1	"Heads 1 per flower stem"	2
1	"Heads 2--many per flower stem"	4
2	"Stem 5--12 cm; leaves thick, green adaxially, tips notched"	"Antennaria suffrutescens"
2	"Stem < 4 cm; leaves thin, gray-tomentose adaxially, tips acute"	3
3	"Stolons 0"	"Antennaria dimorpha"
3	"Stolons long, slender, +- leafless"	"Antennaria flagellaris"
4	"Stolons 0, plants not forming mats"	5
4	"Stolons present, plants forming mats"	8
5	"Involucre proximally densely tomentose; phyllary tips generally pink to red"	"Antennaria geyeri"
5	"Involucre +- glabrous"	6
6	"Proximal leaves 7--20 mm wide; stem 18--40 cm; phyllaries white or cream, unequal"	"Antennaria argentea"
6	"Proximal leaves 1--10 mm wide; stems 7--25 cm; phyllaries straw-colored or pale, +- equal"	7
7	"Heads 10--30 in raceme- or panicle-like cluster"	"Antennaria luzuloides subsp. aberrans"
7	"Heads 10--110 in +- flat-topped, cyme-like cluster"	"Antennaria luzuloides subsp. luzuloides"
8	"Rosette leaves elliptic, green adaxially; inflorescence raceme- or panicle-like; peduncles 10--30 mm; inflorescence finely glandular"	"Antennaria racemosa"
8	"Rosette leaves linear or oblanceolate to spoon- or wedge-shaped; inflorescence cyme-like; peduncles < 5 mm; inflorescence glandular or not"	9
9	"Rosette leaves green or lightly tomentose adaxially, 1--3-veined"	10
9	"Rosette leaves gray- to silvery-tomentose adaxially, 1-veined"	11
10	"Rosette leaves > 6 mm wide, 1--3-veined; cauline leaves 20--40 mm; inflorescence not glandular; KR"	"Antennaria howellii subsp. howellii"
10	"Rosette leaves <= 6 mm wide, 1-veined; cauline leaves 7--16 mm; inflorescence generally glandular; SnBr"	"Antennaria marginata"
11	"Phyllaries dark brown to black; stem 3--13 cm"	12
11	"Phyllaries white to pale yellow, rose or pale brown; stem 6--40 cm"	13
12	"Most proximal cauline leaf 11--20 mm; herbage generally not glandular; pistillate flower corolla 3--4.5 mm in fruit; staminate corolla generally 2.8--4.5 mm in flower"	"Antennaria media"
12	"Most proximal cauline leaf <= 11 mm; herbage generally glandular; pistillate corolla 2--3 mm in fruit; staminate corolla generally <= 2.8 mm in flower"	"Antennaria pulchella"
13	"Phyllaries white-tipped with a prominent +- black-brown spot near base of scarious part"	"Antennaria corymbosa"
13	"Phyllaries white or white-tipped, rose, straw-colored or (paler) brown, not dark-spotted near base"	14
14	"Stem distally stalked-glandular"	"Antennaria microphylla"
14	"Stem not glandular"	15
15	"Stolons slightly woody, ascending; phyllaries pale yellow to pale brown distally, narrow and acute (pistillate) or wide and blunt (staminate); staminate plants present --- n SNH, W&I"	"Antennaria umbrinella"
15	"Stolons not woody, horizontal to ascending; phyllaries various colors, tips acute; staminate plants +- 0"	16
16	"Longest leaf of flower rosettes 8--20 mm; phyllaries often brown"	"Antennaria rosea subsp. confinis"
16	"Longest leaf of flower rosettes 20--40 mm; phyllaries generally not brown"	"Antennaria rosea subsp. rosea"