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Field Mustard / RapeseedπΌ
Brassica rapa var. nippo-oleifera
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An annual/biennial in the mustard family, thought to originate from the Mediterranean to Western Asia. Long cultivated for rapeseed oil; now also grown as a landscape plant ('na-no-hana', rape blossoms) and a spring vegetable ('nabana'). The small 4-petaled yellow cruciform flowers cover fields in early spring, making the rape-blossom fields of Chiba and Mie tourist attractions. Naturalized individuals are common along rivers. Taxonomically contiguous with turnip, Chinese cabbage, and komatsuna.
Identification Points
- βYellow 4-petaled (cruciform) flowers in racemes
- βLower leaves pinnate; upper leaves clasping the stem
- β40β80 cm tall
Habitat
Cultivated (fields, landscape); riverbanks (naturalized)
Season
March to May (flowers)
Morphological TraitsAI-estimated, needs verification
Leaf arrangement
Alternate
Leaf type
Simple
Growth form
Herb
Petal count
4 petals
Flower color
Yellow
Flowering season
Spring
Habitat
Cultivated
Phylogenetic Positionγ’γγ©γη§ β
Phylogenetic Position
Angiosperms > Eudicots > Core eudicots > Brassicales > Brassicaceae
Divergence Era
Late Cretaceous to Paleogene
Sources & References
AI-generated, needs verification