| Family | ARISTOLOCHIACEAE |
| Genus species | Asarum megacalyx (F.Maek.) T.Sugaw. |
| Bibliography | Fl. Jap. [Iwatsuki & al., eds.] 2a: 383 (2006) |
| Native Range | Japan (Honshu) |
| Primary Biome | Temperate |
| Habitat | thickets and woods |
| Description | leaves long petiolate, ovate-sagittate or sagittate, 9-12cm long, acute, shiny, abaxially glabrous, perianth tubular-spherical, ca. 2cm, lobes patent, ovate |
| Size | 5-10cm |
| Color | purple |
| Bloom | early spring |
| Ca | |
| Type | perennial |
| Cultivation | cold, shady site with a humous, moist soil alpine house, moist, humous soil, shade |
| Propagation | seed when ripe or as soon as possible division in early and late summer |
| Synonyms | Heterotropa megacalyx F.Maek. |
| Territory | 3 Asia-Temperate 38 Eastern Asia (JAP Japan) |