Difference between revisions of "Artemisia campestris"
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|distribution=North America;especially mountains and high latitudes;Eurasia. | |distribution=North America;especially mountains and high latitudes;Eurasia. | ||
|discussion=<p>Subspecies ca. 7 (3 in the flora).</p><!-- | |discussion=<p>Subspecies ca. 7 (3 in the flora).</p><!-- | ||
| − | --><p><i>Artemisia campestris</i> varies; each morphologic form grades into another. The present circumscription is conservative in that only three subspecies are recognized; the subspecies usually can be separated geographically as well as morphologically. Populations in western North America consist primarily of <i></i>subsp.<i> pacifica</i>; east of the continental divide, plants are assigned to <i></i>subsp.<i> canadensis</i> in northern latitudes and to <i></i>subsp.<i> caudata</i> in southern latitudes.</p> | + | --><p><i>Artemisia campestris</i> varies; each morphologic form grades into another. The present circumscription is conservative in that only three subspecies are recognized; the subspecies usually can be separated geographically as well as morphologically. Populations in western North America consist primarily of <i></i></i>subsp.<i><i> pacifica</i>; east of the continental divide, plants are assigned to <i></i></i>subsp.<i><i> canadensis</i> in northern latitudes and to <i></i></i>subsp.<i><i> caudata</i> in southern latitudes.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year=1753 | |publication year=1753 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V19_852.xml |
|tribe=Asteraceae tribe Anthemideae | |tribe=Asteraceae tribe Anthemideae | ||
|genus=Artemisia | |genus=Artemisia | ||
Revision as of 18:39, 24 September 2019
Biennials or perennials, (10–)30–80(–150) cm, faintly aromatic; taprooted, caudices branched. Stems usually 1–5, turning reddish brown, (often ribbed) tomentose or glabrous. Leaves persistent or deciduous, mostly basal; basal blades 4–12 cm, cauline gradually reduced, 2–4 × 0.5–1.5 cm, 2–3-pinnately lobed, lobes linear to narrowly oblong, apices acute, faces densely to sparsely white-pubescent. Heads (pedunculate) in (mostly leafless) paniculiform arrays. Involucres broadly turbinate, 2.5–3(–5) × 2–3.5(–7) mm. Phyllaries (margins scarious) glabrous or villous-tomentose. Florets: pistillate 5–20; functionally staminate 12–30; corollas pale yellow, sparsely hairy or glabrous. Cypselae oblong-lanceoloid, somewhat compressed, 0.8–1 mm, faintly nerved, glabrous.
Distribution
North America, especially mountains and high latitudes, Eurasia.
Discussion
Subspecies ca. 7 (3 in the flora).
Artemisia campestris varies; each morphologic form grades into another. The present circumscription is conservative in that only three subspecies are recognized; the subspecies usually can be separated geographically as well as morphologically. Populations in western North America consist primarily of subsp. pacifica; east of the continental divide, plants are assigned to subsp. canadensis in northern latitudes and to subsp. caudata in southern latitudes.
Selected References
None.
Lower Taxa
Key
| 1 | Perennials; stems 2–5; basal rosettes persistent | Artemisia campestris subsp. pacifica |
| 1 | Biennials; stems 1(–3); basal rosettes not persistent (withering before flowering) | > 2 |
| 2 | Involucres globose, 3–4 × 3.5–5 mm; n of 50°, primarily Canada | Artemisia campestris subsp. canadensis |
| 2 | Involucres turbinate, 2–3 × 2–3 mm; s of 50°, e from Rocky Mountains to coastal North America | Artemisia campestris subsp. caudata |