New or Noteworthy Plant Collections from Myanmar (10): Impatiens hukaungensis (Balsaminaceae)^ a New Rheophyte from the Northern Region

摘要

A new species, Impatiens hukaungensis J. Murata & Nob. Tanaka (Balsaminaceae), is described from Kachin State, northern Myanmar. Tnis species is characterized by decumbent stem, oblanceolate leaves, 2-flowered simple raceme, white with purple mottleddorsal petal and purple dolabriform lateral united petals. Morphological characters, including its 2-flowered raceme and short fusiform capsules, as well as results of molecular phylogenetic analyses based on sequences of plastid atpB-rbcL region, suggest this new species belongs to Impatiens sect. Uniflorae Hook. f. & Thomson. It shows a rheophytic habit and grows along streams with high water-level differences.