Studies on Schismatoglottideae (Araceae) of Borneo LXIX: Schismatoglottis imbakensis, a new species of the Patentinervia Complex from ultramafic rocks, Sabah

Abstract

Schismatoglottis imbakensis is described as a new species of the Schismatoglottis Patentinervia Clade from forested ultramafic rocks, and compared with S. retinervia Furtado, the only the species for the clade yet described from Sabah.

Checklist of aroids (Alismatales, Araceae) from Sabah (Malaysian Borneo)

“…Schismatoglottis imbakensis is distinguished from S. retinervia Engl., the only other species of the Patentinervia clade occurring in Sabah, by the plant glabrous (vs. petioles and abaxial midribs puberulous), by the naked sterile interstice of the spadix equalling the pistillate floret zone (vs. naked sterile interstice hardly developed), by the deep green pistils with the stigma about half the width of the ovary (vs. pistils dirty pale green with the stigma almost equalling the ovary width), by the staminate florets somewhat laxly arranged and the stamens readily discernible (vs. staminate florets very densely packed and individual stamens scarcely distinguishable). Schismatoglottis imbakensis is distinguished from S. pichinensis P.C.Boyce and S. puncakborneensis P.C.Boyce, the other two Patentinervia clade species with a long naked sterile interstice, by large rhomboidal cream interpistillar staminodes (vs. interpistillar staminodes lorate or if rhomboidal then small and white), the large, laxly arranged stamens (vs. small and congensted), and sharply pointed (vs. blunt) spadix appendix (Kartini et al 2020 (SAN). Identification.…”

“…A series of papers followed with Wong Sin Yeng and Kartini Saibeh describing new species of Homalomena Schott, Schismatoglottis Zoll. & Moritzi, and Piptospatha primarily from central and east Sabah (Boyce and Wong 2013;Boyce et al 2019;Kartini et al 2015aKartini et al , 2017Kartini et al , 2019Kartini et al , 2020Wong et al 2018Wong et al , 2019, and Boyce with David Scherberich described an astonishing new ornamental Schismatoglottis (S. scintillans Scherberich & P.C. Boyce (Scherberich and Boyce 2013).…”