Sunday, June 7, 2020

[Botany • 2020] Capparis macrantha (Capparaceae) • A New Shrub Species from A Deciduous Forest of the Nam Kading National Protected Area (central Lao PDR)

Capparis macrantha Souvannakhoummane, Fici & Lanorsavanh

in Souvannakhoummane, Fici, Lanorsavanh, ... et Bounithiphonh, 2020. 

Capparis macrantha Souvannakhoummane, Fici & Lanorsavanh sp. nov.a new shrub species characterized by erect or ascending habit, stipular thorns, large lanceolate-elliptic leaves and large flowers in supra-axillary rows, is described and illustrated from the deciduous forest in Nam Kading National Protected Area (central Lao PDR). The new species belongs to Capparis sect. Monostichocalyx Radlk. and is morphologically similar to C. radula Gagnep., a shrub widespread in the Indochinese area, differing in the shorter, straight stipular thorns, larger leaves, larger sepals and petals, higher number of stamens with longer filaments and longer gynophore and ovary. Its affinities with related taxa are discussed and a key is provided for the species of Capparis L. known from Lao PDR. The conservation status of the new species is provisionally assessed as Vulnerable (VU D1).

Keywords: Bolikhamxai Province; Capparaceae; Capparis sect. Monostichocalyx; diversity; ecology

Fig. 1. Capparis macrantha Souvannakhoummane, Fici & Lanorsavanh sp. nov.
A. Flowering branch. B. Flower (lateral view). C. Flower (front view). D. Stipular thorn and petiole. E. Sepals. F. Petals. G. Gynophore and ovary. H. Stamens. 
Drawn from holotype (Lanorsavanh et al. SL1641) by K. Souvannakhoummane.

Fig. 2. Capparis macrantha Souvannakhoummane, Fici & Lanorsavanh sp. nov. 
A. Habit and detail of a branch bearing thorns. B. Flowering branch. C. Young twigs. D. Young leaves. E. Flower (top view). F. Flower (lateral view). G. Petal (outside view).
 Photos by S. Lanorsavanh.

Class Magnoliopsida Brongn.
Order Brassicales Bromhead

Family Capparaceae Juss.

Genus Capparis L.
Section Monostichocalyx Radlk.

Capparis macrantha Souvannakhoummane, Fici & Lanorsavanh sp. nov. 

Diagnosis: A C. radula Gagnep. stipulis rectis brevioribus, foliis majoribus, sepalis petalisque majoribus, staminum numero superiore, filamentis longioribus, gynophoro atque ovario longioribus praecipue differt. 

Etymology: The specific epithet is composed of the Greek words ʻmakrósʼ, meaning ʻlargeʼ, and ʻánthosʼ, ʻflowerʼ.

Distribution, habitat and phenology: The new species is so far known from a single location in the Nam Kading National Protected Area in Bolikhamxai Province, ... (Fig. 3). Capparis macrantha sp. nov. has been observed in mixed deciduous forest on limestone, at ca 200–230 m elevation, with Amorphophallus laoticus Hett., Arisaema Mart. sp., Wurfbainia glabrifolia (Lamxay & M.F.Newman) Škorničk. & A.D.Poulsen. The flowering occurs from May to June.

 Keooudone Souvannakhoummane, Silvio Fici, Soulivanh Lanorsavanh, Jeong Ho Park, Ho Sang Kang and Chaloun Bounithiphonh. 2020. Capparis macrantha sp. nov. (Capparaceae, Brassicales), A New Shrub Species from A Deciduous Forest of the Nam Kading National Protected Area (central Lao PDR). European Journal of Taxonomy. 656; 1–12.  DOI: 10.5852/ejt.202.656