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Keyed in multiple places:

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

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1 Flowers yellow.
..2 Trichomes sessile, medifixed; [tribe Erysimeae]
..2 Trichomes not sessile and medifixed.
....3 Leaves 2-3× pinnately dissected; [tribe Descurainieae]
......4 Cauline leaves not auricled; [tribe Alysseae]
......4 Cauline leaves auricled; [tribe Camelineae].
........5 Annual; petals yellow to pale yellow, fading whitish
........5 Perennial or biennial; petals creamy or pale yellow
1 Flowers white, pinkish, lavender, or blue.
..........6 Leaves only basal; [tribe Arabideae]
..........6 Leaves cauline (and often basal as well).
............ 7 Ovaries and young fruits not linear (instead pyriform, obovoid, obdeltoid, depressed globose, elliptic or otherwise not strictly linear throughout).
............ ..8 Cauline leaves sessile and auriculate; [tribe Camelineae].
............ ....9 Petals pale yellow, fading to whitish
............ ........11 Leaves 2-3× pinnately dissected; [tribe Descurainieae]
............ ..........12 Ovules 1-2 per ovary; plants usually canescent (bearing a fine grayish-white pubescence); [tribe Alysseae]
............ ..........12 Ovules 4 or more per ovary (2-10 in Lobularia); plants green, not obviously canescent (or only slightly in Lobularia).
............ ............ 13 Plants not scapose or with rosulate basal leaves, leaves cauline and usually abundant throughout the stems; larger plants often suffruticose; [tribe Malcolmieae]
............ ............ 13 Plants scapose, thus without cauline leaves (D. verna) OR strongly rosulate with well-spaced cauline leaves; plants herbaceous (D. ramosissima); [tribe Arabideae]
............ 7 Ovaries and young fruits linear.
............ ............ ....15 Young fruits ascending to descending; [tribe Boechereae]
............ ............ ......16 Stems pubescent or less commonly glabrous above, not glaucous; [tribe Arabideae]
............ ............ ........17 Stigmas 2-lobed, petals > 15 mm long; [tribe Hesperideae]
............ ............ ........17 Stigmas entire, petals < 6 mm long.
............ ............ ............ ..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

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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 amplexicaulous.
......4 Fruits narrowly pyriform to pyriform or broadly obovoid
..........6 Fruits with 1-2 seeds
............ 7 Plants canescent (grayish-green pubescent) throughout; plants herbaceous
............ 7 Plants green, not canescent throughout (sometimes sparsely pubescent, especially distally, but not uniformly canescent); larger plants often suffruticose
..........6 Fruits with 4 or more seeds.
............ ..8 Seeds winged or margined
............ ..8 Seeds without differentiated margin
............ ....9 Plants with basal leaves strongly rosulate
............ ....9 Plants without strong basal leaf rosette, instead leaves cauline
1 Fruits siliques (> 3× as long as wide).
............ ......10 Plant with some cauline leaves.
............ ............ 13 Siliques straight, slightly ascending to strictly erect or appressed; seeds 0.6-1.7 mm long; basal leaves < 8 cm long
............ ............ 13 Siliques curved or straight, ascending to descending, seeds either <1mm long or < 2.5 mm long, basal leaves 2.5-20 cm long
............ ............ ..14 Trichomes not sessile and medifixed.
............ ............ ......16 Stigmas entire and capitate, rarely slightly 2-lobed.
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