Begonia mekonggensis Girm. & Wiriad. in Reinwardtia 13(1): 70. 2009

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Begonia Section

  • Petermannia

Diagnosis

Description

  • Stems erect, terete, rooting at base, brownish red, glabrous, swollen at the nodes, branching, 0.4-0.5 cm in diameter, internodes 3-6 cm long, up to 50 cm tall.

    Stipules glabrous, narrowly triangular, margin entire, apex acuminate, persistent, pale yellow, 1.7-2.1 x 0.6-0.8 cm. Leaves petiole dark red, glabrous, terete, 2-5 cm long; lamina glabrous on both sides, oval, asymmetric, base slightly oblique, lobes not overlapping, margin biserrate, apex acuminate 6-14 x 3-7 cm, broad side 2.5-5 cm wide, narrow side 1.5-2.5 cm wide, basal lobe 1-1.5 cm long; venation palmate-pinnate, 1-2 pairs of veins at the base, 2-3 pairs along the midrib, 1-3 in the basal lobe, branching towards the margin, veins impressed above, prominent beneath.

    Inflorescences unisexual (plants dioecious), axillary, dichasial, somewhat pendant, glabrous, peduncles reddish green. Bracts glabrous, green, boatshaped, rather translucent, persistent, ca. 1 x 0.5 cm.

    Male flowers pedicels reddish-white, 2-2.5 cm long; tepals 2, white or reddish, margin entire, apex rounded, 1.1 x 1.1-1.9 cm; stamens yellow, forming a narrow fan, filaments pale yellow, 1-1.5 mm long, anthers yellow, broadly obovate, 1-1.5 mm long, apex notched, opening by slits along the sides, almost as long as the anthers.

    Female flowers pedicels white, 3-5 mm long; ovary reddish green, with 3 equal wings, 1.2-1.9 cm long, 3 locular, placentae axillary, bifid; tepals 5, white to reddish, broadly elliptic, glabrous, up to 15-16 x 6-12 mm, styles 3, orange, forked once, 5 mm long.

    Fruits dehiscent capsules, green, on 3-5 mm long pedicels, with 3 equal wings, broadly triangular, acuminate at the base, widest at the apex, ca. 8 x 14 mm; stigmas caducous. Seeds barrel-shaped, ca. 0.4-0.45 mm long, collar cells less than half the seed length. (Girmansyah, D., Wiriadinata, H., Thomas, D.C. & Hoover, W.S., Two new species and one new subspecies of Begonia (Begoniaceae) from Southeast Sulawesi, Sulawesi, Indonesia in Reinwardtia 13(1). 2009)

Habitat

  • Secondary forest at 700 to 800 m asl.

Conservation

Distribution

Indonesia; endemic to Sulawesi, so far only known from three localities (Gunung Mekongga, Mangkutana-Pendolo divide and Rantepao-Palopo divide). (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.)

Etymology

Notes

Specimens

  • INDONESIA. Sulawesi, Southeast Sulawesi: North Kolaka, Ranteangin District, Tinukari Village, 03 Aug. 2009, Agus Rinai et al. AR 012 (BO); North Kolaka, Ranteangin District, Tinukari Village, 07 Aug. 2009, A. Hidayat et al. AH 4187 (BO); North Kolaka, 19 Mar. 2006, H. Wiriadinata et al. 588 (BO); North Kolaka, Ranteangin District, Tinukari Village, 29 June 2011, E.A. Widjaja EAW 9693 (BO).