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| Begonia quadricornualata R.Maity, U.L.Tiwari & S.S.Dash, in Maity, Tiwari et Dash, 2026. |
Abstract
A new species of Begonia L. (Begoniaceae) belonging to sect. Platycentrum is described from the Papum Pare District of Arunachal Pradesh, India. This new species is distinguished by its dense, long, red to brown hispid hairs on the adaxial leaf surface of female plants, caducous stipules and bracts, and solitary-flowered female inflorescence. Additionally, it features dense, woolly brown ovaries and fruits, the latter bearing four fully developed wings. This paper includes a detailed description, photographic plate, line drawings, a comparative morphological table and a dichotomous key to distinguish the new taxon from closely allied species.
Keywords: Arunachal Pradesh, Begonia sect Platycentrum, Eastern Himalaya, four-horned begonia, northeast India
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| Begonia quadricornualata sp. nov. (female plant). (A) General habit, (B) leaf showing red hispid hairs, (C) habit showing open female flower, (D) habit showing position of female inflorescence from side view, (E) bracts, (F) outer tepal, (G) inner tepal, (H) gynoecium, (I) fruit, (J) T.S. of fruit. |
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| Illustration of Begonia quadricornualata sp. nov. female plant (A) Habit, (B) bract, (C) outer tepal, (D) inner tepal, (E) gynoecium, (F) fruit. male plant (A) Habit, (B) inflorescence, (C) male flower, (D) bract, (E) outer tepal, (F) inner tepal, (G) stamen. Drawings by D. K. Sah. |
Begonia quadricornualata R.Maity, U.L.Tiwari & S.S.Dash sp. nov.
Diagnosis: A species morphologically allied to B. handelii Irmsch. and B. tessaricarpa C.B.Clarke, but distinguished by its dense, long, red to brown hispid hairs on the adaxial leaf surfaces of female plants (versus glabrescent in B. handelii, and puberulous in B. tessaricarpa), and its significantly longer petioles, measuring 40–50 cm (versus up to 25 cm in B. handelii and 14–31 cm in B. tessaricarpa). It is further characterized by caducous stipules and bracts (versus persistent in both B. handelii and B. tessaricarpa) and male flowers with 40–60 stamens (versus 70–100 in B. handelii, and 12–20 in B. tessaricarpa). Additionally, female inflorescences are solitary-flowered (versus 2–4-flowered in B. handelii and 2–5-flowered in B. tessaricarpa) and the fruit is 4-winged (versus 4-ridged in B. handelii, and 4-horned in B. tessaricarpa).
Etymology: The specific epithet ‘quadricornualata' refers to the unique development of the four ovary horns into four distinct wings on the fruit. The name is derived from the Latin ‘quattuor' (four), ‘cornu' (horn), and ‘alatus' (winged).
Rohan Maity, Umeshkumar L. Tiwari and Sudhansu Sekhar Dash. 2026. Begonia quadricornualata sp. nov. (Begoniaceae) from India. Nordic Journal of Botany. DOI: doi.org/10.1002/njb.05000 [07 July 2026]
