Friday, November 15, 2013

[Botany • 2013] เถากะไดลิง, เสี้ยวภูลังกา | Bauhinia nakhonphanomensis • A New Species of Bauhinia L. (Caesalpinioideae, Leguminosae) from Nakhon Phanom Province, northeastern Thailand


Bauhinia nakhonphanomensis Chatan
Bauhinia nakhonphanomensis closely resembles Bauhinia exurrens Stapf, known only from Mt Kinabalu Malaysia (Larsen and Larsen 1996). The two species are similar to each other by having entire leaves, anthers opening by longitudinal slits, short hypanthium (approx. 10 mm), petals not recurved and long pedicels more than 25 mm.

Abstract
A new liana species of the subfamily Caesalpinioideae (Leguminosae), namely Bauhinia nakhonphanomensis, collected from the Phulangkha National Park, Nakhon Pranom Province, Thailand, is described and illustrated. It is easily recognized by the following combination of characters: tendrilled liana, entire leaves, acuminate or caudate leaf apices, oblong or elliptic floral bud, floral bud 25–35 mm long, raceme or panicle inflorescence, 10–13 mm long hypanthium, anther opening by longitudinal slits. Important comparative morphological characters with some closely related species are discussed.

Keywords: Bauhinia nakhonphanomensis, Thailand, Leguminosae, Caesalpinioideae, new species


Figure 1. Bauhinia nakhonphanomensis
A Habit B Habit and inflorescences C Large and old stems forming flattened “Monkey-Ladders” D Old (green) and young (pinkish) leaves 

Figure 1. Bauhinia nakhonphanomensis
 E tendril F Inflorescence with many reddish bracteoles
G Inflorescence with many reddish bracteoles and reddish-green floral buds.

Flowering and fruiting: flowering April–July and fruiting unknown.

Distribution: This new species is an endemic to Thailand and known from only one location at Phulangka National Park, Ban Pheang District, Nakhon Phanom Province, Thailand.

Ecology: This species grows in a rocky and dense dry evergreen forest at an elevation of 170–240 m. It climbs on small to tall shrubs, trees or on big stones. Some plants grow along the river.

Vernacular name: เถากะไดลิง Thao Khadailing.

Etymology: Bauhinia nakhonphanomensis is named after the type locality Nakhon Phanom Province, the northeastern Thailand.

Figure 1. Bauhinia nakhonphanomensis A Habit B Habit and inflorescences C Large and old stems forming flattened “Monkey-Ladders” D Old (green) and young (pinkish) leaves E tendril F Inflorescence with many reddish bracteoles G Inflorescence with many reddish bracteoles and reddish-green floral buds.

   

Chatan, W. 2013. A New Species of Bauhinia L. (Caesalpinioideae, Leguminosae) from Nakhon Phanom Province, Thailand. PhytoKeys. 26: 1–5. doi: dx.doi.org/10.3897/phytokeys.26.6008


ABSTRACT
Bauhinia saksuwaniae, a new species from northeastern Thailand is described and illustrated. It appears to be an endemic and endangered species. The new species is obviously distinct from all other species of Thai Bauhinia in having large orbicular persistent bracteoles forming a cup-shape and enclosing a young floral bud.

 Sawai Mattapha, Pranom Chantaranothai and Somran Suddee. 2013. Bauhinia saksuwaniae sp. nov. (Leguminosae–Caesalpinioideae) from Thailand. Nordic Journal of Botany. 12/2013; DOI: 10.1111/j.1756-1051.2013.00102.x

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