1	"Fruit, generally ovary hairy"	2
1	"Fruit, ovary glabrous"	14
2	"Fruit pedicel < 2.5 mm; petals +- yellow to brick-red"	"Boechera yorkii"
2	"Fruit pedicel > 2.5 mm; petals purple, lavender, or white"	3
3	"Fruit pedicel base generally abruptly recurved; fruit generally appressed to inflorescence axis"	4
3	"Fruit pedicel base not abruptly recurved; fruit generally not appressed to inflorescence axis"	5
4	"Stems elevated above ground surface on woody base; petals 9--16 mm; fruit 2.5--4 mm wide; seeds 1.7--2.8 mm"	"Boechera pulchra"
4	"Stems from +- ground surface, from non-woody caudex; petals 4--8 mm; fruit 0.9--1.8 mm wide; seeds 1--1.4 mm"	"Boechera retrofracta"
5	"Proximal stems with simple and 2-rayed hairs only"	6
5	"Proximal stems with at least some 3--12-rayed hairs"	7
6	"Fruit pedicel with branched hairs only"	"Boechera arcuata"
6	"Fruit pedicel with generally simple hairs"	"Boechera breweri subsp. breweri"
7	"Petals generally < 9 mm"	8
7	"Petals generally > 9 mm"	11
8	"Stem proximally with 7--12-rayed hairs; seeds 1--1.3 mm, generally in 2 rows"	"Boechera shockleyi"
8	"Stem proximally with generally 3--7-rayed hairs; seeds 1.4--6 mm, in 1 row"	9
9	"Basal leaves > 6 mm wide; fruit erect to ascending; seeds 2.5--6 mm, wing 0.7--1.8 mm wide"	"Boechera repanda"
9	"Basal leaves < 6 mm wide; fruit horizontal to pendent (appressed); seeds 1.4--2.5 mm, wing 0.05--0.3 mm wide"	10
10	"Style < 0.2 mm; basal leaves generally dentate; fruit 1.9--2.2 mm wide; seeds 1.4--1.8 mm"	"Boechera puberula"
10	"Style 1.5--2 mm; basal leaves entire; fruit 2.5--3 mm wide; seeds 2--2.5 mm"	"Boechera serpenticola"
11	"At least some basal leaves prominently dentate to +- pinnately lobed; style 0.5--1 mm; ovules < 60"	"Boechera subpinnatifida"
11	"Basal leaves generally entire; style generally < 0.5 mm; ovules > 60"	12
12	"Basal leaves 1--2 mm wide; inflorescence 7--15-flowered; fruit pedicel generally ascending near base, recurved near tip"	"Boechera lincolnensis"
12	"Basal leaves 3--13 mm wide; inflorescence > 15-flowered; fruit pedicel descending or horizontal near base"	13
13	"Fruit generally > 7 cm, sparsely hairy throughout; seeds 1.7--2 mm, generally in 1 row"	"Boechera californica"
13	"Fruit generally < 7 cm, hairy on distal 2/3, glabrous near base; seeds 2--2.5 mm, generally irregularly in 2 rows"	"Boechera xylopoda"
14	"Cauline leaf base not lobed"	15
14	"Cauline leaf base lobed"	37
15	"Style > 2.2 mm"	16
15	"Style < 2.2 mm"	17
16	"Petals +- white, 6--8 mm; fruit pendent, 4--7.5 cm"	"Boechera constancei"
16	"Petals lavender to purple, 8--13 mm; fruit ascending, 1.5--2.5 cm"	"Boechera parishii"
17	"Basal leaves glabrous or hairs simple only"	18
17	"Basal leaves with at least some branched hairs"	20
18	"Leaf margins with minute simple hairs; petals 4--5 mm"	"Boechera shevockii"
18	"Leaves glabrous; petals 6--10 mm"	19
19	"Caudex with crowded, persistent leaf bases; fruit ascending, not appressed to inflorescence axis; seeds in 1 row"	"Boechera davidsonii"
19	"Caudex without crowded, persistent leaf bases; fruit erect, appressed to inflorescence axis; seeds generally in 2 rows"	"Boechera lyallii"
20	"Plant generally glabrous throughout except margins of basal leaves"	21
20	"Plant at least hairy on surfaces of basal leaves, generally throughout pl"	24
21	"Fruit generally > 3 mm wide; seeds 3--6 mm"	22
21	"Fruit generally < 3 mm wide; seeds 1.5--2.2 mm"	23
22	"Margins of basal leaves with some 3--4-rayed hairs; ovules 18--30; pollen spheric"	"Boechera covillei"
22	"Margins of basal leaves with simple and 2-rayed hairs; ovules 10--20; pollen ellipsoid"	"Boechera howellii"
23	"Petals 6--8.5 mm; fruit pedicel erect; seeds generally in 2 rows"	"Boechera lyallii"
23	"Petals 4--5 mm; fruit pedicel ascending; seeds in 1 row"	"Boechera tiehmii"
24	"Fruit pendent or descending"	25
24	"Fruit erect, ascending, or horizontal"	28
25	"Fruit 5--8 mm wide; seeds 5--6 mm"	"Boechera glaucovalvula"
25	"Fruit < 3 mm wide; seeds < 2 mm"	26
26	"Fruit pedicel base generally abruptly recurved; fruit reflexed, generally appressed to inflorescence axis; cauline leaves 15--40; inflorescence generally > 15-flowered"	"Boechera retrofracta"
26	"Fruit pedicel base not abruptly recurved; fruit wide-pendent, not appressed to inflorescence axis; cauline leaves 2--17; inflorescence < 15-flowered"	27
27	"Surfaces of basal leaves with simple and 2-rayed hairs"	"Boechera pendulina"
27	"Surfaces of basal leaves with 4--8-rayed hairs"	"Boechera pendulocarpa"
28	"Inflorescence 1-sided in fruit"	"Boechera lemmonii"
28	"Inflorescence not 1-sided in fruit"	29
29	"Basal leaves generally wavy-margined to dentate, generally > 10 mm wide"	"Boechera repanda"
29	"Basal leaves entire, generally < 10 mm wide"	30
30	"Proximal stems with simple and branched hairs"	31
30	"Proximal stems with branched hairs only"	32
31	"Petals lavender to purple; fruit 1.3--2 mm wide; ovules 24--40"	"Boechera paupercula"
31	"Petals white; fruit 4--5 mm wide; ovules 8--12"	"Boechera pygmaea"
32	"Surfaces of basal leaves with at least some 8--14-rayed hairs"	33
32	"Surfaces of basal leaves with 2--7-rayed hairs only"	34
33	"Petals 5--6 mm; style < 0.5 mm"	"Boechera dispar"
33	"Petals 9--14 mm; style 0.7--2 mm"	"Boechera johnstonii"
34	"Fruit 3--5.5 mm wide; seeds 3--8 mm, wing 0.8--2.5 mm wide"	35
34	"Fruit 2--3.2 mm wide; seeds 2.5--3.5 mm, wing 0.2--0.9 mm wide"	36
35	"Basal leaves with short-stalked hairs generally 0.1--0.25 mm; fruit edges wavy, constricted between seeds"	"Boechera platysperma"
35	"Basal leaves with long-stalked hairs generally 0.25--0.5 mm; fruit edge not wavy or constricted between seeds"	"Boechera ultraalsa"
36	"Sepals glabrous; basal leaves 2--6 mm wide, with generally sessile hairs; fruit erect-ascending, generally appressed to inflorescence axis"	"Boechera elkoensis"
36	"Sepals sparsely hairy; basal leaves 1--3 mm wide, with stalked hairs; fruit ascending, not appressed to inflorescence axis"	"Boechera pinzliae"
37	"Stems glabrous proximally"	38
37	"Stems hairy proximally"	50
38	"Fruit erect, generally appressed to inflorescence axis"	39
38	"Fruit reflexed, pendent, horizontal, or ascending (+- erect), generally not appressed to inflorescence axis except generally when reflexed"	42
39	"Basal leaves with sessile 2-rayed mixed with 3- or 4-rayed hairs"	"Boechera calderi"
39	"Basal leaves with either sessile 2-rayed or short-stalked 2--6-rayed hairs, or occasionally glabrous"	40
40	"Petals white, occasionally pale lavender in age; cauline leaves 6--52; surfaces or margins of basal leaves with sessile 2 rayed hairs, occasionally glabrous"	"Boechera stricta"
40	"Petals lavender to purple; cauline leaves 1--7; surfaces of basal leaves glabrous, margins with simple and short-stalked, branched hairs, occasionally glabrous"	41
41	"Ovules generally < 30; seed in 1 row, > 3 mm, wing 1--1.5 mm wide"	"Boechera covillei"
41	"Ovules generally > 30; seed generally in 2 rows, < 3 mm, wing 0.3--0.5 mm wide"	"Boechera lyallii"
42	"Fruit pendent to strongly reflexed"	43
42	"Fruit ascending to horizontal or +- descending (+- erect)"	45
43	"Stems arising at ground level, generally lacking woody bases; surfaces of basal leaves with some simple hairs; inflorescence generally > 12-flowered"	"Boechera rectissima"
43	"Stems elevated above ground level on woody base; surfaces of basal leaves lacking simple hairs, generally glabrous; inflorescence generally < 12-flowered"	44
44	"Petals 8--11 mm, +- white; fruit 2.5--3.5 mm wide; inflorescence 3--7-flowered"	"Boechera rollei"
44	"Petals 4.5--6 mm, +- purple or rose at least near tip; fruit 3--6 mm wide; inflorescence 6--12-flowered"	"Boechera suffrutescens"
45	"Cauline leaves > 14; seeds in 2 rows; fruit 6--10 cm; ChI"	"Boechera hoffmannii"
45	"Cauline leaves < 14; seeds in 1 row; fruit generally < 6 cm; montane habitats on mainland"	46
46	"Fruit > 2.9 mm wide; seeds 3--6 mm"	47
46	"Fruit < 2.9 mm wide; seeds 1--2.2 mm"	48
47	"Margins of basal leaves with some 3--4-rayed hairs; ovules 18--30; pollen spheric"	"Boechera covillei"
47	"Margins of basal leaves with simple and 2-rayed hairs; ovules 10--20; pollen ellipsoid"	"Boechera howellii"
48	"Inflorescence 1-sided in fruit"	"Boechera lemmonii"
48	"Inflorescence not 1-sided in fruit"	49
49	"Surfaces, margins of basal leaves with 4--7-rayed hairs; ovules 56--80; pollen spheric"	"Boechera peirsonii"
49	"Surfaces of basal leaves glabrous, margins with simple and 2--3-rayed hairs; ovules 14--22; pollen ellipsoid"	"Boechera tiehmii"
50	"Fruit descending, pendent, or strongly reflexed"	51
50	"Fruit erect, ascending, or horizontal (pendent)"	67
51	"Fruit pedicel base generally abruptly recurved"	52
51	"Fruit pedicel base +- recurved or straight"	55
52	"Fruit > 2.7 mm wide; ovules 20--30; inflorescence 6--12-flowered"	"Boechera suffrutescens"
52	"Fruit < 2.7 mm wide; ovules 46--126; inflorescence generally > 12-flowered"	53
53	"Stem proximally with branched hairs only"	"Boechera retrofracta"
53	"Stem proximally with simple and branched hairs, or simple hairs only"	54
54	"Stem proximally with simple and branched hairs; petals 4--6 mm"	"Boechera pinetorum"
54	"Stem proximally with simple hairs only; petals 3--4 mm"	"Boechera rectissima"
55	"Fruit pedicel hairy"	56
55	"Fruit pedicel glabrous (sparsely hairy)"	61
56	"Stem proximally with simple and branched hairs, or simple hairs only"	57
56	"Stem proximally with branched hairs only"	59
57	"Petals generally > 8 mm, purple to magenta; stems elevated above ground level on woody caudex with crowded, persistent leaf bases; pollen ellipsoid"	"Boechera koehleri"
57	"Petals generally < 8 mm, lavender to white; stems from +- ground level, generally lacking woody caudex and crowded, persistent leaf bases; pollen spheric"	58
58	"Fruit spreading-descending; fruit pedicel with many 2--3-rayed hairs"	"Boechera pauciflora"
58	"Fruit reflexed to +- appressed; fruit pedicel with few simple and 2-rayed hairs only, occasionally glabrous"	"Boechera pinetorum"
59	"Petals generally > 9 mm; fruit generally > 6 cm"	"Boechera californica"
59	"Petals generally < 9 mm; fruit generally < 6 cm"	60
60	"Surfaces of basal leaves with hairs 0.1--0.2 mm; seed wing 0.25--0.5 mm wide; ovules 34--64; pollen ellipsoid"	"Boechera cobrensis"
60	"Surfaces of basal leaves with hairs 0.2--0.7 mm; seed wing < 0.25 mm wide; ovules 74--134; pollen spheric"	"Boechera inyoensis"
61	"Petals generally > 8 mm, purple to magenta; caudex woody, leaf bases crowded, persistent"	"Boechera koehleri"
61	"Petals generally < 8 mm, white to lavender (rose-purple); caudex woody or not, crowded-persistent leaf bases 0"	62
62	"Fruit > 2.7 mm wide; seed wing > 0.7 mm wide; stems elevated above ground surface on woody caudex"	"Boechera suffrutescens"
62	"Fruit < 2.7 mm wide; seed wing < 0.7 mm wide; stems generally not elevated above ground surface on woody caudex"	63
63	"Fruit reflexed to +- appressed; pollen spheric; KR, CaR, SN"	64
63	"Fruit wide-pendent to spreading-descending, not appressed; pollen ellipsoid; SW, GB, D"	65
64	"Stem proximally with stalked, 2--5-rayed hairs; seeds 1.5--1.8 mm"	"Boechera pinetorum"
64	"Stem proximally with +- sessile, 2-rayed hairs; seeds 2--2.5 mm"	"Boechera tularensis"
65	"Stem proximally generally simple-hairy; seeds in 2 rows"	"Boechera pendulina"
65	"Stem proximally generally branched-hairy; seeds in 1 row"	66
66	"Basal leaves dentate; stem proximally with 2--5-rayed hairs"	"Boechera perennans"
66	"Basal leaves entire; stem proximally with 4--10-rayed hairs"	"Boechera cobrensis"
67	"Leaf hairs +- sessile, branches generally appressed; sepals generally glabrous"	68
67	"Leaf hairs stalked, branches not appressed; sepals generally hairy"	72
68	"Basal leaves with branched hairs 2-rayed only; petals white, occasionally pale lavender in age; pollen ellipsoid"	"Boechera stricta"
68	"Basal leaves with some 3--4-rayed hairs; petals purple to lavender (+- white); pollen spheric"	69
69	"Fruit erect to ascending, generally appressed to inflorescence axis"	70
69	"Fruit spreading-ascending to horizontal, not appressed to axis"	71
70	"Cauline leaves 3--6; seeds 2.5--3.5 mm"	"Boechera elkoensis"
70	"Cauline leaves > 6; seeds 1.4--2 mm"	"Boechera pratincola"
71	"Cauline leaves generally > 10; fruit 1.7--2.5 mm wide; seeds 1.4--2 mm"	"Boechera divaricarpa"
71	"Cauline leaves generally < 10; fruit 2.5--3.5 mm wide; seeds 2.5--3.2 mm"	"Boechera rigidissima"
72	"Stem proximally with some simple hairs"	73
72	"Stem proximally with branched hairs only"	81
73	"Fruit erect, appressed to inflorescence axis; ovules 24--40"	"Boechera paupercula"
73	"Fruit ascending to horizontal, not appressed to inflorescence axis; ovules > 40"	74
74	"Fruit pedicel hairs 2--4-rayed only"	75
74	"Fruit pedicel glabrous or with simple, occasionally some 2-rayed hairs"	77
75	"Fruit 1.2--1.5 mm wide, ovules 46--52; leaf surface hairs < 0.3 mm"	"Boechera evadens"
75	"Fruit 1.5--2.2 mm wide, ovules 80--250; leaf surface hairs >= 0.3 mm"	76
76	"Petals 9--14 mm, purple; fruit pedicel generally > 10 mm; pollen ellipsoid"	"Boechera arcuata"
76	"Petals 5--8 mm, lavender to +- white; fruit pedicel generally < 10 mm; pollen spheric"	"Boechera pauciflora"
77	"Basal leaves generally <= 3 mm wide; caudex woody, with crowded, persistent leaf bases"	"Boechera koehleri"
77	"Basal leaves generally > 3 mm wide; caudex woody or not, crowded-persistent leaf bases 0"	78
78	"Distal cauline leaves glabrous, occasionally ciliate; cauline leaf basal lobes generally > 3 mm; NW, CaR, SNE"	"Boechera sparsiflora"
78	"Distal cauline leaves hairy; cauline leaf basal lobes generally < 3 mm; widespread"	79
79	"Stem proximally with some 3 rayed, 0.1--0.5 mm hairs"	"Boechera rubicundula"
79	"Stem proximally with simple and 2-rayed hairs only (all simple), 0.4--1 mm"	80
80	"Stem 0.6--2 dm; fruit pedicel generally < 9 mm, hairy"	"Boechera breweri subsp. breweri"
80	"Stem 1.8--4.5 dm; fruit pedicel generally > 9 mm, glabrous or hairs few, scattered"	"Boechera breweri subsp. shastaensis"
81	"Inflorescence 1-sided in fruit"	"Boechera lemmonii"
81	"Inflorescence not 1-sided in fruit"	82
82	"Stem proximally with at least some 2--3-rayed hairs"	83
82	"Stem proximally with 4--12-rayed hairs only"	86
83	"Petals 8--10 mm; inflorescence 30--70-flowered; pollen ellipsoid; ChI"	"Boechera hoffmannii"
83	"Petals 4--7 mm; inflorescence 5--25-flowered; pollen spheric; mainland montane areas"	84
84	"Petals white or lavender; fruit < 1.9 mm wide; KR"	"Boechera acutina"
84	"Petals purple; fruit > 1.9 mm wide; SnBr, W&I"	85
85	"Inflorescence 12--25-flowered; stem proximally with hairs 0.4--0.6 mm only; seeds 1--1.5 mm; SnBr"	"Boechera peirsonii"
85	"Inflorescence 5--8-flowered; stem proximally with hairs 0.05--0.2 mm only; seeds 2.5--3.5 mm; W&I"	"Boechera pinzliae"
86	"Petals 3--5 mm"	87
86	"Petals 5--9 mm"	88
87	"Stems > 1.5 dm; fruit 4--6.2 cm; ovules 48--68"	"Boechera bodiensis"
87	"Stems generally < 1.5 dm; fruit 1.7--4.5 cm; ovules 32--44"	"Boechera depauperata"
88	"Style 1.5--2 mm; ovules 20--24"	"Boechera serpenticola"
88	"Style < 0.7 mm; ovules 74--190"	89
89	"Petals 1.2--2 mm wide; surfaces of basal leaves with hairs 0.2--0.7 mm; seeds 1.7--2 mm; pollen spheric"	"Boechera inyoensis"
89	"Petals 0.8--1.2 mm wide; surfaces of basal leaves with hairs 0.1--0.2 mm; seeds 1--1.3 mm; pollen ellipsoid"	"Boechera shockleyi"