Begonia didyma D.C.Thomas & Ardi

Thomas, Daniel C. & Ardi, Wisnu H., 2020, Synopsis of Begonia (Begoniaceae) of southwest Sulawesi and the Selayar Islands, Indonesia, including one new species, Phytotaxa 437 (2), pp. 73-96 : 80-81

4. Begonia didyma D.C.Thomas & Ardi in Thomas et al. (2009: 230)

Sect. Petermannia

Type:— INDONESIA. Sulawesi, Sulawesi Selatan, Latimojong, Palopo, Rantebala (cultivated at Bali Botanic Garden from living material collected in the wild), 16 May 2008, D.C. Thomas & W.H. Ardi 08-77 (holotype E!, isotype BO!).

Distribution:— Indonesia, endemic to Sulawesi, South Sulawesi: Latimojong Mountains ( Fig. 1A ).

Habitat:— Primary and disturbed hill rainforest, on rocky ground, between 1000 and 1500 m elevation.

Provisional IUCN conservation assessment:— Critically Endangered (CR) B1ab(iii), B2ab(iii). This species is known from only a few collections from the periphery of the Latimojong Forest Reserve. The collection localities are in forest patches close to human habitation and surrounded by land used for agricultural purposes (e.g. coffee plantations) and other severely disturbed forest vegetation. Exploration of various hill forest localities on the southern arm of Sulawesi have not resulted in any additional collections, and hence we must assume, until more extensive collection efforts reveal otherwise, that this species has a very restricted range. Because of the extremely small EOO and AOO in combination with observed disturbance and loss of forest habitat at the border of the Latimojong Forest Reserve we assess this species as Critically Endangered.

Additional specimens examined:— INDONESIA. Sulawesi. South Sulawesi: Todjamboe , 9 Feb. 1929, G. Kjellberg 1931 ( BO) ; Luwu District, Latimojong Mountain Range, Desa Lambanan Dusun Tibusan , 2 Nov. 1994, J.P. Mogea et al. 6596 ( BO) ; Salu River, Karangan, Rante Lemo , Enrekang, 16 June 2010, A.R. Kartonegoro 544 ( BO) .

Figures

FIGURE 1. Distribution maps of Begonia species occurring on the southwestern arm of Sulawesi or the Selayar Islands (georeferenced specimen data from major collections [B, BO, E, K, KRB, L, SING], the Begonia Resource Center [Hughes et al. 2015a], as well as some additional confirmed observations). Grey lines indicate 1° graticules.