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Issue: Vol. 681 No. 1: 8 Jan. 2025
Type: Article
Published: 2025-01-08
DOI: 10.11646/phytotaxa.681.1.8
Page range: 102-108
Abstract views: 144
PDF downloaded: 9

Morpho-anatomical description of new Begonia species (sect. Baryandra, Begoniaceae) from Butuan City, Mindanao 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.
Research Museum and Herbarium (HAST), Biodiversity Research Center, Academia Sinica, Taipei 115201, Taiwan
University of the Philippines Manila, Department of Biology, College of Arts and Sciences, Padre Faura, Manila, Philippines
Research Museum and Herbarium (HAST), Biodiversity Research Center, Academia Sinica, Taipei 115201, Taiwan
archipelago Begoniaceae big genera Pleistocene Aggregate Island Complexes Eudicots

Abstract

Begonia butuanensis, a new species of Begonia sect. Baryandra endemic in northeastern Mindanao is described. We compared it to another species endemic to southern Mindanao, B. copelandii. Both species have ciliate leaf margins, rounded outer tepals, and lanceolate inner tepals of staminate flowers. However, B. butuanensis is distinct in its smaller perianth size, triangular capsule lateral wing with subfalcate apex (vs. rectangular with subacute to truncate apex in B. copelandii), puberulous peduncles (vs. glabrous), and orbicular to slightly ovate lamina with rounded to obtuse apices (vs. ovate to orbicular lamina with obtuse to acuminate apex). The species is observed only from the type locality, and we recommend the species to be listed as Critically Endangered (CR) following the 2024 IUCN guidelines.

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