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Keyed in multiple places:

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Key to Rhamphospermum

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1 Seeds 1.0-1.5 mm long, smooth
1 Seeds 1.5-2.0 mm long, minutely roughened-reticulate

Key to Sinapis

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1 Beak of silique strongly compressed; silique densely covered with long, stiff trichomes, ca. 4 mm in diameter; pedicels slender, mostly at right angles to the rachis; seeds 4-8 per silique
1 Beak of silique conical; silique glabrous or nearly so, ca. 2 mm in diameter; pedicels thick, erect to spreading; seeds 7-13 per silique