1	"Ray flowers obscure, often << disk flowers (heads +- disciform); involucre subtended by leafy bracts"	"Pyrrocoma carthamoides var. cusickii"
1	"Ray flowers conspicuous, >> disk flowers; involucre not subtended by leafy bracts"	2
2	"Plant glandular"	3
2	"Plant glandless"	6
3	"Glands sessile; plant glabrous; heads crowded in spike-like clusters"	"Pyrrocoma lucida"
3	"Glands stalked; plant proximally generally hairy and red-tinged; heads in raceme- or panicle-like clusters"	4
4	"Heads in panicle-like clusters; plant sometimes becoming proximally glabrous"	"Pyrrocoma lanceolata var. subviscosa"
4	"Heads in raceme-like clusters; plant proximally tomentose"	5
5	"Plant densely glandular; phyllaries +- equal, barely overlapping, herbaceous nearly to base"	"Pyrrocoma hirta var. hirta"
5	"Plant sparsely glandular; phyllaries unequal, much overlapping, herbaceous only at tip"	"Pyrrocoma hirta var. lanulosa"
6	"Head generally 1(4)"	7
6	"Heads (1)3--25(50)"	9
7	"Phyllaries +- oblong to oblanceolate, graduated in 3--4 series, glabrous; fruit glabrous"	"Pyrrocoma apargioides"
7	"Phyllaries +- linear, in 2--3 series, barely or not overlapping, generally tomentose to woolly; fruit silky"	8
8	"Herbage tufted-woolly; involucre 10--13 mm; phyllaries unequal"	"Pyrrocoma uniflora var. gossypina"
8	"Herbage tomentose, becoming glabrous; involucre 6--9 mm; phyllaries equal"	"Pyrrocoma uniflora var. uniflora"
9	"Heads in +- flat-topped to panicle-like clusters"	10
9	"Heads in +- narrow raceme- or +- spike-like clusters"	11
10	"Leaves minutely spiny-serrate"	"Pyrrocoma lanceolata var. lanceolata"
10	"Leaves entire or minutely dentate"	"Pyrrocoma racemosa var. paniculata"
11	"Involucre 10--15 mm"	12
11	"Involucre 5--9 mm"	13
12	"Stem cobwebby, hairs tangled; basal leaves lanceolate; phyllaries densely long-soft-hairy"	"Pyrrocoma racemosa var. pinetorum"
12	"Stem generally glabrous; basal leaves oblanceolate to elliptic; phyllaries ciliate"	"Pyrrocoma racemosa var. racemosa"
13	"Heads in a narrow raceme- to panicle-like cluster, not crowded"	"Pyrrocoma racemosa var. paniculata"
13	"Heads generally crowded in a spike-like cluster"	14
14	"Involucre 12--16 mm diam, phyllaries yellow-green throughout, sparsely tomentose near base or throughout, tip glandular-ciliate"	"Pyrrocoma racemosa var. congesta"
14	"Involucre 5--7 mm diam, phyllaries green-tipped, leathery, ciliate (except recurved tip), margin translucent"	"Pyrrocoma racemosa var. sessiliflora"