treatments/ARTEMISIA (subg. ARTEMISIA ) sect. Abrotanum

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ARTEMISIA  (subg. ARTEMISIA )  sect. Abrotanum {{{publication_title}}} {{{place_in_publication}}}



Annuals, biennials, or perennials (shrubs in A. californica, subshrubs in A. nesiotica); usually fibrous-rooted, sometimes taprooted, caudices sometimes woody, rhizomes sometimes present. Stems usually not wandlike (wandlike in A. californica, A. nesiotica, A. palmeri). Leaves usually deciduous, rarely persistent, basal (rosettes) and/or cauline (not in fascicles). Heads usually disciform (discoid in A. nesiotica and A. palmeri). Receptacles glabrous (paleate in A. palmeri). Florets: usually peripheral 3–20 pistillate and fertile (0 pistillate in A. nesiotica, A. palmeri); central (or all) 14–70 bisexual and fertile; corollas funnelform.


Species ca. 220 (27 in the flora):widespread in Northern Hemisphere; especially North America; Europe; and central and northern Asia; sporadic in South America and northern Africa.;


SELECTED REFERENCES
Estes, J. R. 1969. Evidence for autoploid evolution in the Artemisia ludoviciana complex of the Pacific Northwest. Brittonia 21: 29–43.Keck, D. D. 1946. A revision of the Artemisia vulgaris complex in North America. Proc. Calif. Acad. Sci., ser. 4, 25: 421–468.


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