Brassica

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  1a. Upper stem leaves either shortly petiolate or sessile and then narrowed to the base
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    B. juncea

    2a. Siliques terete or subterete, 15–40 mm long, tipped by an indehiscent beak 5–10 mm long; fruiting pedicels ascending, mostly 10–15 mm long; plants usually glabrous
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    B. nigra

    2b. Siliques quadrangular, 10–25 mm long, tipped by an indehiscent beak 1–3 mm long 
 [Fig. 509]; fruiting pedicels erect to appressed, 2–5 mm long [Fig. 509]; plants usually hirsute-hispid in the lower portion
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  1b. Upper stem leaves sessile and auriculate-clasping the stem
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    B. oleracea

    3a. Petals (15–) 18–25 (–30) mm long; plants glabrous throughout; filaments all erect at base; sepals erect; indehiscent, apical beak of fruit (3–) 4–10 mm long, with (0–) 1 (–2) seeds
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    3b. Petals 6–14 mm long; plants sometimes sparsely pubescent near the base; filaments of lateral stamens curved at base; sepals ascending (rarely suberect); indehiscent, apical beak of fruit 7–15 mm long, with 0 (–1) seeds
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      B. rapa

      4a. Plants green; petals 6–10 (–11) mm long, pale yellow; apical beak of silique (8–) 10–15 mm long; seeds 1–1.8 mm long; open flowers of raceme at the same level as or overtopping the flower buds
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      B. napus

      4b. Plants glaucous; petals 10–14 mm long, deep yellow; apical beak of silique 7–10 (–11) mm long; seeds (1.2–) 1.5–2.5 (–3) mm long; open flowers of raceme usually lower than (rarely at the same level) the flower buds

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 Show photos of:   Each photo represents one species in this genus.