Begonia flacca Irmsch. sec. in Webbia 9: 486. 1954

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https://drive.google.com/uc?id=0ByfNqmPv0ZrIMVZhWDByQ0xfTXc

Begonia Section

  • Petermannia

Original Publication

  • Webbia 9: 486. 1954

Habitat

Conservation

Distribution

Indonesia; endemic to Sulawesi, Southeast Sulawesi (Danau Biru, Kendari, Tamborasi, Tanjung Peropa, Uluiwoi and Wawonii Island). (Ardi, W.H., Chikmawati, T., Witono, J.R. & Thomas, D.C. (2018). A synopsis of Begonia (Begoniaceae) of Southeastern Sulawesi including four new species. Phytotaxa 381.1: 027-050.)

Notes

  • Begonia flacca was previously only known from a few specimens. The recently collected material from Kolaka, Tanjung Peropa and Wawonii Island indicates that it is relatively widespread in lowland forests on limestone in Southeast Sulawesi.
    Begonia flacca is a morphologically highly variable species. At least three populations were observed and differentiated during field work in Southeast Sulawesi. These populations show considerable variation in leaf morphology and indumentum characters. The first population was observed in Tanjung Peropa. The individuals in this population tend to have hairier stems and petioles compared to the other two populations from Kolaka and Wawonii. Other differences are related to leaf shape. The Tanjung Peropa population has elliptic leaves that have dentate to bisserate margins and are adaxially sparsely bristly between the veins. The Kolaka population is morphologically more variable than the populations in Tanjung Peropa and Wawonii. Generally the individuals in the Kolaka population are glabrous, the leaves are ovate to elliptic with entire to biserrate to slightly lobed (up to 25% of the lamina width) margins. Individuals within this population show different colour forms; some plants show reddish-brownish stems and leaves indicating a high anthocyan content. Moreover the shape of the ovary and wings are also variable, with considerable variation observed within the populations. The ovary can be obovoid, ellipsoid or cylindrical, and the wings rounded to cuneate at the base and truncate to slightly convex at the apex. Only a single individual was collected on Wawonii Island. It has ovate leaves with shallowly lobed margins. However, although some morphological differences were noticed, none seem complex enough to warrant formal taxonomic separation. All collections have the same characteristic inflorescence structure: single female flowers, frequently paired with a single male flower, and basal to the main male inflorescences, which are composed of one to three monochasial partial inflorescences. (Ardi, W.H., Chikmawati, T., Witono, J.R. & Thomas, D.C. (2018). A synopsis of Begonia (Begoniaceae) of Southeastern Sulawesi including four new species. Phytotaxa 381.1: 027-050.)

Specimens

  • INDONESIA. Sulawesi, Southeast Sulawesi: Kendari, Peninsula SE of Kendari, 1874, O, Beccari CB4501 (FI); Kendari, 12 Apr. 1929, G.K. Kjellberg 1289 (S); Uluiwoi District, Cave Marmer, 28 Mar. 2006, Deden 717 (BO); South Konawe, Tanjung Peropa Forest Reserve, Moramo Waterfall, 1 Feb. 2017, W.H. Ardi WI 118 (BO, KRB, SING); South Konawe, Tanjung Peropa Forest Reserve, Moramo Waterfall, 1 Feb. 2017, W.H. Ardi WI 120 (BO, KRB, SING); South Konawe, Tanjung Peropa Forest Reserve, Moramo Waterfall, 1 Feb. 2017, W.H. Ardi WI 121 (BO, KRB, SING); North Kolaka, Tamborasi, 4 Feb. 2017, W.H. Ardi WI 137 (BO, KRB, SING); North Kolaka, Tamborasi, 4 Feb. 2017, W.H. Ardi WI 138 (BO, KRB, SING); North Kolaka, Tamborasi, 4 Feb. 2017, W.H. Ardi WI 139 (BO, KRB, SING); North Kolaka, Tamborasi, 4 Feb. 2017, W.H. Ardi WI 140 (BO, KRB, SING); North Kolaka , Danau Biru, 4 Feb. 2017, W.H. Ardi WI 141 (BO, KRB, SING); North Kolaka, Danau Biru, 4 Feb. 2017, W.H. Ardi WI 142 (BO, KRB, SING); North Kolaka, Danau Biru, 4 Feb. 2017, W.H. Ardi WI 143 (BO, KRB, SING); Wawonii Island, Tekonea village, 24 Feb. 2017, W.H. Ardi WI 182 (BO, KRB, SING).