Lectotypifiction of Impatiens duclouxii Hook.f., a new addition to the flora of India from Arunachal Pradesh

For Focus, Scope, Aims, Policies, and Guidelines visit https://threatenedtaxa.org/index.php/JoTT/about/editorialPolicies#custom-0 For Article Submission Guidelines, visit https://threatenedtaxa.org/index.php/JoTT/about/submissions#onlineSubmissions For Policies against Scientific Misconduct, visit https://threatenedtaxa.org/index.php/JoTT/about/editorialPolicies#custom-2 For reprints, contact <ravi@threatenedtaxa.org> Note Lectotypifiction of Impatiens duclouxii Hook.f., a new addition to the flora of India from Arunachal Pradesh

The floristic diversity of the northeastern region of India is not well-documented due to its inaccessibility and difficult terrain. Impatiens is one such floristic genus that is not well-documented from the state of Arunachal Pradesh, a part of the eastern Himalaya. The genus is represented in India by more than 210 species (Bhaskar 2012), of which 137 are endemic (Vivekananthan et al. 1997;Swaminathan et al. 2001). In the recent past, however, many new species of Impatiens were discovered (Gogoi & Borah 2013a,b,c,d,e, 2017aGogoi et al. 2017a,b;Hareesh et al. 2016aHareesh et al. ,b, 2017aHareesh & Sabu 2017;Liden & Bharali 2017), rediscovered (Gogoi et al. 2013b), and extended in range (Gogoi & Borah 2013b;Borah et al. 2015;Gogoi et al. ,b, 2016Tiwari et al. 2018) in the region.
During two expeditions to the West and East Kameng districts of Arunachal Pradesh in 2014 and 2017, respectively, one specimen of Impatiens with redspotted yellow-coloured flowers was collected. After critical examination of the specimen and of the detailed glabrous, bud yellowish-green with red spots, pedicel to 1.5cm long, green, bracts at the base, triangular, persistent, apex acute, mid-vein indistinct, glabrous. Lateral sepals two, obovate to orbicular, greenish-white, sometimes with red spots, to 1.3 x 1.5 cm, apex minutely mucronate, margins entire. Lower sepal bucciniform, pale yellow, up to 2.5cm long, spur coiled, up to 1.2cm long, yellow. Upper petal obovate, pale yellow with red spots, to 2 x 1.7 cm, apex emarginated, dorsally with a prominent horn, horn pale green. Lateral united petals pale yellow with red spots in basal lobe, bilobed, subequal, up to 3cm long (whole), basal lobe obovate, apex slightly emarginate, up to 1.5cm long, 1cm wide, clawed, distal lobe dolabriform, apex obtuse, 2cm long, 1.3cm wide, basal auricle orange, triangular, 2mm long. Stamens five, united, upright, 8mm long, anther lobes acute. Capsule not seen.
Flowering & fruiting: July-November Habitat: The species was found growing in a moist habitat at 30-45 0 C in a gentle slope along a small stream in Jamiri area in West Kameng District. It was later collected from Richikurung of East Kameng District, where the area is dominated by Terminalia myriocarpa, Ficus semicordata, Bauhinia purpurea, Saurauia  Distribution: China and India (West Kameng District in Jamiri, Arunachal Pradesh).
Conservation status: Chen et al. 2008 mentioned neither the distribution of the species in Yunnan in China nor its population. Herbarium records show that this species is represented by ca. 120-year-old collections. Therefore, it could have an extended distribution and new species record in India. Based on the distribution records, the authors would like to assess the species as Indeterminate (I) due to insufficient information on its distribution. Intensive explorations are required in similar habitats in adjacent areas for the possible location of the species. During the present survey, only 12 mature individuals were located, which were growing as undergrowth in a semi-evergreen forest along a stream.
Lectotypification: While describing this species, Hooker (1908) referred to three herbarium sheets of I. duclouxii as held at P, E & K (P -Herbarium,Muséum National d'Histoire Naturelle, Paris France; E -Herbarium, Royal Botanic Gardens, Edinburgh, EH3 5LR,. Scotland, UK; K -Herbarium, Royal Botanic Gardens, Kew, Richmond Surrey. TW9 3AE, England. UK. LWG). Among these, one sheet, A. Henry 12559 (K000694008) (Image 2), was selected as the lectotype. This sheet was examined by Hooker and found to closely match the protologue. Since the other sheets with the same collection number by A. Henry 12559 (E00313630) are regarded as part of the original gathering and match the protologue, it is here designated as an isolectotype.
Other  www.threatenedtaxa.org The Journal of Threatened Taxa (JoTT) is dedicated to building evidence for conservation globally by publishing peer-reviewed articles online every month at a reasonably rapid rate at www.threatenedtaxa.org. All articles published in JoTT are registered under Creative Commons Attribution 4.0 International License unless otherwise mentioned. JoTT allows allows unrestricted use, reproduction, and distribution of articles in any medium by providing adequate credit to the author(s) and the source of publication.