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| 1 |
Leaves ± cauline and, often, basal; plants not or scarcely cespitose, not matted; heads (1–)2–25+ per stem |
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(2) |
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Leaves ± basal; plants cespitose or ± matted; heads 1(–3) per stem |
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(5) |
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| 2 (1) |
Subshrubs (usually); proximal indument (especially stems) persistent, whitish, densely lanuginose or pannose; largest leaf blades deltate to ovate, ± plane (California) |
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(3) |
| + |
Biennials or perennials (rarely slightly woody or flowering first year); proximal indument ± thinning with age, grayish, arachnoid to ± lanuginose; largest leaf blades ± elliptic or lanceolate to ovate, plane or ± 3-dimensional |
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(4) |
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| 3 (2) |
Phyllaries: longest 10–13 mm, outer predominantly arachnoid to closely lanuginose (sparsely, if at all, stipitate-glandular) |
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3 Chaenactis parishii |
| + |
Phyllaries: longest 14–18 mm, outer predominantly stipitate-glandular (other indument none or sparse) |
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4 Chaenactis suffrutescens (in part) |
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| 4 (2) |
Outer phyllaries usually densely, sometimes sparsely or obscurely, stipitate-glandular and, often, arachnoid, lanuginose, and/or villous; largest leaf blades ± 3-dimensional, usually 2-pinnately lobed, primary lobes ± congested, ultimate lobes ± involute and/or twisted |
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6 Chaenactis douglasii (in part) |
| + |
Outer phyllaries closely lanuginose, not stipitate-glandular; largest leaf blades ± plane, 1-pinnately lobed, lobes remote, ± plane (Washington) |
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8 Chaenactis thompsonii |
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| 5 (1) |
Outer phyllaries predominantly arachnoid, sericeous, or ± lanuginose (sparsely, if at all, stipitate-glandular) |
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(6) |
| + |
Outer phyllaries predominantly or evidently stipitate-glandular (other indument none, sparse, or ± arachnoid) |
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(8) |
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| 6 (5) |
Cypselae sparsely glandular amidst other indument; largest leaf blades 2-pinnately lobed (± 3-dimensional, primary lobes 4–12 pairs, peduncles mostly ascending to erect) |
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6 Chaenactis douglasii (in part) |
| + |
Cypselae eglandular; largest leaf blades (0–)1(–2)-pinnately or -subpalmately lobed (± plane, and/or primary lobes 0–4 pairs, and/or peduncles mostly prostrate) |
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(7) |
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| 7 (6) |
Longest pappus scales 2.5–4.5 mm (lengths 0.4–0.8 times corollas); leaf blades ± plane; peduncles mostly ascending to erect; Idaho |
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9 Chaenactis evermannii |
| + |
Longest pappus scales 5–8 mm (lengths 0.9–1 times corollas); leaf blades ± plane or 3-dimensional; peduncles mostly prostrate; California, Nevada |
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10 Chaenactis alpigena |
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| 8 (5) |
Largest leaf blades deltate to ovate, ± plane, ultimate lobes ± plane |
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(9) |
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Largest leaf blades linear-cylindric to ± elliptic or slightly ovate, ± 3-dimensional, ultimate lobes ± involute and/or twisted |
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(10) |
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| 9 (8) |
Plants 2–10(–12) cm; leaves 2.5–5 cm; longest phyllaries 9–12(–14) mm; corol-las 5.5–8 mm; longest pappus scales 3–5 mm |
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5 Chaenactis nevadensis |
| + |
Plants (10–)25–45(–60) cm; leaves 5–10 cm; longest phyllaries 14–18 mm; corollas 8.5–10 mm; longest pappus scales 7–9 mm |
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4 Chaenactis suffrutescens (in part) |
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| 10 (8) |
Largest leaf blades ± elliptic to slightly ovate, primary lobes (4–)5–9(–12) pairs, ± congested, scarcely imbricate; not s California |
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6 Chaenactis douglasii (in part) |
| + |
Largest leaf blades linear-cylindric to ± fusiform, primary lobes (7–)10–18+ pairs, ± imbricate; s California |
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7 Chaenactis santolinoides |
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