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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
                       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]
                                         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 without differentiated margin
                 9 Plants without strong basal leaf rosette, instead leaves cauline
1 Fruits siliques (> 3× as long as wide).
                          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
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