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This species is accepted, and its native range is Thailand.

[KBu]

Suwanphakdee C et al. 2017. New species and a reinstatement in Peperomia (Piperaceae) from Thailand. Kew Bulletin 72:1. DOI 10.1007/S12225-016-9662-5

Conservation
This species is uncommon and only a few specimens have been collected from the border area between Loei and Khon Kaen provinces in northeastern Thailand. The populations are narrowly distributed in an area of karst lime­stone and not in a protected area. The populations are threatened by farming and deforestation. The status of Peperomia sirindhorniana is assessed as Critically Endangered (CR), according to IUCN (2011) criteria and the authors consider a category of B1b to be appropriate.
Distribution
Endemic to northeastern Thailand (Loei and Khon Kaen provinces).
Ecology
Peperomia sirindhorniana grows only in the shaded areas of limestone mountains at altitudes of 500 - 800 m.
Morphology General Habit
Annual herbs 10 - 30 cm high, erect, epilithic; stems red or reddish, forming a clump, 1 - 3 main stems with 2 - 4 branchlets; stolons present, fleshy, with adventitious roots on basal nodes; internodes 2 - 3 cm long, glabrescent
Morphology Leaves
Leaves alternate; petiole 1 - 1.5 cm long, red or reddish, glabrous or puberulous; lamina bright to dark green, fleshy when fresh and subcoriaceous when dry, ovate, broadly ovate or cordate, glabrous or glabrescent on both surfaces; 2 - 4x2- 3.5 cm, symmetric or asymmetric, base truncate or rounded, apex acute, margin undulate with short hairs, leaf 3 - 5-palmatinerved, rarely pinnate, 2-paired; petioles 1 - 1.5 cm long, red or reddish, glabrous or puberulous
Morphology Reproductive morphology Flowers
Flower with orbicular floral bract, 0.5 - 0.8 mm, covering the basal part of ovary
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens: filaments 0.2 - 0.3 mm long; anthers 0.1 - 0.2 mm long, exserted at anthesis
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary ovoid; style short, stigma capitate, pubescent
Morphology Reproductive morphology Fruits
Fruit without a pseudopedicel, ovoid, 0.8 - 1 mm diam., immersed within rachial pit, apex acute with persistent style, densely acute sticky papillae on fruit surface
Morphology Reproductive morphology Inflorescences
Inflorescence a single spike or a fasicle with 2 - 4 spikes per shoot, a long stem or in the axils of upper leaves, 5 - 15 x 0.1 - 0.15 cm, erect, greenish-yellow, cylindrical; rachis glabrous, with sparse flowers; peduncles 1 - 2 cm long, red, glabrous
Note
Peperomia sirindhorniana is most similar to P. pellucida but can be distinguished by growing only on limestone vs being a generalist; stolonifer- ous stems vs without; red or reddish stems and petioles vs pale green; bright to dark green leaves vs pale green; glabrescent in all parts vs glabrous; leaves fleshy when fresh and subcoriaceous when dry vs thinly papery; fruit ovoid with an acute apex vs ±globose; persistent style vs without; acute papillae on their surface vs rounded papillae; fruit beaked vs rounded. We discovered some unidentified specimens (T. Smitinand & H. Sleumer 1131 in BKF and L that were collected from Pha Nok Khao, Khon Kaen province, northeastern Thailand. They are similar to Peperomia pellucida in gross morphology but differ in some characters. We have subsequently collected living specimens from a nearby locality and they are easily recognised as a species new to science. The distinguishing characteristics of P. sirindhorniana are its red or reddish petioles and stems, and its bright to dark green leaves when fresh (subcoriaceous when dry) as opposed to pale green (membranous when dried) in P. pellucida. Furthermore, its fruits are larger than P. pellucida and are ovoid with a beaked apex formed from the style and it has densely acute papillae on the fruit surface. The differences between P. sirindhorniana and P. pellucida are summarised in Table 4. The specific epithet honours to Her Royal Highness Princess Maha Chakri Sirindhorn Mahidol who initiated the Plant Genetic Conservation Project to develop the personnel and plant genetics resources for the maintenance of plant varieties, and for the development to be advantageous for farmers and the business sector of Thailand.
Phenology
Flowering and fruiting occur between August and December.
Vernacular
Rak-Ta-Nil.

Native to:

Thailand

Peperomia sirindhorniana Suwanph. & Chantar. appears in other Kew resources:

First published in Kew Bull. 72(1)-1: 7 (2016)

Accepted by

  • Govaerts, R., Nic Lughadha, E., Black, N., Turner, R. & Paton, A. (2021). The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. https://doi.org/10.1038/s41597-021-00997-6 Scientific Data 8: 215.

Literature

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Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Bulletin
Kew Bulletin
http://creativecommons.org/licenses/by-nc-sa/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0