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Issue: Vol. 641 No. 4: 21 Mar. 2024
Type: Article
Published: 2024-03-21
DOI: 10.11646/phytotaxa.641.4.4
Page range: 277-285
Abstract views: 279
PDF downloaded: 15

A new Begonia species (sect. Baryandra, Begoniaceae) from Batangas Province, Luzon Island, Philippines

Biodiversity Program, Taiwan International Graduate Program, Academia Sinica, Taipei, 115201, Taiwan. Department of Life Science, National Taiwan Normal University, Taipei 116059, Taiwan. Research Museum and Herbarium (HAST), Biodiversity Research Center, Academia Sinica, Taipei 115201, Taiwan.
Biodiversity Program, Taiwan International Graduate Program, Academia Sinica, Taipei, 115201, Taiwan. Department of Life Science, National Taiwan Normal University, Taipei 116059, Taiwan. Research Museum and Herbarium (HAST), Biodiversity Research Center, Academia Sinica, Taipei 115201, Taiwan. Philippine National Herbarium, Botany and National Herbarium Division, National Museum of Natural History, National Museum of the Philippines, T.M. Kalaw St., Ermita Manila 1000, Philippines.
University of the Philippines Manila, Department of Biology, College of Arts and Sciences, Padre Faura, Manila, Philippines
City Government of Tanauan, New City Hall, Barangay Natatas, Tanauan City, Batangas 4232, Philippines
Research Museum and Herbarium (HAST), Biodiversity Research Center, Academia Sinica, Taipei 115201, Taiwan
Begonia amparoae critically endangered Taal Volcano Tanauan City Eudicots

Abstract

Begonia tanauanensis is a newly described endemic species in B. sect. Baryandra from Tanauan City, Batangas, southern Luzon, Philippines. Morphological data shows this species resembles B. chingipengii, a species from eastern Luzon as both species have light pink flowers, fleshy green lamina, and boat-shaped bracts. However, B. tanauanensis does not have the prominent white midrib and veins in the adaxial leaf surface, ciliate hairs on leaf margin, strongly keeled stipules and tomentose hairs on the abaxial leaf surface and petioles of B. chingipengii. The plants were observed to have a restricted and severely fragmented distribution. Unfortunately, these observed populations are also affected by human activities and threat of volcanic activity of the nearby Taal Volcano. Because of these threats, we provisionally assess the species as “Critically Endangered” (CR) following the IUCN Red List Categories and Criteria.

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