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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]
    3 Leaves not pinnately dissected.
      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
                 9 Petals wholly white
               8 Cauline leaves petiolate or sessile and not auriculate.
image of plant
Show caption*© Alan Cressler: Berteroa incana, Glacier Basin, Rocky Mountain National Park, Larimer County, Colorado 5 by Alan Cressler
                   10 Petal apices rounded, retuse, or emarginate.
                     11 Leaves 2-3× pinnately dissected; [tribe Descurainieae]
                     11 Leaves not pinnately dissected.
                       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 (D. ramosissima); plants herbaceous; [tribe Arabideae]
             7 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.
image of plant
Show caption*no rights reserved, uploaded by Guerric Haché
                                  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]