Image: Wikimedia Commons (See link for license)
Japanese HorseradishπΏ
Wasabia japonica
γ―γ΅γ
A perennial herb endemic to Japan, growing naturally along clear mountain streams. The green pungent compound (allyl isothiocyanate) obtained by grating the rhizome is an indispensable condiment for sushi and sashimi. Main production areas include Shimane and Shizuoka (Amagi, Oigawa). Cultivation methods include water-grown wasabi (sawa-wasabi) and field-grown wasabi (oka-wasabi).
Identification Points
- βSmall white 4-petaled flowers bloom in spring (typical of Brassicaceae)
- βLeaves are large and heart-shaped with wavy serrate margins
- βRhizome is green, cylindrical, with spongy tissue
- βGrows on rocks in clear streams and in wetlands
- βStrong pungency and distinctive aroma
Habitat
Along clear mountain streams and wetlands; prefers cool running-water environments
Season
MarchβMay (flowering), year-round (rhizome harvest)
Morphological TraitsAI-estimated, needs verification
Leaf arrangement
Alternate
Leaf type
Simple
Venation
Pinnate
Leaf margin
Serrate
Leaf shape
Cordate
Growth form
Herb
Petal count
4 petals
Petal fusion
Free
Habitat
Cultivated
Phylogenetic Positionγ’γγ©γη§ β
Phylogenetic Position
Angiosperms > Eudicots > Core eudicots > Brassicales > Brassicaceae
Divergence Era
Late Cretaceous to Paleogene
Evolution Notes
The pungent compounds (glucosinolates) of Brassicaceae evolved as secondary metabolites to defend against insect herbivory. Wasabi contains these at particularly high concentrations.
View on evolution timeline βSources & References
AI-generated, needs verification