Brassica rapa |
Brassica nigra |
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common mustard, field mustard, wild turnip |
black mustard |
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Habit | Annual or biennial herb, glabrous or sparsely hairy with fleshy or slender roots. | |
Flowers | Flowers in small racemes terminally from leaf axils, with fruiting pedicels ascending to spreading, 10-25 mm. Sepals 4, green to yellow; petals 4, pale to deep yellow, 1 cm long; 6 stamens, 2 shorter than the others; superior ovary with one 2-carpellate pistil. |
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Fruits | Siliques up to 7cm long with s slender beaked tip. |
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Seeds | Black, brown or reddish in color, 1-2 mm in diameter. Seed coat is very finely reticulate to lightly alveolate. |
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Brassica rapa |
Brassica nigra |
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Flowering time | April-Septemeber | April-June |
Habitat | Roadsides, fields, ditches, wastelots and other disturbed open areas. | Fields, roadsides, wastelots, and other disturbed areas at low elevations. |
Distribution | Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.
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Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
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Origin | Introduced from Europe | Introduced from Europe |
Conservation status | Not of concern | Not of concern |
Sibling taxa | ||
Web links |
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