Abstract
Begonia polyclada, a new species of sect. Petermannia from Luzon, Philippines is here described and illustrated. The new species is apparently allied to a group of Begonia in the Philippines with axillary inflorescences and numerous, relatively small-sized sub-symmetric, ovate to lanceolate-ovate leaves, i.e. B. aequata A. Gray (1854: 658), B. binuangensis Merr. (1918: 40), B. edanoi Merr. (1918: 314), B. gracilipes Merr. (1912: 405), B. lagunensis Elmer (1910: 735), B. sarmentosa L.B. Sm. & Wassh. (1983: 443) and B. wenzelii Merr. (1915: 277). However, a combination of characters such as the much smaller, nearly sessile leaves, tomentose stem, petiole and leaf abaxial surface, and an erect habit readily distinguish the new species from them.
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