1	"Leaves opposite, at least proximally"	2
1	"Leaves alternate throughout or in rosettes"	12
2	"Distal leaves opposite"	3
2	"Distal leaves alternate"	7
3	"Phyllaries in 3+ series, widely overlapping; perennial herb, fleshy, coastal"	"Jaumea {Jaumea carnosa}"
3	"Phyllaries in 1--2 series, barely overlapping; annual or perennial herb, generally not fleshy, coastal or interior"	4
4	"Plant white-hairy and sessile-glandular; old ray corolla papery, persistent on fruit when dry; disk flowers staminate"	"Arnica dealbata"
4	"Plant glabrous or +- hairy; old ray corolla deciduous from fruit; disk flowers generally fruiting"	5
5	"Ray flower generally 1 per head; ray < 1 mm"	"Flaveria {Flaveria trinervia}"
5	"Ray flowers 4--many; ray generally >> 1 mm"	6
6	"Leaf margin without embedded oil glands, base not bristly-ciliate; herbage generally not scented; spring-flowering"	Lasthenia
6	"Leaf margin with embedded oil glands, base bristly-ciliate; herbage strongly scented; summer/fall-flowering"	"Pectis {Pectis papposa var. papposa}"
7	"Ray white"	8
7	"Ray yellow"	9
8	"Ray not red-veined abaxially; e SnFrB, SnGb, SnBr, PR, SNE, D"	"Eriophyllum wallacei"
8	"Ray red-veined abaxially; SCoRI, TR, SnJt"	"Syntrichopappus lemmonii"
9	"Ray corolla with small lobe opposite ray"	Monolopia
9	"Ray corolla without small lobe opposite ray"	10
10	"Leaves mostly or all opposite"	Lasthenia
10	"Leaves mostly alternate"	11
11	"Leaves glabrous"	"Amblyopappus {Amblyopappus pusillus}"
11	"Leaves +- tomentose"	Eriophyllum
12	"Ray <= 1 mm"	13
12	"Ray > 1 mm"	17
13	Shrub	"Artemisia bigelovii"
13	Herb	14
14	"Leaf finely dissected; phyllaries unequal, overlapping in several series, scarious-margined"	Tanacetum
14	"Leaf entire to +- lobed; phyllaries +- equal, in 1--3 series, margins barely scarious or not (widely scarious in <i>Pentachaeta</i>)"	15
15	"Phyllaries in 2--3 series; leaves linear, entire"	Pentachaeta
15	"Phyllaries in 1 series; proximal leaves often toothed or lobed"	16
16	"Plant glabrous or sticky-glandular; fruit 1.5--2 mm"	"Amblyopappus {Amblyopappus pusillus}"
16	"Plant +- woolly; fruit 2.5--3 mm"	"Monolopia congdonii"
17	"Ray white to purple (sometimes multi-colored)"	18
17	"Ray yellow to orange (occasionally multi-colored)"	32
18	"Phyllaries unequal, in 2+ series, generally conspicuously overlapping, generally scarious-margined"	19
18	"Phyllaries +- equal, in 1--2 series, generally little overlapping, generally not scarious-margined"	25
19	"Subshrub --- ray fruit 1--3-winged"	"Argyranthemum {Argyranthemum foeniculaceum}"
19	Herb	20
20	"Leaf 1--3-pinnately dissected; heads few to many in rounded to +- flat-topped clusters"	21
20	"Leaf entire, serrate, or pinnately lobed; heads solitary or few in open, cyme-like cluster"	23
21	"Ultimate leaf segments flat"	"Tanacetum parthenium"
21	"Ultimate leaf segments thread-like"	22
22	"Herbage strongly scented; fruit obconic, weakly compressed or +- round in &times;-section, faintly 5-ribbed, glandular between ribs, ribs without embedded resin glands"	"Matricaria chamomilla"
22	"Herbage not scented; fruit 3-angled, +- compressed, 3--5-ribbed, minutely roughened between ribs, 2--3 ribs distally with embedded resin glands"	"Tripleurospermum {Tripleurospermum inodorum}"
23	"Perennial herb; heads 6--9 cm diam"	Leucanthemum
23	"Annual; heads 2.5--4(5.5) cm diam"	24
24	"Outer phyllary margins and tips not scarious; ray adaxially uniformly pale yellow or with darker yellow proximal band, abaxially steely blue; fruit densely woolly"	"Arctotheca calendula"
24	"Outer phyllary margins and tips scarious; ray adaxially and abaxially white (aging pink), proximally yellow; fruit faces glabrous"	"Mauranthemum {Mauranthemum paludosum}"
25	"Ray 25--40 mm; coarse perennial herb or subshrub"	Dimorphotheca
25	"Ray < 10 mm; annual or slender per"	26
26	"Leaf widely ovate, coarsely dentate or palmately lobed, abruptly petioled"	"Perityle emoryi"
26	"Leaf linear to obovate, entire to pinnately lobed (tip sometimes 3-lobed), sessile or tapered to petiole"	27
27	"Proximal leaves pinnately lobed"	Blennosperma
27	"Leaves entire, toothed, or 3-lobed"	28
28	"Perennial herb; moist habitats"	"Bellis {Bellis perennis}"
28	"Annual; dry habitats"	29
29	"Plant tomentose or becoming glabrous"	30
29	"Plant short-hairy"	31
30	"Ray not red-veined abaxially; e SnFrB, SnGb, SnBr, PR, SNE, D"	"Eriophyllum wallacei"
30	"Ray red-veined abaxially; SCoRI, TR, SnJt"	"Syntrichopappus lemmonii"
31	"Plant tufted or generally prostrate to ascending; D"	Monoptilon
31	"Plant +- erect; CW"	Pentachaeta
32	"Fruit drupe; shrub"	"Chrysanthemoides {Chrysanthemoides monilifera subsp. monilifera}"
32	"Fruit achene; generally herb or subshrub (except <i>Venegasia</i>)"	33
33	"Phyllaries unequal, overlapping in several series"	34
33	"Phyllaries +- equal (or outer longer), in 1--3 series, slightly overlapping or not"	38
34	"Phyllary margins conspicuously scarious"	35
34	"Phyllary margins not or barely scarious"	37
35	"Plant sticky-glandular"	"Heteranthemis {Heteranthemis viscidihirta}"
35	"Plant not glandular"	36
36	"Heads solitary or in open, leafy cymes; outer fruits 3-angled"	Glebionis
36	"Heads in dense, flat-topped clusters; fruits cylindric to obconic"	Tanacetum
37	"Leaf oblong to obovate, pinnately lobed, tomentose at least below; phyllaries narrow, appressed or tips spreading or reflexed"	Arctotheca
37	"Leaf widely ovate, entire to coarsely toothed, puberulent; phyllaries wide, outer spreading or reflexed"	"Venegasia {Venegasia carpesioides}"
38	"Ray fruit prickly, knobby, papillate, or ridged on back; phyllary margins generally narrowly scarious"	39
38	"Ray fruit generally smooth on back; phyllary margins generally not scarious"	41
39	"Involucre generally 5--9 mm; leaves glabrous or sparsely tomentose"	Blennosperma
39	"Involucre 10--20 mm; leaves puberulent and/or glandular"	40
40	"Ray fruit strongly curved [crescent-shaped or almost loop-like]; disk flowers staminate"	Calendula
40	"Ray fruit 3-angled, not curved; disk flowers fruiting, fruit flat"	Dimorphotheca
41	"Head hemispheric to ovoid or +- spheric; phyllaries spreading or reflexed"	Helenium
41	"Head cylindric to hemispheric; phyllaries erect or ascending"	42
42	"Plant green, glabrous to strigose, glandular or puberulent"	43
42	"Plant +- gray-tomentose"	44
43	"Phyllaries in 2--3 series; plant glandular"	"Amauriopsis {Amauriopsis dissecta}"
43	"Phyllaries in 1 series; plant not glandular, +- glabrous"	"Blennosperma nanum"
44	"Rays when dry persistent, papery, reflexed"	Baileya
44	"Rays when dry withering, deciduous"	45
45	"Ray corolla with small lobe opposite ray"	Monolopia
45	"Ray corolla without small lobe opposite ray"	46
46	"Annual, perennial herb, or subshrub; fruit 4(5)-angled or outer fruits compressed"	Eriophyllum
46	"Annual; fruit +- compressed"	Pseudobahia