Begonia matarombeoensis D.C.Thomas & Ardi

Ardi, Wisnu H., Chikmawati, Tatik, Witono, Joko R. & Thomas, Daniel C., 2018, A synopsis of Begonia (Begoniaceae) of Southeastern Sulawesi including four new species, Phytotaxa 381 (1), pp. 27-50 : 41-42

7. Begonia matarombeoensis D.C.Thomas & Ardi in Thomas et al. (2018: 166) ( Figures 1 & 8 )

Sect. Petermannia

Type:— INDONESIA. Sulawesi, Southeast Sulawesi: N of Linomoyo, Matarombeo , 14 February 2017, W.H. Ardi WI 154 (holotype BO!; isotypes KRB!, SING!) .

Distribution:— Indonesia; endemic to Sulawesi, Southeast Sulawesi, Matarombeo. Locally common.

Habitat:— Rock walls at the base of limestone cliffs and limestone boulders, in dense to light shade, at ca. 2–200 m elevation.

Notes:— Begonia matarombeoensis can be easily differentiated from the rest of the species in section Petermannia by its basally thickened stem with shortened internodes, the complexly branching (paniculate-cymose) and many-flowered male inflorescences, the relatively long peduncles of the female inflorescences (up to 4.2 cm long), and the recurved pedicels of the fruits ( Thomas et al. 2018). Begonia matarombeoensis occupies a similar niche as B. siccacaudata Doorenboos (2000: 400) which grows on coralline limestone cliffs and limestone boulders in Southwest Sulawesi.

Provisional IUCN conservation assessment:— Endangered EN B1ab(iii),B2ab(iii) ( Thomas et al. 2018).

Additional specimens examined:— INDONESIA. Sulawesi, Southeast Sulawesi: N of Linomoyo, Matarombeo, Anoa forest camp, 30 m, 14 Feb. 2017, W.H. Ardi WI 155 ( BO, KRB, SING) ; Matarombeo, Telaga biru, ca. 14 km west of Mataraki bridge, 115 m, 19 Feb. 2017, W.H. Ardi WI 172 ( BO, KRB, SING) ; Matarombeo, ca. 20 km west of Mataraki bridge, 194 m, 19 Feb. 2017, W.H. Ardi WI 178 ( BO, KRB, SING) .

Figures

FIGURE 1. Distribution map.A. Overview of Sulawesi. B. Distributions of B. aptera, B. johntania, B. mekonggensis, and B. ozotothrix.C. Distributions of B. balgooyi, B.flacca, B. matarombeoensis, and B. watuwilensis. D. Distributions of B.incudiformicarpa, B. iskandariana, and B. tumburanoensis. Specimen location information was georeferenced using the GeoNames geographical database at http://www. geonames.org/.

FIGURE 8. Begonia matarombeoensis. A. Habit; scale bar: 10 cm. B. Habit, anthocyan-rich form; scale bar:10 cm C. Male inflorescences; scale bar 3 cm. Inset: male flower; scale bar 10 mm. D. Female inflorescence; scale bar: 3 cm. Inset: female flower; scale bar: 10 mm. E. Fruit; scale bar: 2 cm. Inset: ovary, cross section of middle part; scale bar: 5 mm.A, C–E from Ardi, W.H. 154; B from Ardi, W.H. 155 (Photos: W.H. Ardi).