| Family | Phrymaceae |
| Scientific name | Phryma leptostachya L. var. oblongifolia (Koidzumi) Honda |
| Synonyms | Phryma leptostachya L. subsp. asiatica (H. Hara) Kitamura forma oblongifolia (Koidzumi) Ohwi; Phryma leptostachya L. var. asiatica (H. Hara) Kitamura forma oblongifolia (Koidzumi) Honda; Phryma leptostachya L. var. oblongifolia (Koidzumi) Honda; Phryma oblongifolia Koidzumi |
| Common name | (Japanese common name) nagaba-hae-dokuso (ナガバハエドクソウ, 長葉蠅毒草 [meaning: long leaved fly poison weed]) |
| (English common name) none | |
| Distribution | (Japan) Honshu, Shikoku, Kyushu |
| (Other nations) unknown | |
| Habitat | Forest |
| Chromosomal number | 2n=28 |
| Description | Plants 40-60cm tall. Flowers 6mm, flowering in May to July. Perennial plants. |
| Reference | Phryma leptostachya L. var. oblongifolia (Koidz.) Honda |
| Phryma leptostachya Linn. |
| June 2007 at lowland forest edge |
June 2007 at lowland forest edge |
May 2007 at Institute for Nature Study |
| June 2007 at lowland forest edge |
June 2007 at lowland forest edge |