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Keyed in multiple places:

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Key to Borodinia

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1 Pedicels of fruits definitely deflexed; pedicels of flowers spreading (spreading or very slightly ascending in first few mm, then down-curved).
1 Pedicels of fruits erect or ascending; pedicels of flowers erect, ascending, spreading, or arching.
..2 Mature fruits < 4 cm long; stems branched or simple at the base.
....3 Stem leaves (most of them) < 5 mm wide; stems branched at the base
....3 Stem leaves (most of them) > 8 mm wide; stems simple at the base.
......4 Lower cauline leaves glabrous or sparsely pubescent on the upper surface; fruits erect and appressed, 3-5 cm long
......4 Lower cauline leaves hirsute or strigose on the upper surface; fruits widely ascending or spreading. 1.5-4 cm long.
........5 Petals 6-9 mm long; fruiting pedicels 10-16 mm long; mature fruits 2.5-4 cm long; pubescence of the lower leaf surface simple; seeds winged
........5 Petals 2-5 mm long; fruiting pedicels 2-10 (-13) mm long; mature fruits 1.5-3 cm long; pubescence of the leaf surface stellate; seeds wingless.
..........6 Petals 2-3 mm long, white to cream; fruiting pedicels 2-3.5 mm long; siliques 1.5-3 cm long; pubescence of the upper leaf surface simple
..........6 Petals 3-5 mm long, pink or purplish; fruiting pedicels 5-10 (-13) mm long; siliques 1.5-2 cm long; pubescence of the upper leaf surface stellate
..2 Mature fruits > 4 cm long; stems generally simple at the base.
............ 7 Fruits erect, appressed against the stem, the fruiting inflorescence < 2 cm in diameter.
............ ..8 Mature fruits terete, (4-) 7-9.5 cm long; basal leaves 5-12 cm long, stellate pubescent; cauline leaves 4-12 cm long; pubescence of the stem mostly of spreading, simple hairs
............ ..8 Mature fruits flat, 1.5-10 cm long; basal leaves 2-8 cm long, nearly glabrous; cauline leaves 1-4 cm long; pubescence of the stem mostly of appressed, forked hairs.
............ ....9 Mature fruits 4-10 cm long, 1.5-2.5 mm wide, with 2 rows of seeds in each locule
............ ....9 Mature fruits 1.5-7 cm long, 0.7-1.1 mm wide, with 1 row of seeds in each locule
............ 7 Fruits ascending to spreading (not erect and appressed to the stem), the fruiting inflorescence > 4 cm in diameter.
............ ......10 Cauline leaves not at all auricled or sagittate-clasping at the base.
............ ........11 Calyx 2.9-4.8 mm long; flowering Apr-May; plant unbranched or with 1-3 branches (sometimes more if the main stem damaged), the inflorescence thus a raceme or slightly paniculate; mature fruits 5.2-9.8 cm long; seeds 64-80 per silique; seeds with wing 0.2-0.5 mm wide
............ ........11 Calyx 2.0-3.3 mm long; flowering mid Jul-Sep; plant with numerous branches (well-developed plants usually with at least 10), the inflorescence thus a diffuse panicle; mature fruits 4.3-8.0 cm long; seeds 30-42 per silique; seeds with wing 0.1-0.2 mm wide
............ ..........12 Basal leaves subentire to serrate or sinuate-serrate; petals white, to 5 mm long, equaling or slightly surpassing the sepals; longest cauline leaves usually 8-18 cm long; plant glaucous
............ ..........12 Basal leaves sharply serrate-dentate to strongly laciniate or lyrate-pinnatifid; petals creamy-white, to 8 mm long, about 2× the length of the sepals; longest cauline leaves usually 3-5 cm long; plant green or red-tinged

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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