Group 9

1	Abaxial surface of leaf blades usually with simple and/or 2-rayed trichomes, rarely glabrous		(2)
+	Abaxial surface of leaf blades with simple and 2-6-rayed trichomes, sometimes subdendritic and up to 12-rayed		(8)
2 (1)	Sepals persistent		(3)
+	Sepals caducous		(4)
3 (2)	Petals yellow, 3.5-5 × 1.5-2 mm; styles 0.4-1 mm; fruiting pedicels 3-7 mm; fruits 2.5-5 mm wide, flattened.		58 Draba longisquamosa
+	Petals white, 1.5-2 × 0.5-0.6 mm; styles 0.1-0.2 mm; fruiting pedicels 1-2.5(-4) mm; fruits (1.2-)1.5-2.5 mm wide, slightly inflated basally.		64 Draba monoensis (in part)
4 (2)	Abaxial surface of leaf blades glabrous, midvein prominent; plants pulvinate.		35 Draba densifolia (in part)
+	Abaxial surface of leaf blades usually pubescent, sometimes glabrous (D. cyclomorpha), midvein usually obscure (except D. subcapitata); plants often not pulvinate		(5)
5 (4)	Petals 1.4-4 × 0.5-1 mm; racemes 1-8 (or 9)-flowered, not or slightly elongated in fruit; Alaska, Canada, Greenland		(6)
+	Petals 4-6 × 1.5-2.5 mm; racemes 4-15(-21)-flowered, elongated in fruit; California, Oregon		(7)
6 (5)	Petals yellow or yellowish green, linear-oblanceolate, 3-4 × 0.5-0.8 mm; leaf blades each with midvein usually obscured; ovules 4-8 per ovary; Alaska.		3 Draba aleutica
+	Petals white or creamy white, spatulate, 1.5-2(-2.5) × 0.7-1 mm; leaf blades each with midvein strongly thickened; ovules 14-24 per ovary; Alaska, Greenland, Northwest Territories, Nunavut, Quebec.		113 Draba subcapitata (in part)
7 (5)	Fruits plane, valves glabrous; fruiting pedicels softly pilose; ovules 8-12 per ovary; seeds 1.4-1.9 × 1-1.2 mm; ne Oregon.		33 Draba cyclomorpha
+	Fruits slightly twisted, valves pubescent; fruiting pedicels hirsute; ovules 10-16 per ovary; seeds 1-1.4 × 0.6-1 mm; ec California.		56 Draba lemmonii
8 (1)	Racemes not or slightly elongated (sometimes subumbellate) in fruit		(9)
+	Racemes elongated in fruit		(13)
9 (8)	Abaxial surface of leaf blades with 2-5-rayed trichomes; fruit valves glabrous; petals 1-2 mm wide.		59 Draba macounii (in part)
+	Abaxial surface of leaf blades with some simple trichomes; fruit valves pubescent or puberulent (sometimes glabrous in D. stenopetala and D. subcapitata); petals 0.3-1.5 mm wide		(10)
10 (9)	Basal leaves densely imbricate; fruits 3-6 mm, inflated (at least basally)		(11)
+	Basal leaves not imbricate; fruits 5-10 mm, flattened		(12)
11 (10)	Petals usually yellow, rarely purple, linear, 2.5-5 × 0.3-0.7 mm; ovules 4-10 per ovary.		109 Draba stenopetala (in part)
+	Petals white or creamy white, spatulate, 1.5-2(-2.5) × 0.7-1 mm; ovules 14-24 per ovary.		113 Draba subcapitata (in part)
12 (10)	Fruits ovate-elliptic, 2-3.2 mm wide, valves often densely pubescent; ovules (16-)18-28 per ovary; leaf blades with apices obtuse to rounded, surfaces with subcruciform trichomes.		62 Draba micropetala (in part)
+	Fruits obovate, (3-)3.5-5 mm wide, valves often glabrate; ovules 8-16 (-20) per ovary; leaf blades with apices acute or subacute, surfaces with simple and/or 2-branched trichomes.		77 Draba pauciflora
13 (8)	Plants stoloniferous; basal leaves not rosulate; fruit valves glabrous.		72 Draba ogilviensis (in part)
+	Plants cespitose, not stoloniferous; basal leaves rosulate; fruit valves pubescent or glabrous		(14)
14 (13)	Petals linear, 0.3-0.7 mm wide; fruits inflated basally; ovules 4-10 per ovary.		109 Draba stenopetala (in part)
+	Petals obovate, spatulate, or narrowly oblanceolate, (0.7-)1-4.6 mm wide; fruits flattened; ovules 12-36 per ovary		(15)
15 (14)	Petals white; fruit valves pubescent, trichomes 2-5-rayed; stigmas distinctly wider than styles; abaxial surface of leaf blades with some 6-12-rayed trichomes		(16)
+	Petals pale or bright yellow (sometimes creamy white in D. oxycarpa); fruit valves usually pubescent, sometimes glabrous, trichomes simple, spurred, or 2-rayed; stigmas about as wide as styles; abaxial surface of leaf blades with 2-5-rayed trichomes (rays sometimes spurred in D. oxycarpa)		(17)
16 (15)	Fruits with 2-4-rayed and, sometimes, simple trichomes; petals 3-4 mm; stems proximally with branched trichomes 2-6-rayed.		8 Draba arctogena (in part)
+	Fruits with (2-)5-12-rayed trichomes; petals 3.5-5 mm; stems proximally with branched trichomes 4-10-rayed.		71 Draba oblongata (in part)
17 (15)	Fruiting pedicels 1-3(-4) mm; petals 2-3 × (0.7-)1-1.5 mm; styles 0.05- 0.3 mm; racemes slightly elongated in fruit.		62 Draba micropetala (in part)
+	Fruiting pedicels (2.5-)4-13(-30) mm; petals 3.5-6 × 1.7-4.6 mm; styles (0.1-)0.2-0.9 mm; racemes often considerably elongated in fruit		(18)
18 (17)	Basal leaf blades linear to linear-oblanceolate, 1-2.5(-4) mm wide, midveins prominent.		84 Draba pilosa (in part)
+	Basal leaf blades oblong, lanceolate, oblanceolate, or obovate, 2-9 mm wide, midveins obscure		(19)
19 (18)	Petals 1.7-2.5 mm wide; sepals purplish tinged; fruits elliptic; abaxial surface of leaf blades with 2-4-rayed trichomes; seeds pale brown.		4 Draba alpina
+	Petals 2.5-4.6 mm wide; sepals gray-green; fruits ovate, ovate-oblong, or lanceolate; abaxial surface of leaf blades with 2-5-rayed and subdendritic trichomes; seeds dark brown or black		(20)
20 (19)	Basal leaf blade margins usually denticulate; fruits ovate to ovate-oblong, 3-5 mm wide; styles 0.2-0.6 mm; Greenland.		75 Draba oxycarpa (in part)
+	Basal leaf blade margins entire; fruits lanceolate, 2.3-3.8 mm wide; styles 0.1-0.3 mm; Canada.		101 Draba simmonsii