| 1 |
Subshrubs or shrubs (stems wandlike) |
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(2) |
| + |
Annuals, biennials, perennials, subshrubs, or shrubs (stems sometimes brittle, not wandlike) |
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(4) |
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| 2 (1) |
Plants 100–350 cm; leaves relatively deeply and coarsely pinnately lobed (lobes 3–7+; coastal California and Baja California) |
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42 Artemisia palmeri |
| + |
Plants 10–250 cm; leaves pinnately lobed or 3-lobed |
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(3) |
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| 3 (2) |
Shrubs (20–250 cm); leaves pinnately lobed (lobes 0.5–1 mm wide); California (chaparral) |
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28 Artemisia californica |
| + |
Subshrubs (10–60 cm, stems mostly prostrate); leaves 3-lobed (lobes 1–2 mm wide); Channel Islands, California |
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39 Artemisia nesiotica |
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| 4 (1) |
Annuals or biennials; leaves among heads (relatively deeply) lobed |
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(5) |
| + |
Perennials, subshrubs, or shrubs; leaves among heads mostly entire |
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(6) |
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| 5 (4) |
Annuals, 30–200(–300) cm, sweetly aromatic; leaves 2–3-pinnatifid; arrays of heads 10–20 cm diam |
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26 Artemisia annua |
| + |
Annuals or biennials, (10–)30–80(–150) cm, not aromatic; leaves 1–2-pinnately lobed; arrays of heads 2–4 cm diam |
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27 Artemisia biennis |
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| 6 (4) |
Perennials, subshrubs, or shrubs (not rhizomatous) |
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(7) |
| + |
Perennials (usually rhizomatous, stems sometimes woody at bases) |
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(15) |
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| 7 (6) |
Heads in capitate or dense, corymbiform arrays (plants cespitose) |
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(8) |
| + |
Heads in paniculiform or racemiform arrays (plants not cespitose) |
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(10) |
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| 8 (7) |
Leaves pinnately lobed; involucres 3–5 mm diam.; phyllaries lanceolate to ovate (margins white) |
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45 Artemisia senjavinensis |
| + |
Leaves 1–2-palmatifid; involucres 3.5–11 mm diam.; phyllaries lanceolate (margins brown or white) |
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(9) |
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| 9 (8) |
Involucres 3.5–6 × 6–11 mm; phyllaries lanceolate (margins brown); corollas yellow or reddish black, glabrous or glandular (not pilose). |
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33 Artemisia globularia |
| + |
Involucres 3–4 × 3.5–5 mm; phyllaries lanceolate (margins white); corollas yellow, glabrous or pilose |
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34 Artemisia glomerata |
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| 10 (7) |
Leaves entire, irregularly palmatifid, or palmately 3-lobed to 2-ternately lobed |
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(11) |
| + |
Leaves 2–3-pinnatifid |
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(13) |
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| 11 (10) |
Pappi coroniform; Idaho, Nevada, Oregon |
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43 Artemisia papposa |
| + |
Pappi 0; Alberta, British Columbia, Northwest Territories, Nunavut; Alaska, Washington |
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(12) |
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| 12 (11) |
Plants 15–70 cm; leaves palmately 3-lobed to 2-ternately lobed. |
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25 Artemisia alaskana |
| + |
Plants (5–)10–40 cm; leaves 1–3-palmately lobed |
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32 Artemisia furcata |
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| 13 (10) |
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) |
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24 Artemisia abrotanum |
| + |
Perennials, 10–50 cm (erect, stems not brittle); leaf lobes 1+ mm wide (margins coarsely toothed); heads nodding; involucres 4–10 mm diam |
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(14) |
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| 14 (13) |
Peduncles 0 or to 10 mm |
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35 Artemisia laciniata |
| + |
Peduncles to 50 mm |
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40 Artemisia norvegica |
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| 15 (6) |
Leaves entire, serrate, toothed, or lobed (sinuses to 1/2 blade widths) |
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(16) |
| + |
Leaves (relatively deeply) lobed (sinuses 1/2+ blade widths) |
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(22) |
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| 16 (15) |
Plants 20–50(–80, rarely more) cm |
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(17) |
| + |
Plants 50–300 cm |
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(19) |
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| 17 (16) |
Leaves usually entire, sometimes toothed or lobed; involucres 4–5 mm diam |
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36 Artemisia longifolia |
| + |
Leaves usually lobed, sometimes entire; involucres (1–)2–5 mm diam |
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(18) |
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| 18 (17) |
Involucres 2–4(–5.5) mm; phyllaries (gray-green) densely tomentose |
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37 Artemisia ludoviciana |
| + |
Involucres 3.5–4 mm; phyllaries (violet-brown) sparsely tomentose (w North America) |
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49 Artemisia tilesii |
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| 19 (16) |
Phyllaries glabrous or sparsely hairy (coast, n California to British Columbia) |
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48 Artemisia suksdorfii |
| + |
Phyllaries usually densely hairy |
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(20) |
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| 20 (19) |
Leaves densely hairy (both faces, broadly lanceolate, mostly entire, the proximal lobed; w North America, mostly inland grasslands). |
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30 Artemisia douglasiana |
| + |
Leaves (bicolor) hairy abaxially, glabrate or glabrous adaxially |
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(21) |
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| 21 (20) |
Leaves serrate (teeth ca. 2 mm; inland grasslands and barren areas, high plains) |
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46 Artemisia serrata |
| + |
Leaves mostly deeply lobed (lobes 4–20 mm; mostly e North America, introduced w coast) |
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50 Artemisia vulgaris |
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| 22 (15) |
Leaves not bicolor (both faces bright green or silvery), lobes acute or rounded |
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(23) |
| + |
Leaves bicolor (abaxial faces silvery, adaxial green), lobes acute |
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(25) |
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| 23 (22) |
Leaves silver-gray, lobes rounded (coastal dunes) |
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47 Artemisia stelleriana |
| + |
Leaves bright green, lobes acute (not coastal dunes) |
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(24) |
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| 24 (23) |
Involucres (4–)5–8 × 4–10 mm; 0–3800 m |
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40 Artemisia norvegica |
| + |
Involucres 2.5–3.5 × 2–4.5 mm; 100–2400 m |
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41 Artemisia packardiae |
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| 25 (22) |
Plants 30–100 cm, lemon-scented; heads usually erect (subalpine and alpine). |
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38 Artemisia michauxiana |
| + |
Plants 15–70 cm, not lemon-scented; heads usually nodding |
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(26) |
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| 26 (25) |
Perennials (widely spreading, stems brittle); garden escapes, c, e North America. |
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44 Artemisia pontica |
| + |
Biennials or perennials (erect) |
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(27) |
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| 27 (26) |
Leaves pinnatifid (lobes 3–5, 0.5–1 mm wide); grasslands or deserts, 600– 2900 m |
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29 Artemisia carruthii |
| + |
Leaves 2–3-pinnately lobed (lobes elliptic, 2–6 mm wide); w mountains, 2200–3100 m |
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31 Artemisia franserioides |
