Rachunia cymbiformis, a new genus and species of Gesneriaceae from Thailand

Abstract

Rachunia, a new genus of Gesneriaceae from Thailand, is described with a single species, Rachunia cymbiformis. Its relationship to the rest of subtribe Didymocarpinae is investigated through a phylogenetic study based on Bayesian Inference and Parsimony analyses of nuclear ITS and plastid trnL‐trnF (intron‐spacer) sequences. Morphologically, Rachunia differs from the related genera Codonoboea in the large boat‐shaped bracts and orthocarpic vs plagiocarpic fruit; from Microchirita in the bracts, wiry vs fleshy stem, the campanulate vs tubular corolla and the clavate vs chiritoid stigma, and from Henckelia in the clavate vs chiritoid stigma, large boat‐shaped bracts in the inflorescence, free and imbricate sepals, short and campanulate corolla, clavate stigma, and relatively robust orthocarpic fruit.

Michaelmoelleria (Gesneriaceae), a new lithophilous dwelling genus and species with zigzag corolla tube from southern Vietnam

“…Recently discovered new genera such as Somrania D.J.Middleton (Middleton and Triboun 2012), Tribounia D.J.Middleton (Middleton and Möller 2012), Chayamaritia D.J. Middleton & Mich. Möller (Middleton et al 2015) and Rachunia D.J.Middleton & C.Puglisi (Middleton et al 2018) further clarified this status. Besides, the uneven collection also seems to occur within Vietnam.…”

“…The generic delimitations in Asian Gesneriaceae are often ambiguous due to significant overlap in characters between genera (Burtt 1977), which has led to many revisions including synonymization of small and monotypic genera (Möller et al 2011a, b;Puglisi et al 2011;Weber et al 2011a, b;Möller et al 2016) and establishment or resurrection of new or previously synonymized genera in recent years (Wei et al 2010;Weber et al 2011c;Middleton and Triboun 2012;Middleton and Möller 2012;Middleton et al 2014Middleton et al , 2015Middleton et al , 2018. The combined phylogenetic-morphological approach was therefore performed as it takes both molecular and morphological evidence into account (Wei et al 2010).…”

Four new species of Gesneriaceae from Yunnan, Southwest China

“…Gesneriaceae (Lamiales) consists of ca. 150 genera and around 3500 species of perennial herbs, shrubs or small trees, with the main distribution in the tropics and subtropics (Weber et al 2013; Möller et al 2016a; Middleton et al 2018). In China, there are >600 species in 44 genera (Möller et al 2016a, b; Xu et al 2017).…”

Biogeography and evolution of Asian Gesneriaceae based on updated taxonomy

“…The number in the brackets is the species diversity of the genus. Phylogeny tree was redrawn based on Möller and Clark (2013) , Middleton et al (2015) , Puglisi et al (2016) , Möller et al (2016a) , Middleton et al (2018) .…”

“…Middleton ( Puglisi et al 2016 ; Puglisi and Middleton 2017 ), Rachunia D.J. Middleton ( Middleton et al 2018 ). Such significant revisions of so many genera call for an updated study about biogeography and evolution of the Asian Gesneriaceae .…”