1 "Involucre teeth not lobe-like, << tube, erect or +- so" 2
1 "Involucre teeth lobe-like, at least 1/2 tube, generally reflexed or spreading" 21
2 "Flowers hairy" 3
2 "Flowers glabrous" 6
3 "Leaf blades tomentose to densely so abaxially, generally glabrous adaxially; nw KR" "Eriogonum pyrolifolium var. coryphaeum"
3 "Leaf blades glabrous or short hairy on both surfaces; n KR, CaRH, c&s SNH, W&I, DMtns" 4
4 "Leaf blades glabrous; flowers white to rose; stem generally ascending; CaRH" "Eriogonum pyrolifolium var. pyrolifolium"
4 "Leaf blades short hairy; flowers cream to yellow; stem erect; n KR, W&I, DMtns" 5
5 "Flowers bright yellow, 3--3.5(4) mm; n KR" "Eriogonum hirtellum"
5 "Flowers cream to pale yellow, 3--6 mm; c&s SNH, W&I, n DMtns" "Eriogonum latens"
6 "Inflorescence not immediately subtended by a whorl of bracts; stem with whorl of bracts near middle" 7
6 "Inflorescence immediately subtended by whorl of bracts; stem without a whorl of bracts near middle" 10
7 "Flowers +- white to pink or rose-red; leaf blades silky-tomentose abaxially, 0.1--0.3(0.4) cm wide; c NCoRO" "Eriogonum kelloggii"
7 "Flowers yellow; leaf blades tomentose abaxially, 0.2--2(3) cm wide; not c NCoRO" 8
8 "Stems (0.3)0.4--0.6 dm; leaf blades 1--2(3) cm wide --- e KR" "Eriogonum alpinum"
8 "Stems 0.5--3 dm; leaf blades 0.2--0.7(0.8) cm wide" 9
9 "Involucre teeth 5--8, 0.5--1.5 mm; s KR, n NCoRH, n NCoRI" "Eriogonum libertini"
9 "Involucre teeth 8--10, 1--3 mm; SN (see also 29')" "Eriogonum prattenianum"
10 "Flowers chalky-white, white to rose or +- pale yellow; flower stipe 0.1--0.4 mm" 11
10 "Flowers yellow or +- brown to sulphur yellow or cream, occasionally with blush of pink-red to maroon (or white); flower stipe (0.1)0.3--1.5 mm" 12
11 "Flowers white to rose, 5--7 mm; involucres 5--10(12) mm; NW, CaR, SN, GB" "Eriogonum lobbii"
11 "Flowers chalky-white, 2.5--3.5 mm; involucres (2)2.5--3.5(4) mm; s SNH" "Eriogonum polypodum"
12 "Plant unisexual, pistillate and staminate plants morphologically different" 13
12 "Plant bisexual (but generally with some aborted male or female parts), otherwise not morphologically different" 16
13 "Leaf blades +- glabrous, bright green to olive-green adaxially; e KR, CaRH, n&c SNH" 14
13 "Leaf blades tomentose to densely so, generally not green adaxially; KR, SNH" 15
14 "Involucres 4--5 mm, 5--7 mm wide; leaf-blades narrow; CaRH" "Eriogonum marifolium var. cupulatum"
14 "Involucres 2--3 mm, 1.5--2 mm wide; leaf-blades wide to round; e KR, CaRH, n&c SNH" "Eriogonum marifolium var. marifolium"
15 "Pistillate inflorescence generally persistently head-like (or umbel-like after fertilization); leaf blades (0.5)1--2 cm, 0.5--1.5 cm wide, densely tomentose; petioles 0.7--3 cm; KR" "Eriogonum diclinum"
15 "Pistillate inflorescence initially head-like, umbel-like after fertilization; leaf blades 0.5--1.5 cm, 0.3--0.7 cm wide, generally tomentose; petioles (0.3)0.5--1 cm; SNH" "Eriogonum incanum"
16 "Flowers sulphur yellow; involucres long-soft-wavy-hairy; inflorescence often compound umbel-like" 17
16 "Flowers white, cream, pale yellow (yellow); involucres tomentose; inflorescence umbel-like" 18
17 "Leaf blades narrow-elliptic to -oblong, 0.3--0.6(0.8) cm wide; subshrub; KR, CaRH" "Eriogonum congdonii"
17 "Leaf blades oblong to obovate, (0.4)0.8--1.3 cm wide; perennial herb mat; n KR, s NCoRO, n NCoRH" "Eriogonum ternatum"
18 "Stems 0.2--0.6(1) dm; inflorescence +- head-like; flowers yellow to red or maroon, or white to pink-rose or deep red; s NCoRH, c&s NCoRI" 19
18 "Stems 0.4--4 dm; inflorescence compound-umbel- or umbel-like; flowers cream or +- yellow, blushed or not with pink-red to maroon; KR, s CaR, n SN" 20
19 "Involucres 4--6.5 mm; stipe 0.1--0.3 mm; flowers yellow to red or maroon; s NCoRO" "Eriogonum cedrorum"
19 "Involucres 3--4 mm; stipe 0.5--0.8 mm; flowers white to pink-rose or deep red; s NCoRH, c&s NCoRI" "Eriogonum nervulosum"
20 "Flowers 5--9 mm, cream (or yellow); fruit (5)5.5--8 mm; KR" "Eriogonum ursinum var. erubescens"
20 "Flowers 4--6 mm, pale yellow (or yellow); fruit 3--3.5 mm; s CaR, n SN" "Eriogonum ursinum var. ursinum"
21 "Flowers hairy" 22
21 "Flowers glabrous" 28
22 "Stem bractless --- GB" "Eriogonum caespitosum"
22 "Stem with whorl of subtending bracts at base of umbel, middle of stem, or middle of branches" 23
23 "Inflorescence scapose, involucres 1" 24
23 "Inflorescence not scapose, involucres >= 1" 26
24 "Leaf blades densely tomentose on both surfaces; e KR, e CaRH, n SNH, MP" "Eriogonum douglasii var. meridionale"
24 "Leaf blades sparsely tomentose to +- glabrous adaxially; CaRH, n&s SNH, MP" 25
25 "Leaf blades generally narrowly oblanceolate; CaRH, n SNH, MP" "Eriogonum sphaerocephalum var. halimioides"
25 "Leaf blades oblanceolate to elliptic; s SNH" "Eriogonum twisselmannii"
26 "Flowers 4--5 mm, yellow; leaf blades densely tomentose; plant 2.5--5 dm; NCoRI, n&c SNF" "Eriogonum tripodum"
26 "Flowers (5)6--9 mm, cream or pale to bright yellow; leaf blades densely tomentose to glabrous; plant 0.5--4 dm; CaRH, n SNH, MP" 27
27 "Flowers pale yellow to cream; CaRH, n SNH, MP" "Eriogonum sphaerocephalum var. halimioides"
27 "Flowers bright yellow; n SNH, MP" "Eriogonum sphaerocephalum var. sphaerocephalum"
28 "Inflorescence head-like, involucres not immediately subtended by leafy bracts; stem with a whorl of leafy bracts near middle; flowers yellow" 29
28 "Inflorescence umbel-like or compound-umbel-like, involucres immediately subtended by leafy bracts; stem with or without an additional whorl of bracts near middle; flowers white, yellow, or rose" 31
29 "Leaf blades (0.3)0.5--0.8 cm, sparsely tomentose to +- glabrous, bright green or olive-green adaxially; generally matted perennial herb; e KR" "Eriogonum siskiyouense"
29 "Leaf blades 0.5--1.5(2) cm, densely tomentose or +- glabrous adaxially, generally pale green adaxially; plant erect or rounded perennial herb or subshrub, occasionally mat; n&c SN, s SNH" 30
30 "Leaf blades tomentose abaxially, subglabrous adaxially; c&s SNH" "Eriogonum prattenianum var. avium"
30 "Leaf blades tomentose on both surfaces; n&c SN" "Eriogonum prattenianum var. prattenianum"
31 "Stem with whorl of leaf-like bracts near middle --- leaf blades generally linear-oblanceolate to oblanceolate; Wrn" "Eriogonum heracleoides var. heracleoides"
31 "Stems without a whorl of leaf-like bracts near middle" 32
32 "Flower stipe 0.1--0.4 mm --- stem prostrate to decumbent or weakly erect; inflorescence +- head- to umbel-like --- NW, CaR, SN, GB" "Eriogonum lobbii"
32 "Flower stipe 0.7--2 mm" 33
33 "Leaf blades (2)7--25 cm; stem generally +- inflated; NW, CaR" "Eriogonum compositum var. compositum"
33 "Leaf blades 0.3--3(4) cm; stem not inflated; most of California" 34
34 "Main inflorescence branches of 1 order, none with a whorl of bracts near middle" 35
34 "Main inflorescence branches of >= 2 orders, or at least some with a whorl of bracts near middle" 46
35 "Flowers generally +- white or cream to red, occasionally +- yellow" 36
35 "Flowers bright yellow" 38
36 "Leaf blades densely tomentose on both surfaces --- flowers generally lemon yellow to yellow-red; SnGb, SnBr" "Eriogonum umbellatum var. minus"
36 "Leaf blades tomentose to glabrous adaxially" 37
37 "Flowers pale yellow to cream or +- white (or green-white); leaf blades +- green adaxially; Wrn, W&I" "Eriogonum umbellatum var. dichrocephalum"
37 "Flowers yellow, in age red-brown to rose or pink, with large +- red spot on each lobe; leaf blades generally +- red adaxially; W&I (Inyo Mtns), DMtns" "Eriogonum umbellatum var. versicolor"
38 "Flower clusters with branches generally > 2.5 cm" 39
38 "Flower clusters with branches <= 2.5 cm" 42
39 "Leaf blades sparsely tomentose abaxially; subshrub --- SN, GB, nw DMoj" "Eriogonum umbellatum var. nevadense"
39 "Leaf blades densely white-tomentose or tomentose abaxially; subshrub or spreading to prostrate mat" 40
40 "Shrub 3--5 dm, on non-serpentine; KR, NCoRH, NCoRI, CaR, n SN, MP" "Eriogonum umbellatum var. dumosum"
40 "Perennial mat (0.7)1--4.5(5) dm, on serpentine; KR, n NCoRH, n CaRH" 41
41 "Stems 1--2.5(4) dm; leaf blades 0.5--2(3.5) cm; flowers 6--8(9) mm" "Eriogonum umbellatum var. goodmanii"
41 "Stems 0.5--1.5 dm; leaf blades 0.5--1(1.5) cm; flowers 3--6 mm" "Eriogonum umbellatum var. humistratum"
42 "Plant prostrate, subalpine and alpine --- c&s SNH, n W&I" "Eriogonum umbellatum var. covillei"
42 "Plant erect to +- spreading, generally not subalpine or alpine" 43
43 "Leaf blades sparsely tomentose abaxially; SN, GB, nw DMoj" "Eriogonum umbellatum var. nevadense"
43 "Leaf blades tomentose to densely so abaxially; KR, CaR, SN, MP, DMtns" 44
44 "Inflorescence branches (2.5)3--10(15) cm; CaR, n SN, MP" "Eriogonum umbellatum var. modocense"
44 "Inflorescence branches 1--2.5(4) cm; KR, s SNH, DMtns" 45
45 "Involucre tubes 3--4 mm; plant on serpentine; KR" "Eriogonum umbellatum var. nelsoniorum"
45 "Involucre tubes 2--3 mm; plant not on serpentine; s SNH, n DMtns" "Eriogonum umbellatum var. canifolium"
46 "Inflorescence with a whorl of bracts at middle (see also Eriogonum umbellatum var. polyanthum)" 47
46 "Inflorescence without a whorl of bracts at middle, bracts only at base of inflorescence or involucres" 48
47 "Flowers cream or +- white, 4--7 mm; Wrn" "Eriogonum umbellatum var. glaberrimum"
47 "Flowers yellow, 7--10 mm; n SNH" "Eriogonum umbellatum var. torreyanum"
48 "Flowers 7--10(12) mm; shrub; inflorescence 2--4-branched; KR" "Eriogonum umbellatum var. speciosum"
48 "Flowers 3--8 mm; perennial herb mat or subshrub, if shrub then inflorescence 3-branched; not of KR" 49
49 "Flowers cream, +- white, pale yellow, or green-yellow, or yellow, in age red-brown to rose or pink" 50
49 "Flowers yellow, in age not red-brown to rose or pink" 51
50 "Flowers cream, +- white, pale yellow, or green-yellow, without large +- red spot on each lobe; subshrub or shrub; e DMtns" "Eriogonum umbellatum var. juniporinum"
50 "Flowers yellow, in age red-brown to rose or pink, with large +- red spot on each lobe; spreading to +- prostrate mat; W&I (Inyo Mtns), DMtns" "Eriogonum umbellatum var. versicolor"
51 "Leaf blades glabrous to densely tomentose (see also Eriogonum umbellatum var. munzii of TR, SnJt)" 52
51 "Leaf blades sparsely to densely tomentose, or densely tomentose abaxially, less so to glabrous adaxially (rarely both surfaces tomentose in Eriogonum umbellatum var. munzii of TR, SnJt)" 56
52 "Leaf blades densely tomentose --- NCoRI, CW" "Eriogonum umbellatum var. bahiiforme"
52 "Leaf blades densely tomentose to glabrous" 53
53 "Leaf blades tomentose to densely so abaxially, tomentose to sparsely so adaxially; NW" 54
53 "Leaf blades generally sparsely tomentose to glabrous; not NW" 55
54 "Leaf blades (0.5)0.8--1.8(2) cm wide; involucre lobes (3)4--6 mm; KR" "Eriogonum umbellatum var. lautum"
54 "Leaf blades 0.3--0.7 cm wide; involucre lobes 1--3 mm; NCoR" "Eriogonum umbellatum var. smallianum"
55 "Leaf blades glabrous; s SNH, SNE, nw DMoj" "Eriogonum umbellatum var. chlorothamnus"
55 "Leaf blades sparsely tomentose to glabrous adaxially; se SN, TR, SNE, DMtns" "Eriogonum umbellatum var. subaridum"
56 "Shrub, densely branched --- n SNF, n SNH/CaRH" 57
56 "Perennial mat or more openly and sparsely branched subshrub or shrub" 58
57 "Leaf blades rusty-woolly to tomentose abaxially; inflorescence 3--4-branched, branches tomentose to woolly, central branch without a whorl of bracts near middle" "Eriogonum umbellatum var. ahartii"
57 "Leaf blades white-tomentose abaxially; inflorescence 1--2(3)-branched, branches sparsely tomentose to glabrous, central branch occasionally with a whorl of bracts near middle" "Eriogonum umbellatum var. polyanthum"
58 "Stems generally sparsely tomentose or glabrous" 59
58 "Stems generally tomentose or sparsely tomentose (or +- glabrous in age)" 60
59 "Leaf margins finely wavy; stems often with leaf-like bract near middle; KR, c NCoRH" "Eriogonum umbellatum var. argus"
59 "Leaf margins flat; stems without leaf-like bract near middle; SNH" "Eriogonum umbellatum var. furcosum"
60 "Involucre lobes (3)4--6 mm; leaf blades generally widely elliptic --- KR" "Eriogonum umbellatum var. lautum"
60 "Involucre lobes 1--3 mm; leaf blades elliptic" 61
61 "Leaf blades 0.5--1 cm wide; TR, SnJt" "Eriogonum umbellatum var. munzii"
61 "Leaf blades 0.3--0.7 cm wide; NCoR" "Eriogonum umbellatum var. smallianum"