Perennials, 5–10 cm. Leaves: basal 2-pinnate, 3–20 cm, lobes 2–50 × 0.5–2 (–3) mm; cauline 0–12. Heads 1–60 per stem. Peduncles 1–16 cm. Phyllaries whitish to yellowish, 3–14 × 2–5 mm. Ray-florets 0. Disc-florets 10–80; corollas usually yellowish, sometimes whitish, 2.2–7 mm, tubes 1–2.5 mm, throats campanulate, 1–3 mm, lengths 2–8 times lobes. Cypselae 3–7 mm, ± hirtellous to villous; pappi of 12–22 scales 0.1–3 mm.

Distribution

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Alta., Sask., Ariz., Calif., Colo., Idaho, Kans., Mont., N.Dak., N.Mex., Nebr., Nev., Oreg., S.Dak., Tex., Utah, Wash., Wyo., n Mexico

Discussion

Varieties 13 (13 in the flora).

Some plants are morphologically intermediate between some pairs of varieties of Hymenopappus filifolius as treated by B. L. Turner (1956).

Selected References

None.

Lower Taxa

Hymenopappus filifolius var. cinereus, Hymenopappus filifolius var. eriopodus, Hymenopappus filifolius var. filifolius, Hymenopappus filifolius var. idahoensis, Hymenopappus filifolius var. lugens, Hymenopappus filifolius var. luteus, Hymenopappus filifolius var. megacephalus, Hymenopappus filifolius var. nanus, Hymenopappus filifolius var. nudipes, Hymenopappus filifolius var. parvulus, Hymenopappus filifolius var. pauciflorus, Hymenopappus filifolius var. polycephalus, Hymenopappus filifolius var. tomentosus

Key

1	Axils of basal leaves glabrous or sparsely tomentose; cauline leaves 0 or 1(–2)	> 2
1	Axils of basal leaves ± densely tomentose; cauline leaves (0–)2–12	> 3
2	Peduncles 1–2 cm; corollas 2–3 mm; anthers 2 mm; cypselae 3.5–4 mm	Hymenopappus filifolius var. parvulus
2	Peduncles 2–10 cm; corollas 3–5 mm; anthers 2.5–3 mm; cypselae 4–6 mm	Hymenopappus filifolius var. nudipes
3	Terminal lobes of basal leaves 2–6 mm; phyllaries 3–7 mm; florets 10–30; corollas 2–3 mm	> 4
3	Terminal lobes of basal leaves (2–)3–50 mm; phyllaries (5–)6–14 mm; florets (15–)20–70+; corollas (2.5–)3–7 mm.	> 5
4	Plants 5–20 cm; cauline leaves 0–3; pappi 0.1–0.8 mm	Hymenopappus filifolius var. luteus
4	Plants 20–35 cm; cauline leaves 4–9; pappi 0.5–1.5 mm	Hymenopappus filifolius var. pauciflorus
5	Corollas 4–7 mm, throat lengths (2–)3–8 times lobes; anthers 3–4 mm; cypselae 5–7 mm; pappi (1.2–)1.5–3 mm	> 6
5	Corollas 2.5–4.5 mm, throat lengths 2–4(–5) times lobes; anthers 2–3 mm; cypselae 4–6 mm; pappi 0.2–2(–3) mm	> 8
6	Peduncles 8–16 cm; corollas whitish; cypselahairs 0.5–1 mm	Hymenopappus filifolius var. eriopodus
6	Peduncles 2–12 cm; corollas yellowish; cypsela hairs 1–2 mm	> 7
7	Cauline leaves (1–)2–6; terminal lobes of basal leaves 5–30 mm; phyllaries 8–12(–14)mm	Hymenopappus filifolius var. megacephalus
7	Cauline leaves 0–3; terminal lobes of basal leaves 3–15 mm; phyllaries 6–10 mm	Hymenopappus filifolius var. lugens
8	Cauline leaves (2–)3–8; heads 5–60; corolla throats 1.3–1.8 mm	Hymenopappus filifolius var. polycephalus
8	Cauline leaves 0–5(–12); heads 1–10(–40); corolla throats 1.5–2.5 mm	> 9
9	Terminal lobes of basal leaves 3–6 mm; caul-ine leaves 5–12	Hymenopappus filifolius var. tomentosus
9	Terminal lobes of basal leaves 2–50 mm; cauline leaves 0–5	> 10
10	Plants 30–100 cm; terminal lobes of basal leaves 15–50 mm; pappi 0.2–1 mm	Hymenopappus filifolius var. filifolius
10	Plants 5–50 cm; terminal lobes of basal leaves 2–30 mm; pappi (0.6–)1–3 mm	> 11
11	Peduncles 3–15 cm; cypsela hairs 0.1–1 mm; pappi 1.5–3 mm	Hymenopappus filifolius var. nanus
11	Peduncles 1–6 cm; cypsela hairs 1–3 mm; pappi 0.6–2 mm	> 12
12	Cauline leaves 0–2; cypsela hairs 1 mm; pappi 0.6–1.3 mm	Hymenopappus filifolius var. idahoensis.
12	Cauline leaves (0–)2–4; cypsela hairs 1–3 mm; pappi 1.5–2 mm	Hymenopappus filifolius