1 "Phyllaries +- equal length, leaf-like or paper-like; sometimes each outer phyllary with a leaf-like or paper-like tip" 2
1 "Phyllaries unequal in a graduated series, paper-like or outer wholly leaf-like or with leaf-like tips or subapical patches" 12
2 "Ray flowers generally 1--18 (sometimes 0 in Ericameria greenei)" 3
2 "Ray flowers 0" 6
3 "Leaves glabrous to +- short-hairy, dotted with sessile or blister-like glands sunken in deep, round pits, resinous" 4
3 "Leaves glabrous, tomentose, or stalked-glandular, glands not in pits, often resinous" 5
4 "Heads in leafy spike-, raceme-, or narrow, panicle-like clusters; peduncles 1--15 mm; flowers 5--19" "Ericameria bloomeri"
4 "Heads solitary; peduncle 20--70 mm, bracts generally 0; flowers 28--78" "Ericameria linearifolia"
5 "Heads in congested, cyme- or raceme-like clusters; disk flowers 7--20" "Ericameria greenei"
5 "Heads 1 or 2--3 in leafy, raceme-like clusters; disk flowers 15--40" "Ericameria suffruticosa"
6 "Leaves with spreading, gland-tipped hairs" 7
6 "Leaves +- glabrous or +- white tomentose, hairs +- tightly-matted, not stalked-glandular" 8
7 "Stem densely, silvery-white tomentose; leaves generally oblanceolate, 2--7 mm wide, margins often wavy; phyllary tips erect" "Ericameria discoidea"
7 "Stem white to +- green, closely tomentose, hairs tightly matted; leaves generally linear, 1--3 mm wide, margins flat or rolled under, not wavy; phyllary tips erect to spreading" "Ericameria parryi var. aspera"
8 "Leaves 5--14 mm wide" "Ericameria parryi var. latior"
8 "Leaves 0.5--3 mm wide" 9
9 "Heads 1--2(4) at branch tips, generally overtopped by distal-most leaves" "Ericameria parryi var. monocephala"
9 "Heads (2)4--20+, generally not overtopped by distal-most leaves" 10
10 "Flowers 10--18 per head; outer phyllaries sometimes leaf-like; SnBr (Bear Valley)" "Ericameria parryi var. imula"
10 "Flowers 4--7 per head; outer phyllaries paper-like; SNH, GB, SnBr, DMtns" 11
11 "Phyllary tips +- recurved" "Ericameria parryi var. nevadensis"
11 "Phyllary tips erect to spreading" "Ericameria parryi var. vulcanica"
12 "Ray flowers generally (0)1--10(30)" 13
12 "Rays 0(7)" 24
13 "Ray and disk corollas white; outer and mid phyllary tips abruptly pointed, spreading or recurved, leaf-like, arising from obtuse to notched summit of phyllary body; leaf oblanceolate or narrowly obovate, often folded, 2--4 mm wide; Inyo Co." "Ericameria gilmanii"
13 "Ray and disk corollas yellow; phyllary tips acuminate, acute to rounded or abruptly pointed, erect, sometimes leaf-like" 14
14 "Mid phyllaries < 1 mm wide" 15
14 "Mid phyllaries > 1.0 mm wide" 19
15 "Style appendage +- = stigma; rays 0--3; flower Mar--Jun" "Ericameria cooperi var. cooperi"
15 "Style appendage > stigma; rays 1--20; flower (Jul)Aug--Dec" 16
16 "Mid phyllary midvein scarcely evident to slightly raised and slightly widened toward tip; disk flowers 4--8; fruit glabrous to densely hairy" "Ericameria nana"
16 "Mid phyllary midvein conspicuously raised throughout its length or on the distal 1/2 and slightly to greatly widened toward tip; disk flowers 5--20; fruit hairy" 17
17 "Mid phyllary tips acute to long-acuminate; midvein generally prominently raised along phyllary length, slightly widened toward tip; heads in cyme-like clusters; DMtns" "Ericameria laricifolia"
17 "Mid phyllary tips rounded to acute; midvein generally distally prominently raised as a much darker, abaxial, narrowly obovate structure, proximal portion of midvein not noticeably raised or not at all evident; heads in raceme- to panicle-like clusters; SCo, DSon" 18
18 "Leaves 5--20(30) mm; axillary leaves 2--10 per node; outer and mid phyllaries strongly thickened near tip; midveins often not evident on proximal 1/2 of each phyllary; flowers 6--12(14); Riverside to Ventura cos." "Ericameria palmeri var. pachylepis"
18 "Leaves 20--40 mm; axillary leaves 1--2 per node; phyllary tips not strongly thickened; midveins generally evident on proximal 1/2 of each phyllary; flowers 12--30; San Diego Co." "Ericameria palmeri var. palmeri"
19 "Style appendage +- = stigma; rays 0--3; flower Mar--Jun" "Ericameria cooperi var. cooperi"
19 "Style appendage >= stigma; rays 1--30; flower (Jul)Aug--Dec (Ericameria pinifolia occasionally flowering in spring)" 20
20 "Mid phyllary midvein scarcely evident to slightly raised and slightly widened distally; phyllary margins entire, glabrous; disk flrs 4--8; leaves without regularly spaced deep resin pits; DMtns" "Ericameria nana"
20 "Mid phyllary midvein prominently raised on distal 1/2 or throughout length of phyllary; phyllary margins entire, glabrous or ciliate to fringed; disk flowers 6--25; leaves generally with regularly spaced deep resin pits" 21
21 "Mid phyllary tips acute to long-acuminate; midvein generally prominently raised throughout phyllary length, slightly widened distally; margins glabrous or ciliate; DMtns" "Ericameria laricifolia"
21 "Mid phyllary tips mucronate to long-acuminate; margins ciliate, fringed, or irregularly toothed; widespread" 22
22 "Tips of outermost phyllaries rounded, acute, acuminate, or abruptly pointed; fruit generally silky to densely hairy" "Ericameria fasciculata"
22 "Tips of outermost phyllaries generally abruptly pointed, leaf-like; fruit glabrous or hairy, more densely distally" 23
23 "Leaves 3--18(23) mm; ray flowers 2--6; disk flowers 5--14; generally dunes or sand hills along or near coast (occasionally inland), Sonoma to Los Angeles cos." "Ericameria ericoides"
23 "Leaves 10--40 mm; ray flowers 3--10 in fall, 15--30 in spring; disk flowers 11--25; sandy to stony, often disturbed soils away from immediate coast, Ventura Co. and s" "Ericameria pinifolia"
24 "Leaves wedge-shaped, obovate, or spoon-shaped, 2--16 mm wide, tips generally obtuse, rounded, or notched" 25
24 "Leaves thread-like, linear, elliptic, oblanceolate, or oblong, 0.3--12 mm wide, tips acute" 27
25 "Disk flowers 36--70 --- San Diego Co." "Ericameria cuneata var. macrocephala"
25 "Disk flowers 7--33" 26
26 "Leaves sessile, blades wedge-shaped, largest 3--14(18) mm, 2--9(12) mm wide" "Ericameria cuneata var. cuneata"
26 "Leaves stalked, blades spoon-shaped, largest (9)12--25 mm, 4--16 mm wide" "Ericameria cuneata var. spathulata"
27 "Leaves and often young stem dotted with round, +- evenly spaced, resin-filled pits" 28
27 "Leaves and young stem lacking round resin pits" 33
28 "Outer and mid phyllaries with leaf-like, recurved tips; corolla white" "Ericameria albida"
28 "Outer and mid-level phyllary tips rounded to acute or acuminate; corolla yellow" 29
29 "Leaves oblong to oblanceolate, flat to slightly concave, 3--12 mm wide" "Ericameria parishii var. parishii"
29 "Leaves thread-like to narrowly oblong or oblanceolate, grooved, 0.5--3 mm wide" 30
30 "Phyllaries thin, midvein often evident but not raised or enlarged at tip" "Ericameria paniculata"
30 "Phyllary midvein obscure or very prominently raised and expanded at tip" 31
31 "Phyllary midvein generally obscure proximal 1/2, tip bearing a prominent, +- spheric resin gland" "Ericameria teretifolia"
31 "Phyllary midvein prominently raised and expanded at tip" 32
32 "Leaves 25--90 mm; heads in flat-topped or convex cyme-like clusters, peduncle 1--15 mm, bracts 0--7, scale-like; flowers 10--25" "Ericameria arborescens"
32 "Leaves 10--25 mm; heads 1 or in raceme- to panicle-like clusters, peduncle 3--20 mm, leafy or bracted; disk flowers 6--16(22)" "Ericameria brachylepis"
33 "Phyllaries spiraled, outermost leaf-like, inner parchment-like, bodies of outer and mid phyllaries with tooth-like, spreading to recurved tips; Shasta, Tehama, and Trinity cos., serpentine soils" "Ericameria ophitidis"
33 "Phyllaries generally aligned vertically, dry, paper-like (if spiraled, outer and mid phyllary tips not tooth-like); tips long-tapered, erect or recurved; widespread, often abundant on various soils" 34
34 "Fruit glabrous" "Ericameria nauseosa var. leiosperma"
34 "Fruit hairy, +- long-hairy or silky (only distally in Ericameria nauseosa var. washoensis)" 35
35 "Style appendages generally < stigmas (+- =)" 36
35 "Style appendages > stigmas" 38
36 "Corolla lobes 0.5--1 mm" "Ericameria nauseosa var. hololeuca"
36 "Corolla lobes 1.5--2.5 mm" 37
37 "Phyllary tips recurved --- s California" "Ericameria nauseosa var. ceruminosa"
37 "Phyllary tips erect" "Ericameria nauseosa var. oreophila"
38 "Corolla lobes sparsely long-hairy; fruit distally hairy" "Ericameria nauseosa var. washoensis"
38 "Corolla lobes +- glabrous; fruit hairy throughout" 39
39 "Stem loosely tomentose, gray-white to dark green; leaves present at flower" "Ericameria nauseosa var. speciosa"
39 "Stem closely tomentose with tightly matted hairs, generally +- yellow-green, sometimes becoming +- white; leaves present or 0 at flower" 40
40 "Stem generally leafy at flower; leaves 20--60 mm" "Ericameria nauseosa var. bernardina"
40 "Stem nearly leafless at flower; leaves 10--30 mm" "Ericameria nauseosa var. mohavensis"