Berteroa: Answers to key questions in Budd's Flora and Flora of Alberta leading to this genus. 

	plants of lowland habitats; NOT [plants of alpine habitats]
	stem generally branched; NOT [stem unbranched]
	stem leafy; NOT [stem leafless]
	plants pubescent; NOT [plants glabrous]
	basal leaves 1-4 cm long; NOT [basal leaves 1-4 dm long]
	basal leaves entire to denticulate; NOT [basal leaves irregularly crenate]
	cauline leaves not auriculate
	cauline leaves not clasping
	petals bilobed; NOT [petals entire]
	petals white; NOT [petals yellow]
	style 2-3 mm long; NOT [style 1 mm long]
	fruit generally more than 5 mm long; NOT [fruit less than 5 mm long]
	pods flattened parallel to septum, if at all; NOT [pods flattened at right angles to septum]
	fruit 2-3 times longer than broad or shorter; NOT [fruit much longer than broad]
	fruit not triangular
	pods short, oblong; NOT [pods almost circular, with flat margins]
	fruit wingless; NOT [fruit sometimes winged]
	valves convex; NOT [valves flat] (FOA)
	pods flattened; NOT [pods subglobose] (BF)
	seeds few in each cell of pod; NOT [seeds many in each cell of pod]

Cruciferae: Answers to key questions in Budd's Flora leading to this family. 

	herbs; NOT [shrubs or trees]
	plants terrestrial or semiaquatic; NOT [plants aquatic, leaves submerged or floating]
	plants not with colored milky juice
	plants with more than one normal leaf
	some or all leaves alternate; NOT [leaves opposite, whorled, or basal]
	leaves without stipules, or having glands; NOT [leaves with stipules]
	flowers with two floral rings
	calyx regular; NOT [calyx irregular, some sepals smaller than others]
	sepals 4
	corolla regular in shape; NOT [corolla irregular in shape]
	each petal distinct from the others
	petals 4; NOT [petals 5]
	stamens 6, four long and two short
	ovary superior; NOT [ovary inferior]
	carpels 1 or 2; NOT [carpels 3-5]