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Sisyrinchium L. (Iridaceae, Iridoideae, Sisyrinchieae) is the most diverse genus in the tribe consisting of approximately 200 species (Henderson 1976; Rudall et al. 1986), and is mostly distributed in the new world (Henderson 1976; Cholewa & Henderson 1984; Nicolella & Ardenghi 2013). The taxonomy of Sisyrinchium is complex (Chauveau et al. 2011) and hence, taking detailed field notes, remaining extra-cautious while preserving specimens, and by using large samples to evaluate multiple characters help in identification of species and filling the taxonomic gaps (Henderson 1976) are important. It prefers wet to dry grasslands, rocky and sandy soils, roadsides, grazed and burnt fields (Bicknell 1899). In July of 2017 an unfamiliar species of Sisyrinchium was collected from Trongsa District of central Bhutan. After perusal of relevant literatures (Bicknell 1899; Goldbatt et al. 1990; Yamaguchi & Hirai 1987; Henderson 1976; Chauveau et al. 2011; Shin et al. 2016) it was identified as Sisyrinchium rosulatum E.P.Bicknell. It is native to the southern part of North America and some part of South America (Bicknell 1899; Goldbatt & Manning 2008; Nicolella & Ardenghi 2013) and is reported as an invasive species in Korea (Shin et al. 2016), and also exotic to 22 countries (PlantNET 2013). For the Flora of Bhutan Noltie (1994) recorded a total of 13 species representing five genera (Iris, Gladiolus, Crocosmia, Eleutherine, Belamcanda). Now, with the addition of Sisyrinchium rosulatum, the numbers for genus and species increased to six and 14, respectively in this family for the flora of Bhutan.

Sisyrinchium rosulatum E.P.Bicknell (Iridaceae): new record of a naturalized species in Bhutan