Monday, June 25, 2018

[Botany • 2018] Sindora stipitata (Detarioideae, Leguminosae) • A New Species from Northeastern Thailand


Sindora stipitata Chatan & Promprom

in Promprom, Chatan & Saisaard, 2018
มะค่าแต้นครพนม  ||  DOI:  10.3897/phytokeys.100.25870 

Abstract
Sindora stipitata, a new species in the subfamily Detarioideae (Leguminosae), collected from Nakhon Phanom Province, Thailand, is described and illustrated. The new species is morphologically similar to S. leiocarpa but differs in its smaller stature (3–5 m high), 6-foliolate paripinnate leaves, falcate persistent stipules, presence of a petal auricle, absence of a petal claw, stipitate ovary and capitate stigma. A key to the Thailand and Malesia species of Sindora is provided.

Keywords: Sindora, Fabaceae, Nakhon Phanom Province, plant diversity, Thailand, taxonomy


Figure 1. Sindora stipitata Chatan & Promprom, sp. nov.  A habit and habitat B branches and inflorescences C branch with leaves and stipules D branch with fruits.

 Photographs of the type specimen by W. Chatan. 

Figure 2. Line drawing of Sindora stipitata Chatan & Promprom, sp. nov. A a branch with leaves and inflorescence B floral bud C floret D posterior sepal (abaxial side) E posterior sepal (adaxial side) F one of the remaining narrower sepal (abaxial side) G one of the remaining narrower sepal (adaxial side) H petal (adaxial side) I free staminode J fused stamen K pistil.
Illustration by W. Chatan (based on type specimen).

Taxonomy
Sindora stipitata Chatan & Promprom, sp. nov.

Diagnosis: Sindora stipitata is very similar to S. leiocarpa from Malesia, but it is easily distinguished by the following characters: a smaller stature (3-5 m high), 6-foliolate paripinnate leaves, falcate persistent stipules, presence of a petal auricle, absence of a petal claw, stipitate ovary and capitate stigma.

Distribution: The new species is a Thai endemic and is known from only the type locality in the Phulangka National Park, Ban Pheang District, Nakhon Phanom Province, North-eastern Thailand.

Ecology: This new species grows in open areas of dry deciduous forest at an elevation of 250–350 m.


Etymology: The specific epithet refers to its distinctly long ovary stipe. This character is one of many morphological characters that distinguishes the new species from its closely related species.

Vernacular name: Ma Kha Tae Nakhon Phanom - มะค่าแต้นครพนม, Mak Tae.


Preliminary conservation status: Sindora stipitata is known only from the type locality and its estimated extent of occurrence is less than 100 km2. The number of mature individuals was less than 1,000 and the occupied area is continuing to decline slightly. Therefore, it should be considered as “Critically Endangered” according to the IUCN criteria B1 (IUCN 2017).


 Wilawan Promprom, Wannachai Chatan and Peerapon Saisaard. 2018. Sindora stipitata (Detarioideae, Leguminosae), A New Species from Thailand. PhytoKeys. 100: 149-156.  DOI:  10.3897/phytokeys.100.25870

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