Begonia macintyreana M.Hughes [§ Petermannia

Ardi, W. H. & Thomas, D. C., 2022, SYNOPSIS OF BEGONIA (BEGONIACEAE) FROM THE NORTHERN ARM OF SULAWESI AND SANGIHE ISLAND, INDONESIA, INCLUDING THREE NEW SPECIES, Edinburgh Journal of Botany 79 (405), pp. 1-50 : 28

11. Begonia macintyreana M.Hughes [§ Petermannia ], Edinburgh J. Bot. 63: 194 (2006).

– Type: Indonesia, Sulawesi, Gorontalo, near Tulabolo , 4 iv 2002, M. Mendum et al. 2 (holotype E [E00163204]; isotypes A, E [E00163204], K [K001235146], L [ L0333856 ]) .

Distribution. Indonesia: endemic to Sulawesi, North and Gorontalo Provinces (see Figure 2 ).

Habitat. This species was observed growing on a steep bank in secondary forest, in full shade, at c. 180 m elevation.

Proposed IUCN conservation category. Data Deficient (DD). This species is known from only two collections, both of which were collected at the border of the Bogani Nani Wartabone National Park. There is no available information about current threats, habitat conditions and population sizes. Furthermore, the forests in the wider area of the national park are very poorly collected. Consequently, we assess this species as Data Deficient ( IUCN Standards and Petitions Subcommittee, 2019).

Additional specimens examined. INDONESIA. Sulawesi. Northern arm of Sulawesi. Central North Sulawesi: Dumoga Bone National Park, Suwawa District , 27 xii 1994, JJ. Afriastini & Rohajawati JJA2918 (E, K) . Eastern North Sulawesi: Sulawesi Utara, 27 xii 1994, J. Juanda 22 (K) .

Begonia macintyreana is endemic to North and Gorontalo Provinces. It is known from only two collections. The species is characterised by a character combination including: an erect growth habit; a glabrous stem; ovate, bullate leaf lamina; complexly branching male inflorescences (a compound thyrse with monochasial partial inflorescences) with numerous flowers; and female flower tepals that are ovate to lanceolate and have an acute apex.

Figures

Figure 2. Distribution maps of Begonia species occurring on the northern arm of Sulawesi. Distribution points are from georeferenced collections from major herbarium collections (B, BO, E, K, KRB, L, SING), the Begonia Resource Centre (Hughes et al., 2015–) and the Sulawesi Begonia Data Portal (Thomas et al., 2013, continuously updated).