizontally creeping.
References
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<p>Yu, S., Janssens, S.B., Zhu, X.-Y., Lidén, M., Gao, T.-G. & Wang, W. (2016) Phylogeny of <em>Impateins</em> (Balsaminaceae): integrating molecular and morphological evidence into a new classification. <em>Cladistics:</em> 179–197. https://doi.org/10.1111/cla.12119</p>
<p>Arechaveleta (1886) <em>Bulletin de la societe botanique de France. </em>Au Bureau de la Societe, Paris.</p>
<p>Beentje, H. (2016) <em>The Kew Plant Glossary, an illustrated dictionary of plant terms. </em>2nd edition ed. s.l.. Royal Botanic Gardens Kew, Kew Publishing.</p>
<p>Ding, H.B., Yang, B., Zhou, S.-S., Maw, M.B., Maung, K.W. & Tan, Y.H. (2019) New contributions to the flora of Myanmar I. <em>Plant Diversity</em> 41: 135–151. https://doi.org/10.1016/j.pld.2019.05.002</p>
<p>Franchet, A.R. (1887) Lettres Botaniques AND Bulletin de la Société Botanique de France. <em>Bulletin de la Société Botanique de France </em>33: 444–449.</p>
<p>Hooker, J.D. (1872) <em>The flora of British India: Part I, Ranunculaceae to Polygaleae. </em>The Authority of the secretary of state for India in Council, London, pp. 440–483.</p>
<p>Hooker, J.D. (1908) <em>Archives du Muséum national d’histoire naturelle sér. 4</em> 10: 253<em>.</em></p>
<p>Hooker, J.D. (1913) <em>An epitome of the British Indian species of Impatiens: Records of the botanical survey of India </em>Volume IV<em>. </em>Calcutt, Calcutta superintendent government printing, India.</p>
<p>IUCN (2022) <em>Guidelines for usinf the IUCN Red List categories and criteria. Prepared by the Standards and Petitions Committee. </em>Available from: https://www.iucnredlist.org/documents/RedListGuidelines.pdf (accessed 23 May 2022)</p>
<p>Kress, W.J., DeFilipps, R.A., Farr, E. & Kyi, Y.Y. (2003) <em>A checklist of the trees, shrubs, herbs, and climber (Revised from the original works by J.H. Lace, R. Rodger, H. G. Hundley, and U Chit Ko Ko on the “List of trees, shrubs, herbs and principal climbers, etc. recorded from Burma”. </em>Department of Systematic Biology-Botany, National Museum of Natural History, Smithsonian Institution, Washington, DC.</p>
<p>Moon, A. (1824) <em>Catalogue of the indigenous and exotic Plants growing in Ceylon. </em>The Weslevan Mission Press, Colombo.</p>
<p>Ruchisansakun, S., Suksathan, R., Van der Niet, T., Lwin, S. & Janssens, S.B. (2017) <em>Impatiens</em> <em>tanintharyiensis</em>, (Balsaminaceae), a new species from Southern Myanmar. <em>Phytotaxa </em>296 (2): 171–179. https://doi.org/10.11646/phytotaxa.296.2.6</p>
<p>Ruchisansakun, S., Suksathan, P., Van der Niet, T., Smets, E.F., Lwin, S. & Janssens, S.B. (2018b) <em>Balsaminaceae</em> of Myanmar. <em>Blumea</em> 63: 199–267. https://doi.org/10.3767/blumea.2018.63.03.01</p>
<p>Ruchisansakun, S., Suksathan, P., Van der Niet, T., Smets, E.F., Lwin, S. & Janssens, S.B. (2018a) Three new species of <em>Impatiens</em> (Balsaminaceae) from Myanmar. <em>Phytotaxa </em>338 (1): 63–74. https://doi.org/10.11646/phytotaxa.338.1.5</p>
<p>Trimen, H. (1893) <em>A hand-book to the flora of Ceylon, Part I. Ranunculaceae-Anacardiaceae. </em>Dulau and Co., 37 Soho Square, W. The authority of the government of Ceylon, London, pp. 200–212.</p>
<p>Wight, R. (1840) <em>Illustration of Indian botany or figures illustrative of each of the natural orders of Indian plants</em>, Volume I<em>. </em>J. B. Pharoah, Madras. https://doi.org/10.5962/bhl.title.9603</p>
<p>Wu, Z.Y., Raven, P. & Hong, D.Y. (2007) <em>Flora of China </em>Volume 12<em> (Hippocastanaceae through Theaceae). </em>s.l.:Science Press, Beijing and Missouri Botanical Garden Press, St. Louis, 534 pp.</p>
<p>Yang, B., Zhou, S.-S., Maung, K.W. & Tan, Y.-H. (2017) Two new species of <em>Impatiens</em> (Balsaminaceae) from Putao, Kachin State, northern Myanmar. <em>Phytotaxa, </em>321(1), p. 103–113. https://doi.org/10.11646/phytotaxa.321.1.4</p>
<p>Yuan, Y.M., Song, Y., Geuten, K., Rahelivololona, E., Wohlhauser, S., Fischer, E., Smets, E. & Küpfer, P. (2004) Phylogeny and biogeography of Balsaminaceae inferred from ITS sequences. <em>Taxon </em>53: 391–404. https://doi.org/10.2307/4135617</p>
<p>Yu, S., Janssens, S.B., Zhu, X.-Y., Lidén, M., Gao, T.-G. & Wang, W. (2016) Phylogeny of <em>Impateins</em> (Balsaminaceae): integrating molecular and morphological evidence into a new classification. <em>Cladistics:</em> 179–197. https://doi.org/10.1111/cla.12119</p>