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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]  Erysimum

2 Trichomes not sessile and medifixed.

3 Leaves 2-3× pinnately dissected; [tribe Descurainieae]  Descurainia

3 Leaves not pinnately dissected.

4 Cauline leaves not auricled; [tribe Alysseae]  Alyssum

4 Cauline leaves auricled; [tribe Camelineae].

5 Annual; petals yellow to pale yellow, fading whitish  Camelina

5 Perennial or biennial; petals creamy or pale yellow  Turritis glabra

1 Flowers white, pinkish, lavender, or blue.

6 Leaves only basal; [tribe Arabideae]  Draba

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  Camelina

9 Petals wholly white  Capsella bursa-pastoris

8 Cauline leaves petiolate or sessile and not auriculate.

Show caption*© Alan Cressler: Berteroa incana, Glacier Basin, Rocky Mountain National Park, Larimer County, Colorado 5 by Alan Cressler                    10 Petal apices strongly bifid; [tribe Alysseae]  Berteroa incana

10 Petal apices rounded, retuse, or emarginate.

11 Leaves 2-3× pinnately dissected; [tribe Descurainieae]  Descurainia

11 Leaves not pinnately dissected.

12 Ovules 1-2 per ovary; plants usually canescent (bearing a fine grayish-white pubescence); [tribe Alysseae]  Alyssum

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]  Lobularia maritima

13 Plants scapose, thus without cauline leaves (D. verna) OR strongly rosulate with well-spaced cauline leaves; plants herbaceous (D. ramosissima); [tribe Arabideae]  Draba

7 Ovaries and young fruits linear.

14 Cauline leaves sessile and auriculate.

15 Young fruits ascending to descending; [tribe Boechereae]  Borodinia

15 Young fruits ascending to erect or appressed to rachis.

16 Stems pubescent or less commonly glabrous above, not glaucous; [tribe Arabideae]  Arabis

16 Stems glabrous and glaucous above; [tribe Camelineae]  Turritis glabra

14 Cauline leaves usually petiolate and if sessile, not auriculate.

Show caption*no rights reserved, uploaded by Guerric Haché                                   17 Stigmas 2-lobed, petals > 15 mm long; [tribe Hesperideae]  Hesperis matronalis

17 Stigmas entire, petals < 6 mm long.

18 Leaves pinnately divided or lobed.

19 Leaves lyrate pinnatifid; [tribe Camelineae]  Arabidopsis

19 Leaves 2-3× pinnately dissected; [tribe Descurainieae]  Descurainia

18 Leaves entire or toothed.

20 Sepals 1-2.5 mm; of disturbed habitats; seeds uniseriate; [tribe Camelineae]  Arabidopsis

20 Sepals 0.7-1.2 mm or >2.5 mm; of disturbed and natural habitats; seeds biseriate; [tribe Arabideae]  Draba