Panax japonicus It is Herbs, 50-80(-100) cm tall. Rootstock horizontal, flagellate or moniliform. Stem straight, glabrous. Leaves 3-5, verticillate at apex of stem, palmately compound; petiole base without stipule or stipulelike appendages; leaflets 5, obovate-elliptic to narrowly elliptic, 5-18 × 2-6.5 cm, membranous, both surfaces sparsely setose on veins, base broadly cuneate to subrounded, margin serrulate or biserrate, apex acuminate or long acuminate. Inflorescence a solitary, terminal umbel 50-80(or more)-flowered; peduncle 12-21 cm, glabrous or slightly pubescent; pedicels 7-12 mm. Filaments shorter than petals.

Panajaponin, a new glycosphingolipid compound (1), together with eight known compounds, 28-glu-oleanolic acid ester (2), chikusetsusaponin IVa (3), chikusetsusaponin IV (4), ginsenoside Ro (5), ginsenoside Re (6), notoginsenoside R2 (7), ginsenoside Rg2 (8) and adenosine (9), was isolated from Panax japonicus.