Two new epiphytic species of Impatiens L. (Balsaminaceae) from the southern Western Ghats, India

Saravanan, T.; Kaliamoorthy, Seventhilingam

doi:10.11646/phytotaxa.552.1.10

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“…There has been an explosive radiation in the plant genus Impatiens Linnaeus (Balsaminaceae) in the last 5–6 million years ( Janssens et al, 2009 ), with over 1,000 extant species distributed in diverse habitats from wet and montane forests of the tropical and subtropical regions of the Old World to temperate regions of Asia, Europe, and N. America ( Grey-Wilson, 1980b ). Indeed, new species of Impatiens are being discovered regularly ( e.g ., Xia et al, 2019 ; Mohan et al, 2020 ; Gu et al, 2021 ; Saravanan & Kaliamoorthy, 2022 ). While there are larger genera ( e.g ., Astragalus ), Impatiens is particularly interesting as Hydrocera Wight & Arnott, the only other genus in the family, has only one species, H. triflora .…”

Section: Introductionmentioning

confidence: 99%

De-novo whole genome assembly of the orange jewelweed, Impatiens capensis Meerb. (Balsaminaceae) using nanopore long-read sequencing

Gadagkar,

Baeza,

Buss

et al. 2023

PeerJ

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The plant family Balsaminaceae comprises only two genera, and they are a study in contrasts. While Impatiens is an impressively prolific genus, with over 1,000 species and more being discovered each year, its sister genus, Hydrocera, has one solitary species, H. triflora. The two genera also differ in geographic distribution and habitat type (Impatiens species are widely distributed in much of the Old World and N. America, while H. triflora is confined to wetlands specific to S. India, Sri Lanka, and SE Asia). Other contrasting features include plant habit, habitat, floral architecture, mode of seed dispersal, and a host of other traits. The family Balsaminaceae is therefore an excellent model for studying speciation and character evolution as well as understanding the proximal and evolutionary forces that have driven the two genera to adopt such contrasting evolutionary paths. Various species of the Impatiens genus are also commercially important in the ornamental flower industry and as sources of phytochemicals that are of medicinal and other commercial value. As a preliminary step towards studying the genomic basis of the contrasting features of the two genera, we have sequenced and assembled, de novo, the genome of an iconic Impatiens species from N. America, namely I. capensis, and report our findings here.

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