| Family | Begoniaceae |
| Scientific name | Begonia formosana (Hayata) Masamune |
| Synonyms | Begonia formosana (Hayata) Masamune forma albomaculata Liu & Lai; Begonia laciniata Roxburgh var. formosana Hayata; Begonia tarokoensis M. J. Lai |
| Common name | (Japanese common name) maruyama-shu-kaido (マルヤマシュウカイドウ, 丸山秋海棠 [meaning: Maruyama's shu-kaido (shu-kaido = Begonia grandis)]) |
| (English common name) none | |
| Distribution | (Japan) Okinawa |
| (Other nations) Taiwan | |
| Habitat | Forest, forest edge |
| Chromosomal number | 2n=60, 64 |
| Description | Plants 40-80cm tall. Flowers white or pink petals ca. 15mm long, flowering in all seasons. Perennial plants. |
| Reference | Begonia formosana (Hayata) Masam. |
| Begonia formosana (Hayata) Masam. | |
| Begonia formosana (Hayata) Masam. | |
| Foliar Flavonoids from Two Begonia Species in Japan | |
| Karyomorphology of Taiwanese Begonia (Begoniaceae): taxonomic implications |
| October 2009 at Tsukuba Botanical Garden |
October 2009 at Tsukuba Botanical Garden |
| October 2009 at Tsukuba Botanical Garden |