Begonia lasioura D.C.Thomas & Ardi in Edinburgh J. Bot. 68(2): 233. 2011

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Begonia Section

  • Petermannia

Diagnosis

  • Begoniae didymae D.C.Thomas & Ardi in indumento partium vegetativarum et generativarum bene evoluto, stipulis cum appendicula apicali longa pilosaque et fructus forma generali superficie similis sed a qua foliis distincte majoribus (8-21.5 × 6-12 cm nec 4.2-6.7 × 2.6-4.7 cm) et floribus in inflorescentiis masculis magis numerosis (usque ad c.15 nec 2[-3]) differt. - Type: Indonesia, Sulawesi, Sulawesi Selatan, Mankutana-Pendolo divide, 02°21'29.10S, 120°47'42.30E, 600 m, 3 v 2009, D.C. Thomas & W.H. Ardi 09-110 (holo E; iso BO, L). (Thomas, D.C., Ardi, W.H. & Hughes, M., Nine new species of Begonia (Begoniaceae) from South and West Sulawesi, Indonesia in Edinburgh Journal of Botany 68(2). 2011)

Description

  • Perennial, monoecious herb, stems erect, to c.60 cm tall, with a moderately dense to dense indumentum of multicellular, simple trichomes up to c.1.8 mm long and a sparse indumentum of microscopic, glandular trichomes on all above-ground vegetative parts. Stems branched; internodes c.2-17.5 cm long, reddish.

    Leaves alternate; stipules persistent, 16-26 × 6-10 mm, elliptic to oblong, with an abaxially prominent midrib projecting up to 12 mm at the apex; petioles 4-18 cm long, reddish; lamina 8-21.5 3 6-12 cm, very asymmetric, ovate to elliptic, base cordate and lobes not or sometimes slightly overlapping, apex long acuminate, margin serrate, teeth long bristle-pointed, adaxial surface dark green and abaxial surface pale green, primary veins 4-5, actinodromous, secondary veins craspedodromous.

    Inflorescences: protogynous; female inflorescences (1-)2-flowered, positioned one node below the male inflorescences or solitary, peduncles c.1-7 mm long; male inflorescences composed of 2-4 cymose-subumbellate partial inflorescences, each with (1-)2 compressed monochasia with 2-6 flowers, peduncles 13-26 mm long.

    Male flowers: pedicels 10-16 mm long; tepals 2, greenish when young, whitish or whitish tinged with pink at maturity, 7-11 × 8-11 mm, broadly ovate to suborbicular, base slightly cordate, apex rounded, abaxially with a sparse to moderately dense indumentum of multicellular, reddish hairs and microscopic glandular hairs; androecium of c.37-47 stamens, yellow, filaments up to c.1 mm long, slightly fused at the very base, anthers up to c.1 mm long, obovate, dehiscing through unilaterally positioned slits that are c.1/2 as long as the anthers.

    Female flowers: pedicels 1-2 mm long; tepals 5, whitish tinged with pink, unequal, the smaller 10-11 × 4-5 mm, ovate to elliptic, the larger 10-12 × 7-9 mm, ovate to elliptic, margin and abaxial surface with a sparse indumentum of microscopic glandular hairs and multicellular, reddish hairs; ovary ellipsoid, with a sparse indumentum of microscopic hairs and a moderately dense indumentum of reddish multicellular hairs, locules 3, placentation axile, placentae bilamellate, wings 3, triangular, subequal, base rounded, apex truncate, style basally fused, 3-branched, each stylodium bifurcate in the stigmatic region, stigmatic surface a spirally twisted papillose band, orange. Fruiting pedicels 1-4 mm long.

    Fruits ellipsoid, 12-14 × 4-6 mm (excluding the wings), moderately densely hairy to glabrescent, dehiscent, splitting along the wing attachment, wing shape as for ovary, 6-8 mm wide at the widest point (at the apex); seeds ellipsoidal, c.0.3 mm long, collar cells c.1/2-2/3 of the length of the seed. (Thomas, D.C., Ardi, W.H. & Hughes, M., Nine new species of Begonia (Begoniaceae) from South and West Sulawesi, Indonesia in Edinburgh Journal of Botany 68(2). 2011)

Habitat

  • This species grows lithophytically in full shade on rock walls in primary rainforest between c.500 and 1000 m above sea level. (Thomas, D.C., Ardi, W.H. & Hughes, M., Nine new species of Begonia (Begoniaceae) from South and West Sulawesi, Indonesia in Edinburgh Journal of Botany 68(2). 2011)

Conservation

  • Proposed IUCN conservation category: Least Concern (LC). Several subpopulations of Begonia lasioura were observed along the road connecting Mankutana and Pendolo, where the species is locally common. All of the collection sites and observed subpopulations lie in close proximity, but outside the Pegunungan Feruhumpenai Nature Reserve (IUCN category 1a). However, further exploration might reveal that the distribution of this species extends into this protected area. Given the occurrence of extensive stretches of high quality primary forest on the Pendolo-Mankutana divide, an IUCN conservation category of LC seems to be indicated. (Thomas, D.C., Ardi, W.H. & Hughes, M., Nine new species of Begonia (Begoniaceae) from South and West Sulawesi, Indonesia in Edinburgh Journal of Botany 68(2). 2011)

Distribution

Asia-Tropical:, Sulawesi (Sulawesiendemic)
See Images for a distribution map, and specimen tab for map of point distribution data of georeferenced specimens.

Endemic to Indonesia, Sulawesi, South Sulawesi.

Etymology

  • The specific epithet is a compound of lasio (Greek - shaggy) and oura (Greek - tail). The specific epithet refers to the apical appendices of the stipules of this species, as well as the long appendiculate apices of the leaves (see Images). Both short apical stipule appendages formed by protruding midribs and apiculate apices of the leaves are common in many species in Begonia section Petermannia. However, the apical stipule appendages of Begonia lasioura are notable as they can comprise up to almost half of the length of the stipules and are distinctly hairy, and the drip-tips of the hairy leaves are more distinct than in most Sulawesi species. (Thomas, D.C., Ardi, W.H. & Hughes, M., Nine new species of Begonia (Begoniaceae) from South and West Sulawesi, Indonesia in Edinburgh Journal of Botany 68(2). 2011)

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...)