Flora of the Southeastern United States
2022 Edition

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Keyed in multiple places:

Key to Brassicaceae, Key B: plants in flower, trichomes of plant present with some or most or all branched

1
1
..2 Flowers yellow.
....3 Trichomes sessile, medifixed; [tribe Erysimeae]
....3 Trichomes not sessile and medifixed.
......4 Leaves 2-3× pinnately dissected; [tribe Descurainieae]
......4 Leaves not pinnately dissected.
........5 Cauline leaves not auricled; [tribe Alysseae]
........5 Cauline leaves auricled; [tribe Camelineae].
..........6 Annual; petals yellow to pale yellow, fading whitish
..........6 Perennial or biennial; petals creamy or pale yellow
..2 Flowers white, pinkish, lavender, or blue.
............ 7 Leaves only basal; [tribe Arabideae]
............ 7 Leaves cauline (and often basal as well).
............ ..8 Ovaries and young fruits not linear.
............ ....9 Cauline leaves sessile and auriculate; [tribe Camelineae].
............ ......10 Petals pale yellow, fading to whitish
............ ......10 Petals wholly white
............ ....9 Cauline leaves petiolate or sessile and not auriculate.
............ ........11 Petal apices strongly bifid; [tribe Alysseae]
............ ........11 Petal apices rounded, retuse, or emarginate.
............ ..........12 Leaves 2-3× pinnately dissected; [tribe Descurainieae]
............ ..........12 Leaves not pinnately dissected.
............ ............ 13 Ovules 1-2 per ovary; [tribe Alysseae]
............ ............ 13 Ovules 4 or more per ovary; [tribe Arabideae]
............ ..8 Ovaries and young fruits linear.
............ ............ ..14 Cauline leaves sessile and auriculate.
............ ............ ....15 Young fruits ascending to descending; [tribe Boechereae]
............ ............ ....15 Young fruits ascending to erect or appressed to rachis.
............ ............ ......16 Stems pubescent or less commonly glabrous above, not glaucous; [tribe Arabideae]
............ ............ ......16 Stems glabrous and glaucous above; [tribe Camelineae]
............ ............ ..14 Cauline leaves usually petiolate and if sessile, not auriculate.
............ ............ ........17 Stigmas 2-lobed, petals > 15 mm long; [tribe Hesperideae]
............ ............ ........17 Stigmas entire, petals < 6 mm long.
............ ............ ..........18 Leaves pinnately divided or lobed.
............ ............ ............ 19 Leaves lyrate pinnatifid; [tribe Camelineae]
............ ............ ............ 19 Leaves 2-3× pinnately dissected; [tribe Descurainieae]
............ ............ ..........18 Leaves entire or toothed.
............ ............ ............ ..20 Sepals 1-2.5 mm; of disturbed habitats; seeds uniseriate; [tribe Camelineae]
............ ............ ............ ..20 Sepals 0.7-1.2 mm or >2.5 mm; of disturbed and natural habitats; seeds biseriate; [tribe Arabideae]

Key to Brassicaceae, Key D: plants in fruit, trichomes of plant present with some or most or all branched

1 Fruits silicles (<3× as long as wide).
..2 Leaves basal only
..2 Plant with some cauline leaves.
....3 Cauline leaves sessile; blade bases auriculate, sagittate, or amplexicaule.
......4 Fruits obdeltoid
......4 Fruits narrowly pyriform to pyriform or broadly obovoid
....3 Cauline leaves petiolate or sessile and not auriculate.
........5 Leaves 2-3× pinnately dissected
........5 Leaves not pinnately dissected.
..........6 Fruits with 1-2 seeds
..........6 Fruits with 4 or more seeds.
............ 7 Seeds winged or margined
............ 7 Seeds without differentiated margin
1 Fruits siliques (> 3× as long as wide).
............ ..8 Leaves basal only
............ ..8 Plant with some cauline leaves.
............ ....9 Cauline leaves sessile; blade bases auriculate, sagittate, or amplexicaule.
............ ......10 Seeds biseriate
............ ......10 Seeds uniseriate.
............ ........11 Siliques straight, slightly ascending to strictly erect or appressed; seeds 0.6-1.7 mm long; basal leaves < 8 cm long
............ ........11 Siliques curved or straight, ascending to descending, seeds either <1mm long or < 2.5 mm long, basal leaves 2.5-20 cm long
............ ....9 Cauline leaves petiolate or sessile and not auriculate.
............ ..........12 Trichomes sessile, medafixed
............ ..........12 Trichomes not sessile and medafixed.
............ ............ 13 Leaves 2-3× pinnately dissected
............ ............ 13 Leaves not 2-3× pinnately dissected..
............ ............ ..14 Stigmas 2-lobed with lobes connivent and decurrent to erect
............ ............ ..14 Stigmas entire and capitate, rarely slightly 2-lobed.
............ ............ ....15 Seeds biseriate.
............ ............ ....15 Seeds unseriate