Begonia macintyreana M.Hughes in Edinburgh J. Bot. 63(2-3): 194. 2006

Primary tabs

https://drive.google.com/uc?id=0ByfNqmPv0ZrIenlQaEZ6eTlvdU0

Begonia Section

  • Petermannia

Diagnosis

  • A Begonia imperfecta Irmsch. omnino glaberrima (haud secus venos ferruginea), tepalis masculis ad apices acutis, et inflorescentia cymosa (haud subumbellata) recedit. - Type: Sulawesi, Gorontalo, near Tulabolo, in dense shade on steep bank near track in disturbed secondary forest, 177 m, 4 iv 2002, M. Mendum, H.J. Atkins, M.F. Newman, Hendrian & A. Sofyan 2 (holo E; iso E, L). (Four new species of Begonia (Begoniaceae) from Sulawesi. Edinburgh J. Bot. 63.: 191-199. 2006.)

Description

  • Erect glabrous branching herb to c.80 cm high.

    Stem woody at base, c.12 mm across, internodes 5-8 cm.

    Stipules 10 × 8 mm, broadly lanceolate with a filiform extension at the tip, semi-persistent. Petioles 4-7 cm long. Leaves very asymmetric, up to c.15 cm long from base to tip and up to 7 cm wide, midrib 6-10 cm, ovate-lanceolate with an acute tip, margin scalloped and denticulate, cordate at the base, deep glossy green above and pale grey-green below.

    Inflorescence bisexual, terminal or axillary, protogynous; bracts lanceolate, 3 mm long, deciduous.

    Male flowers borne distally to the female in a monochasial cyme usually comprised of three main axes each with c.30 male flowers; tepals 2, 12 × 12 mm, shield shaped, base sub-cordate to truncate, apex slightly pointed, white; stamens c.35, yellow, anthers c.0.75 mm long, dehiscing through slits c.half as long as the anther, filaments up to twice as long, slightly fused at the base.

    Female flowers borne in pairs at the base of the inflorescence; pedicels c.12 mm long; tepals 5, equal, ovate-lanceolate, 20 × 13 mm, white to palest pink; styles 3, twice spirally twisted, orange, deciduous; ovary 12 × 18 mm with 3 equal wings, obtusely indented across the apex, pale pink with darker venation, placentation axile, placentae bifid, wings rounded at the base, acute at the tip, extended distally.

    Fruit 15 × 22 mm, drying pale brown, dehiscent; capsule oval, 8 × 5 mm. Seeds barrel shaped, c.0.3 mm long, collar cells c.2/3 the length of the seed. (Four new species of Begonia (Begoniaceae) from Sulawesi. Edinburgh J. Bot. 63.: 191-199. 2006.)

Habitat

  • This species was observed growing on a steep bank in secondary forest, in full shade, at c.180 m above sea level.

Conservation

  • Proposed IUCN category: VU D2. (Four new species of Begonia (Begoniaceae) from Sulawesi. Edinburgh J. Bot. 63.: 191-199. 2006.)

Distribution

Asia-Tropical:, Sulawesi (Sulawesiendemic)
Endemic to Indonesia, Sulawesi, Sulawesi Gorontalo and North Sulawesi.

See specimen tab for map of point distribution data of georeferenced specimens.

Etymology

  • It is named in honour of Mr and Mrs Malcolm L. MacIntyre, the founders of the M. L. MacIntyre Begonia Trusts, which have facilitated much research into the genus.

Notes

  • In cultivation this species forms a splendid hemispherical mound nearly a metre across, and has a long flowering period. The scalloped edge to the leaf is characteristic of many species of Begonia from Sulawesi. (Four new species of Begonia (Begoniaceae) from Sulawesi. Edinburgh J. Bot. 63.: 191-199. 2006.)

Molecular Systematics

  • GenBank
  • see Thomas et al., 2012 (Thomas, D.C., Hughes, M., Phutthai, T., Ardi, W.H., Rajbhandary, S., Rubite, R., Twyford, A.D. & Richardson, J.E., West to east dispersal and subsequent rapid diversification of the mega-diverse genus Begonia (Begoniaceae) in the Malesian archipelago i...)