Artemisia subg. Artemisia
usually not wandlike (wandlike in A. californica, A. nesiotica, A. palmeri).
usually deciduous, rarely persistent, basal (rosettes) and/or cauline (not in fascicles).
glabrous (paleate in A. palmeri).
usually peripheral 3–20 pistillate and fertile (0 pistillate in A. nesiotica, A. palmeri);
central (or all) 14–70 bisexual and fertile;
corollas funnelform.
usually disciform (discoid in A. nesiotica and A. palmeri).
Artemisia subg. Artemisia
Widespread in Northern Hemisphere; especially North America; Europe; and central and northern Asia; sporadic in South America and northern Africa
Species ca. 220 (27 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Subshrubs or shrubs (stems wandlike) | → 2 |
1. Annuals, biennials, perennials, subshrubs, or shrubs (stems sometimes brittle, not wandlike) | → 4 |
2. Plants 100–350 cm; leaves relatively deeply and coarsely pinnately lobed (lobes 3–7+; coastal California and Baja California) | A. palmeri |
2. Plants 10–250 cm; leaves pinnately lobed or 3-lobed | → 3 |
3. Shrubs (20–250 cm); leaves pinnately lobed (lobes 0.5–1 mm wide); California (chaparral) | A. californica |
3. Subshrubs (10–60 cm, stems mostly prostrate); leaves 3-lobed (lobes 1–2 mm wide); Channel Islands, California | A. nesiotica |
4. Annuals or biennials; leaves among heads (relatively deeply) lobed | → 5 |
4. Perennials, subshrubs, or shrubs; leaves among heads mostly entire | → 6 |
5. Annuals, 30–200(–300) cm, sweetly aromatic; leaves 2–3-pinnatifid; arrays of heads 10–20 cm diam | A. annua |
5. Annuals or biennials, (10–)30–80(–150) cm, not aromatic; leaves 1–2-pinnately lobed; arrays of heads 2–4 cm diam | A. biennis |
6. Perennials, subshrubs, or shrubs (not rhizomatous) | → 7 |
6. Perennials (usually rhizomatous, stems sometimes woody at bases) | → 15 |
7. Heads in capitate or dense, corymbiform arrays (plants cespitose) | → 8 |
7. Heads in paniculiform or racemiform arrays (plants not cespitose) | → 10 |
8. Leaves pinnately lobed; involucres 3–5 mm diam.; phyllaries lanceolate to ovate (margins white) | A. senjavinensis |
8. Leaves 1–2-palmatifid; involucres 3.5–11 mm diam.; phyllaries lanceolate (margins brown or white) | → 9 |
9. Involucres 3.5–6 × 6–11 mm; phyllaries lanceolate (margins brown); corollas yellow or reddish black, glabrous or glandular (not pilose). | A. globularia |
9. Involucres 3–4 × 3.5–5 mm; phyllaries lanceolate (margins white); corollas yellow, glabrous or pilose | A. glomerata |
10. Leaves entire, irregularly palmatifid, or palmately 3-lobed to 2-ternately lobed | → 11 |
10. Leaves 2–3-pinnatifid | → 13 |
11. Pappi coroniform; Idaho, Nevada, Oregon | A. papposa |
11. Pappi 0; Alberta, British Columbia, Northwest Territories, Nunavut; Alaska, Washington | → 12 |
12. Plants 15–70 cm; leaves palmately 3-lobed to 2-ternately lobed. | A. alaskana |
12. Plants (5–)10–40 cm; leaves 1–3-palmately lobed | A. furcata |
13. Perennials or subshrubs, 50–170 cm (widely branched, stems brittle); leaf lobes less than 1 mm wide; heads erect; involucres 1.5–3 mm diam. (gardens, waste places, much of North America) | A. abrotanum |
13. Perennials, 10–50 cm (erect, stems not brittle); leaf lobes 1+ mm wide (margins coarsely toothed); heads nodding; involucres 4–10 mm diam | → 14 |
14. Peduncles 0 or to 10 mm | A. laciniata |
14. Peduncles to 50 mm | A. norvegica |
15. Leaves entire, serrate, toothed, or lobed (sinuses to 1/2 blade widths) | → 16 |
15. Leaves (relatively deeply) lobed (sinuses 1/2+ blade widths) | → 22 |
16. Plants 20–50(–80, rarely more) cm | → 17 |
16. Plants 50–300 cm | → 19 |
17. Leaves usually entire, sometimes toothed or lobed; involucres 4–5 mm diam | A. longifolia |
17. Leaves usually lobed, sometimes entire; involucres (1–)2–5 mm diam | → 18 |
18. Involucres 2–4(–5.5) mm; phyllaries (gray-green) densely tomentose | A. ludoviciana |
18. Involucres 3.5–4 mm; phyllaries (violet-brown) sparsely tomentose (w North America) | A. tilesii |
19. Phyllaries glabrous or sparsely hairy (coast, n California to British Columbia) | A. suksdorfii |
19. Phyllaries usually densely hairy | → 20 |
20. Leaves densely hairy (both faces, broadly lanceolate, mostly entire, the proximal lobed; w North America, mostly inland grasslands). | A. douglasiana |
20. Leaves (bicolor) hairy abaxially, glabrate or glabrous adaxially | → 21 |
21. Leaves serrate (teeth ca. 2 mm; inland grasslands and barren areas, high plains) | A. serrata |
21. Leaves mostly deeply lobed (lobes 4–20 mm; mostly e North America, introduced w coast) | A. vulgaris |
22. Leaves not bicolor (both faces bright green or silvery), lobes acute or rounded | → 23 |
22. Leaves bicolor (abaxial faces silvery, adaxial green), lobes acute | → 25 |
23. Leaves silver-gray, lobes rounded (coastal dunes) | A. stelleriana |
23. Leaves bright green, lobes acute (not coastal dunes) | → 24 |
24. Involucres (4–)5–8 × 4–10 mm; 0–3800 m | A. norvegica |
24. Involucres 2.5–3.5 × 2–4.5 mm; 100–2400 m | A. packardiae |
25. Plants 30–100 cm, lemon-scented; heads usually erect (subalpine and alpine). | A. michauxiana |
25. Plants 15–70 cm, not lemon-scented; heads usually nodding | → 26 |
26. Perennials (widely spreading, stems brittle); garden escapes, c, e North America. | A. pontica |
26. Biennials or perennials (erect) | → 27 |
27. Leaves pinnatifid (lobes 3–5, 0.5–1 mm wide); grasslands or deserts, 600– 2900 m | A. carruthii |
27. Leaves 2–3-pinnately lobed (lobes elliptic, 2–6 mm wide); w mountains, 2200–3100 m | A. franserioides |
