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| 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] |
| 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 |