Monday, July 12, 2021

[Botany • 2021] Begonia robii (Begoniaceae) • A New Species of Begonia from Lima Puluh Kota, West Sumatra, Indonesia


Begonia robii Ardi & Girm.

in Ardi, Girmansyah & Hughes, 2021.

A new species of Begonia sect. Jackia (Begoniaceae), Begonia robii Ardi & Girm., is described from West Sumatra and is a limestone karst endemic in the Tanah Datar dan Lima Puluh Kota Regency. Its provisional IUCN threatened category is considered to be Endangered.

Keywords: Endemic, limestone, Jackia

Begonia robii Ardi & Girm.
A. Plant habit. B. Stipules. C. Bracts. D. Inflorescence. E. Male flower, front view. F. Male flower, side view. G. Female flower, front view. H. Female flower, side view. I. Fruit. J. Ovary, cross section of middle part.
From Wisnu Ardi WI 761. Photos by W.H. Ardi. 

Begonia robii Ardi & Girm. sp. nov. 
§ Jackia.
A limestone adapted species closely related to Begonia droopiae Ardi (Ardi & Hughes, 2010), in terms of its habit and variegated leaves, however it can be easily distinguished by its rounded leaf apex which have pale green blotches between the veins (not acuminate at the apex and green on the veins only), outer male flower tepals which are elliptic to obovate with an acute to rounded apex (vs. elliptic to suborbicular with a rounded apex), female flowers with two or three tepals, outer tepals 4‒12 × 7‒8.5 mm, elliptic (vs. female flower with three tepals, outer tepals 5.5‒6 × 4.5‒ 6 mm, orbicular to suborbicular), ovary ca. 8 × 5‒ 6 mm, ovoid to ellipsoid, wings equal to subequal with a truncate to cuneate base, and a cuneate apex (vs. globose to broadly ellipsoid ovary, 6‒7 × 10‒13 mm, wings equal with rounded base and apex).

Distribution. Sumatra, endemic to West Sumatra, Lima Puluh Kota and Tanah Datar Regencies (Harau valley, Lintau Buo and Halaban). Fig. 1. 

Etymology. The epithet is after the collector, Robi Satria.

  Wisnu Handoyo Ardi, Deden Girmansyah and Mark Hughes. 2021. Begonia robii, A New Species of Begonia from Lima Puluh Kota, West Sumatra. Reinwardtia. 20(1); 37-41. DOI: 10.14203/reinwardtia.v20i1.4141


ABSTRAK ARDI, W. H., GIRMANSYAH, D. & HUGHES, M. 2021. Begonia robii, jenis baru Begonia dari Lima Puluh Kota, Sumatra Barat. Reinwardtia 20(1): 37–41.
 — Jenis baru Begonia seksi Jackia (Begoniaceae) dipertelakan dari Sumatra Barat, dan merupakan jenis endemik bebatuan kapur di Kabupaten Tanah Datar dan Lima Pulu Kota. Evaluasi status konservasi berdasarkan IUCN untuk Begonia robii adalah terancam. 
Kata kunci: Endemik, batu kapur, Jackia.