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| Begonia gigang Mazo & Rubite, in Mazo et Rubite, 2025. |
Abstract
A new species of Begonia from Zamboanga del Norte, Mindanao Island, Philippines, is described. Begonia gigang is morphologically similar to Begonia corazoniae but can be distinguished by having smaller leaves which are hirsute on both surfaces, longer panicles and peduncles, shorter pedicels for both staminate and pistillate flowers, and trigonous-ellipsoid ovary. Begonia gigang is assessed as Endangered under the IUCN Red List Categories and Criteria. A detailed description, photographs, and ecological notes, and are provided.
Keywords: Begonia corazoniae, Begonia tinuyopensis, endangered, endemic, taxonomy
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| Begonia gigang Mazo & Rubite. A. Habit; B. Leaf adaxial surface; C. Leaf abaxial surface showing leaf margin; D. Stem and stipules; E. Staminate and pistillate flowers, inset 3-tepaled staminate flower; F. Cross-section of the ovary; G. Capsules. All from K. R. F. Mazo 112. |
Begonia gigang Mazo & Rubite, sp. nov.
Section Petermannia
Diagnosis: A species similar to Begonia corazoniae Naive (Naive et al. 2024) in having lamina with greenish to yellowish spots and variegations on the veins but differs in having smaller leaves (10.0–14.5 × 5–7 cm vs. up to 21 × 10.0–13.3 cm) which are hirsute on both surfaces (vs. glabrous), longer panicles and peduncles (15–23 cm vs. 8–13 cm; 9–12 cm vs. up to 4 cm), shorter pedicels for both staminate and pistillate flowers, and trigonous-ellipsoid ovary (vs. trapezoid to obovoid).
Etymology: The specific epithet is derived from the Subanen dialect refers to the rock formations where the new species was found.
Kean Roe F. Mazo and Rosario R. Rubite. 2025. Begonia gigang (section Petermannia: Begoniaceae), A New Species from Zamboanga Peninsula, Mindanao Island, Philippines. Webbia. Journal of Plant Taxonomy and Geography. 80(1); 89-94. DOI: doi.org/10.36253/jopt-17444 [2025-04-17]
