Abstract
Impatiens longshanensis (The LSID for the name Impatiens longshanensis is: 77219154-1) sp. nov. and I. lihengiana (The LSID for the name I. lihengiana is: 77219153-1) sp. nov., from Hunan, China, are described and illustrated here. The molecular phylogenetic study suggests that I. longshanensis and I. lihengiana should be placed in the I. sect. Impatiens. A detailed description, diagnostic characters between the two new species and allied species, pollen and seed morphology, and color photographs are provided. In addition, based on wide sampling, we found that the longifilamenta group, an endemic group to China, whose members have basal lobes of lateral united petals with long filamentous hairs, shows significant morphological variability. In this paper, we discuss the taxonomic significance of morphological characteristics within this group. Based on a literature review and observation of living materials in the field, an updated identification key for this group is also proposed.
Highlights
Balsaminaceae comprises two genera, the monotypic Hydrocera Blume ex Wight & Arnott [1] and Impatiens Linnaeus [2]
The new species is morphologically similar to Impatiens davidii Franch, but differing in having narrowly elliptic or narrowly ovate-elliptic leaf blades; petiole 1.5–2.5 cm; lateral sepals yellow-green, purple spotted, 1-veined; lower sepal funnelform; dorsal petal apex long rostellate; lateral united petals not clawed, 2.5–2.8 cm long; and basal lobe ovate-lanceolate
Based on morphological evidence and molecular phylogenetic study, the two new species should be placed in Impatiens sect
Summary
Balsaminaceae comprises two genera, the monotypic Hydrocera Blume ex Wight & Arnott [1] and Impatiens Linnaeus [2]. Impatiens species occur in diverse habitats, such as in forest understories, roadside ditches, valleys, abandoned fields, along streams and in seepages, usually in mesic or wet conditions, some species can tolerate drier habitats [6]. Due to their beautiful appearance and long flowering period, many species of Impatiens are grown all over the world as ornamental plants [7]. This group is endemic to China, and markedly characterized by its 1- or 2-flowered racemose inflorescences, pedicel with 2 bracts, lower sepal saccate or funnelform, with striate, basal lobes of lateral united petals with a filamentous long hair. After careful examination of the relevant specimens and literature [5,16,17], the authors confirm the two as new species, and describe them here
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
