Divaricarpa: Answers to key questions in Budd's Flora and Manual of Montana Vascular Plants leading to this species. 

	plants 20-80 cm high; NOT [plants 10-20 cm high]
	caudex usually simple or few-branched, not woody; NOT [caudex usually branched and woody]
	stems arising from terminal bud of the rosette; NOT [outer stems decumbent-based, arising from lateral buds, basal leaves erect]
	most stems > 1mm wide; NOT [stems <= 1 mm wide in the middle]
	pubescence of lower stems sparse and 2- to 3-branched; NOT [pubescence of lower stems more branched]
	NOT [basal leaves often blunt-tipped, felt-like with dense branched hairs]
	cauline leaves auriculate; NOT [cauline leaves without auricles]
	cauline leaves not rolled; NOT [margins of cauline leaves rolled under]
	cauline leaves not whitish-hairy; NOT [cauline leaves whitish with dense hair]
	at least some siliques spreading; NOT [all siliques erect or ascending], NOT [all siliques sharply reflexed and pendulous]
	siliques 5-10 cm long; NOT [siliques 1-5 cm long]
	siliques 1-2 mm wide, often > 1.5 mm wide; NOT [siliques 1.5-3.5 mm wide], NOT [siliques always <= 1.5 mm wide]

Arabis: Answers to key questions in Budd's Flora and Manual of Montana Vascular Plants leading to this genus. 

	basal leaves entire to shallowly dentate; NOT [basal leaves deeply lobed or divided into leaflets]
	plants with pubescence mostly or entirely of branched hairs; NOT [plants glabrous, or the pubescence of simple hairs]
	flowers much smaller; NOT [flowers 20-25 mm across]
	silique not samara-like
	siliques linear to oblong, > 5 times as long as wide
	siliques flattened parallel to the septum; NOT [siliques flattened at right angles to septum]; NOT [siliques round or 4-angled in cross section]
	silique beakless, often with a short style at the tip <= 1 mm long; NOT [silique with a large, usually seedless (sometimes 1-seeded), beak-like, upper portion and a seed-bearing lower portion]
	central partition entire; NOT [central partition with an opening sometimes almost reduced to the margin]
	silique with more than one seed; NOT [silique 1-seeded]

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
	stamens 6, four long and two short
	ovary superior; NOT [ovary inferior]
	carpels 1 or 2