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Key to ArtemisiaView taxon page for Artemisia
(For a list of species in Artemisia, use the above link.) Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots. 1. Annual to perennial  Completing life cycle (germination through death) in more than two years or growing seasons, generally non-woody (at least above ground) to woody; includes perennial herbs as well as subshrubs to trees; the abbreviation 'per' only refers to perennial herb, not to the word 'perennial' alone. herb, base sometimes woody; axillary  Pertaining to or within an axil, especially a leaf axil. leaf  Organ arising from a stem, generally composed of a stalk (petiole) and a flat, expanded, green, photosynthetic area (blade); distinguished from a leaflet by the presence in its axil of a bud, branch, thorn, or flower; sometimes with lateral, basal appendages (stipules); either simple (toothed, lobed, or dissected but not divided into leaflets) or compound (divided into leaflets). clusters generally 0 3. Leaves generally 1–8 cm wide, ± glabrous to sparsely tomentose  Covered with densely interwoven, generally matted hairs. adaxially, glabrous or hairy abaxially; stems 3–25 dm 4. Proximal-most leaves 2-pinnately divided, lateral lobes  1. A major expansion or bulge, such as on the margin of a leaf, sepal, or petal, or on the surface of an ovary. 2. The free tips of otherwise fused structures, such as sepals or petals; larger than teeth. acute  Having a short-tapered, sharp tip, the sides convex or straight and converging at less than a right angle. ; leaves generally glabrous adaxially, tomentose (or becoming glabrous) abaxially 5' Plant strongly lemon-scented; phyllaries often ± purple and dotted with yellow glands, generally ± glabrous ..... A. michauxiana 4' Leaves entire  Having margins that are continuous and smooth (i.e., without teeth, lobes, etc.). to pinnately lobed, lateral lobes obtuse  Having a short-tapered, blunt tip or base, the sides convex or straight and converging at more than a right angle. to acute, glabrous to ± sparsely tomentose adaxially, densely tomentose abaxially 6. Involucre bell-shaped, 2–4 mm diam; phyllaries gray-hairy, ± widely (ob)ovate; flowers > 15; leaves green to gray-green adaxially; widespread ..... A. douglasiana 6' Involucre narrow, <= 2 mm diam; phyllaries ± yellow, glabrous to sparsely hairy, oblong  Longer than wide, with nearly parallel sides; wider than linear. to ± ovate  Egg-shaped (i.e., widest below the middle) in two dimensions (i.e., in one plane), as a leaf. ; flowers < 15; leaves dark green adaxially; NCo, s ChI ..... A. suksdorfii 3' Leaves 0.5–1(4) cm wide, densely gray-hairy (or becoming ± glabrous adaxially); stems 2–8(12) dm ..... A. ludoviciana 7. Inflorescence generally open, occasionally dense and narrow; leaves generally 1–2 cm ..... subsp. albula 7' Inflorescence dense, narrow; leaves generally 2–11 cm 8' Leaves deeply 1–2-divided into narrow lobes 10. Stem hairy, branched from base, from basal  At or near the base of a plant or plant part. Especially said of leaves clustered near the ground or of a placenta confined to the base of an ovary. leaf cluster 11' Leaves glabrous to densely silky-hairy; phyllaries sparsely hairy, margins dark or scarious; montane 12. Phyllary margins scarious; involucre  Group of bracts more or less held together as a unit, subtending a flower, fruit (acorn cup), or inflorescence. 3.5–4 mm diam; biennial or perennial herb from taproot; heads generally erect  Upright; vertically oriented. in spike- or narrowly panicle-like clusters ..... A. borealis subsp. borealis 12' Phyllary margins ± black; involucre (4)7–11 mm diam; perennial herb from branched caudex  Generally short, sometimes woody, more or less vertical stem of a perennial, at or beneath ground level. ; heads nodding, slender-peduncled in raceme-like or few-branched, panicle-like cluster ..... A. norvegica subsp. saxatilis 10' Stem generally glabrous, simple  Composed of a single part; undivided; unbranched. , basal leaves 0 13. Biennial or perennial herb; leaves entire to 1-pinnately lobed 14. Leaves linear  Elongate, with nearly parallel sides; narrower than elliptic or oblong. , entire or with few linear lobes; heads disciform, disk flowers staminate; receptacle epaleate; widespread ..... A. dracunculus 14' Leaves deeply and coarsely pinnately 3–7-lobed; heads discoid; receptacle paleate; SCo, PR ..... A. palmeri 13' Annual or biennial; stem erect; leaves 2–3-pinnately divided 1' Subshrub or shrub; axillary leaf clusters present 16. Plant spiny, compact; inflorescence short, heads ± hidden by leaves; leaves palmately 2–5-divided; flower spring/early summer ..... A. spinescens 16' Plant unarmed, compact to tall; inflorescence long, heads not hidden by leaves; leaf lobes 0–5; flowering late summer/fall 17. Leaves (1)2–10 cm, linear, often ± thread-like or lobes <= 3 mm wide, generally > 1 cm 17' Leaves 0.3–2(6) cm, generally oblong or wedge-shaped (to linear), generally > 3 mm wide, entire to shallowly 3-lobed at tip, lobes < 1 cm 19. Heads nodding; leaves not clustered, entire or teeth or lobes 3, sharply pointed – W&I, DMoj ..... A. bigelovii 19' Heads erect; leaves often in axillary clusters, entire or teeth 3(6), rounded to acute 20' Leaves generally wedge-shaped, generally 3-toothed or -lobed (entire or 6-toothed in Artemisia spiciformis), persistent in winter; heads generally < 5 mm wide (4.5–6 mm in Artemisia spiciformis) 21. Plant generally < 4 dm; inflorescence narrow, generally < 3 cm wide 22. Heads short-peduncled; involucre generally 1–2 mm diam 23. Phyllaries shiny-resinous, straw-colored; leaves of flower-stems generally entire ..... A. nova 22' Heads ± sessile  Without a petiole, peduncle, pedicel, or other kind of stalk. ; involucre 2–4.5 mm diam, gray-hairy ..... A. arbuscula 24. Flowers 3–6 per head  1. A dense, often spheric inflorescence of sessile or subsessile flowers. 2. In Asteraceae and some other groups, a head-like inflorescence is one in which sessile or subsessile inflorescence units (e.g., heads in Asteraceae, umbels enclosed by involucres in Eriogonum), instead of individual flowers, are attached in a short dense cluster without an evident axis or branches. 24' Flowers 8–23 per head 21' Plant generally > 4 dm; inflorescence generally > 3 cm wide 27. Heads >= 3 mm diam; plant sticky-resinous; meadows, c&s SNH, SnGb, SnBr, n SNE, W&I ..... A. rothrockii (2) 27' Heads generally < 3 mm diam (generally 4.5–6 mm in Artemisia spiciformis); plant not sticky; mtns, dry valleys, widespread 28. Leaves entire to irregularly 3–6-toothed, partly deciduous; plant sprouting from roots; moist slopes, rocky meadows, SNH, W&I > 2000 m ..... A. spiciformis (2) 28' Leaves generally regularly 3-lobed or toothed at tip, wedge-shaped, evergreen; plant not root-sprouting; widespread ..... A. tridentata (in part) 29. Plants with a flat-topped crown; inflorescence rising above truncate  Abruptly (not gradually) narrower or smaller at base or tip, as if cut straight across or nearly so. vegetative portion, narrow, branches generally erect ..... subsp. vaseyana 29' Plants with a rounded crown; inflorescence amongst as well as surpassing distal-most vegetative branches, widely branching, branches erect to spreading  Oriented more or less perpendicularly to the axis of attachment; often, more or less horizontal. or drooping
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Citation for the whole project: Jepson Flora Project (eds.) . Jepson eFlora, https://ucjeps.berkeley.edu/eflora/ [accessed on ]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on .
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