1	"Annual or biennial"	2
1	"Perennial herb"	8
2	"Petals deeply 2-lobed; inflorescence axis generally wavy in fruit"	"Draba verna"
2	"Petals not divided; inflorescence axis straight in fruit"	3
3	"Style (0.8)1--3.5 mm"	"Draba corrugata"
3	"Style <= 0.4 mm"	4
4	"Inflorescence umbel-like in fruit"	"Draba reptans"
4	"Inflorescence elongated to +- congested, not umbel-like in fruit"	5
5	"Inflorescence axis glabrous"	6
5	"Inflorescence axis hairy"	7
6	"Cauline leaves (0)1--5; pedicels 3--14 mm, <= fruit"	"Draba albertina"
6	"Cauline leaves 4--12(15); pedicels 7--28(35) mm, > fruit"	"Draba nemorosa"
7	"Basal leaves not rosetted, late-season flowers without petals; seeds 0.5--0.7 mm, ovoid"	"Draba cuneifolia"
7	"Basal leaves rosetted, late-season flowers with petals; seeds 0.8--1.1 mm, oblong"	"Draba praealta"
8	"Basal leaves abaxially glabrous (leaf margins hairy)"	9
8	"Basal leaves abaxially hairy"	13
9	"Style (1)1.6--3 mm"	10
9	"Style 0.1--0.8 mm"	11
10	"Fruit glabrous; seed 3--4.5 mm wide, round, winged"	"Draba carnosula"
10	"Fruit hairy; seed 1--1.6 mm, oblong, wingless"	"Draba howellii"
11	"Plant cushion-forming; leaf midvein prominent"	"Draba densifolia"
11	"Pl. not cushion-forming; leaf midvein obscure"	12
12	"Pedicel base not decurrent; fruit 1.5--3 mm wide, narrowly lanceolate"	"Draba cruciata"
12	"Pedicel base decurrent; fruit 2.2--4.5 mm wide, ovate to lance-elliptic"	"Draba incrassata"
13	"Plant cushion-forming; flowers yellow; cauline leaves 0"	14
13	"Plant not cushion-forming; flowers white (yellow); cauline leaves (0)1--many"	19
14	"Style 1.5--3.8 mm; seeds winged"	"Draba pterosperma"
14	"Style 0.1--0.8(1) mm; seeds wingless"	15
15	"Leaf hairs sessile, comb-like, 7--16-rayed, long axis parallel to midvein"	"Draba oligosperma"
15	"Leaf hairs stalked, not comb-like, 2--12-rayed, long axis not parallel to midvein"	16
16	"Fruit not symmetric, flat, generally twisted"	"Draba sierrae"
16	"Fruit symmetric, flat or base inflated, not twisted"	17
17	"Leaves abaxially sparsely hairy, hairs 2--4-rayed; fruit flat"	"Draba densifolia"
17	"Leaves abaxially densely hairy, hairs 2--12-rayed; fruit inflated proximally"	18
18	"Inflorescence generally elongated in fruit; basal leaves ciliate, adaxial hairs simple, some 2-rayed"	"Draba novolympica"
18	"Inflorescence umbel-like in fruit; basal leaves not ciliate, adaxial hairs 5--12-rayed"	"Draba subumbellata"
19	"Inflorescence axis glabrous"	20
19	"Inflorescence axis hairy"	25
20	"Hairs on basal leaves 8--12-rayed on abaxial surface"	"Draba lonchocarpa"
20	"Hairs on basal leaves 2--5-rayed on abaxial surface, occasionally also simple"	21
21	"Fruit base +- inflated; petals white; inflorescence umbel-like in fruit"	"Draba monoensis"
21	"Fruit base flat; petals yellow; inflorescence elongated in fruit"	22
22	"Seeds 8--12; pedicels decurrent at base"	"Draba incrassata"
22	"Seeds (12)14--44; pedicels not decurrent at base"	23
23	"Perennial herb, short-lived, not tufted; seeds 20--44; style <= 0.1 mm; petals 2--3 mm"	"Draba albertina"
23	"Perennial herb, not short-lived, tufted; seeds 12--20; style (0.2)0.5--2 mm; petals 4--7 mm"	24
24	"Seeds winged; basal leaves not ciliate; fruit generally not twisted, straight, occasionally +- twisted"	"Draba asterophora"
24	"Seeds wingless; basal leaves ciliate; fruit twisted, curved"	"Draba sharsmithii"
25	"Basal leaves with simple hairs; petals persistent"	"Draba longisquamosa"
25	"Basal leaves with some branched hairs; petals deciduous"	26
26	"Style (0.8)1--3.5 mm; petals yellow"	27
26	"Style 0.1--0.6 mm; petals white (yellow)"	29
27	"Cauline leaves 0(1)"	"Draba saxosa"
27	"Cauline leaves 4--33"	28
28	"Fruit oblong, not twisted; seeds 10--20; most proximal flowers bracted"	"Draba aureola"
28	"Fruit elliptic, generally twisted; seeds 16--28; flowers not bracted"	"Draba corrugata"
29	"Leaf hairs simple or 2-rayed"	30
29	"Leaf hairs generally 4--12-rayed"	31
30	"Flowers yellow; fruit flat, +- twisted, 2.5--5 mm wide"	"Draba lemmonii"
30	"Flowers white; fruit +- inflated proximally, not twisted, (1.2)1.5--2.5 mm wide"	"Draba monoensis"
31	"Fruit hairs 2--7-rayed only"	32
31	"At least some fruit hairs simple"	33
32	"Inflorescence not bracted; plant tufted; stem (1)2--10(15) cm"	"Draba breweri"
32	"Inflorescence bracted proximally; plant not tufted; stem (6)10--30(38) cm"	"Draba cana"
33	"Inflorescence 8--30(37)-flowered; leaves dentate; seeds (24)30--52"	"Draba praealta"
33	"Inflorescence 3--13-flowered; leaves entire; seeds 16--32"	34
34	"Leaf hairs on both surfaces 4--8-rayed; inflorescence axis not wavy in fruit; sepals persistent"	"Draba californica"
34	"Leaf hairs on abaxial surface 8--12-rayed; inflorescence axis +- wavy in fruit; sepals deciduous"	"Draba lonchocarpa"