Difference between revisions of "Arctanthemum arcticum"
in A. I. Tolmatchew, Fl. Arct. URSS 10: 115. 1987.
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|name=Chrysanthemum arcticum | |name=Chrysanthemum arcticum | ||
|authority=Linnaeus | |authority=Linnaeus | ||
| + | |rank=species | ||
|publication_title=Sp. Pl. | |publication_title=Sp. Pl. | ||
|publication_place=2: 889. 1753 | |publication_place=2: 889. 1753 | ||
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|name=Dendranthema arctica | |name=Dendranthema arctica | ||
|authority=(Linnaeus) Tzvelev | |authority=(Linnaeus) Tzvelev | ||
| + | |rank=species | ||
}} {{Treatment/ID/Synonym | }} {{Treatment/ID/Synonym | ||
|name=Leucanthemum arcticum | |name=Leucanthemum arcticum | ||
|authority=(Linnaeus) de Candolle | |authority=(Linnaeus) de Candolle | ||
| + | |rank=species | ||
}} | }} | ||
|hierarchy=Asteraceae;Asteraceae tribe Anthemideae;Arctanthemum;Arctanthemum arcticum | |hierarchy=Asteraceae;Asteraceae tribe Anthemideae;Arctanthemum;Arctanthemum arcticum | ||
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|distribution=Coastal Alaska and low-arctic Canada;arctic Eurasia;ne Asia (s to Japan). | |distribution=Coastal Alaska and low-arctic Canada;arctic Eurasia;ne Asia (s to Japan). | ||
|discussion=<p>Subspecies 2 (2 in the flora).</p><!-- | |discussion=<p>Subspecies 2 (2 in the flora).</p><!-- | ||
| − | --><p>When Hultén described Chrysanthemum arcticum < | + | --><p>When Hultén described Chrysanthemum arcticum <i></i>subsp.<i> polare</i>, he mapped the two subspecies. Along the Bering Strait in Alaska, all the material appears to belong to <i></i>subsp.<i> polare</i>, except at Norton Bay, where a specimen (ALA) could be attributed to <i></i>subsp.<i> arcticum</i>. That population would be very disjunct from the range of the subspecies along the south coast of Alaska. The two subspecies do not overlap widely in North America.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Arctanthemum arcticum | name=Arctanthemum arcticum | ||
| − | |||
|authority=(Linnaeus) Tzvelev in A. I. Tolmatchew | |authority=(Linnaeus) Tzvelev in A. I. Tolmatchew | ||
|rank=species | |rank=species | ||
| Line 67: | Line 69: | ||
|publication year=1987 | |publication year=1987 | ||
|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/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V19-20-21/V19_932.xml |
|tribe=Asteraceae tribe Anthemideae | |tribe=Asteraceae tribe Anthemideae | ||
|genus=Arctanthemum | |genus=Arctanthemum | ||
Revision as of 19:22, 16 December 2019
Perennials, forming tufts of 1–10+ rosettes; rhizomes at or below ground, fleshy, tough, branched; taproots (young plants) 3–6(–10) mm diam. Stems glabrous or sparsely woolly proximally to ± densely white-woolly near heads. Leaves sometimes glaucous; petioles 0–95 mm; bases cuneate to truncate, sheathing to clasping (distal), margins revolute, teeth obtuse to rounded, sometimes mucronulate, faces glabrous or sparsely woolly, glabrescent; basal and proximal cauline blades ± fan-shaped to cuneate or spatulate, 6–50 × 4–35 mm, lobes usually 3–7, apices blunt; distal blades linear, 4–35 × 1–28(–40) mm, bases attenuate, margins crenate, dentate, or entire, apices acute or obtuse; faces ± woolly, glabrescent. Peduncles usually bracteate, bracts 0–4, linear-lanceolate to linear, 6–19 mm. Ray laminae 8–12 mm. Disc corollas: tubes greenish yellow, (1.1–)1.4–2 mm, throats and lobes yellow turning brownish, throats 0.7–1 mm, sometimes very sparsely glandular, lobes (0.25–)0.4–0.6 mm. Cypselae 1.5–2.5 mm. 2n = 18 (72?).
Distribution
Coastal Alaska and low-arctic Canada, arctic Eurasia, ne Asia (s to Japan).
Discussion
Subspecies 2 (2 in the flora).
When Hultén described Chrysanthemum arcticum subsp. polare, he mapped the two subspecies. Along the Bering Strait in Alaska, all the material appears to belong to subsp. polare, except at Norton Bay, where a specimen (ALA) could be attributed to subsp. arcticum. That population would be very disjunct from the range of the subspecies along the south coast of Alaska. The two subspecies do not overlap widely in North America.
Selected References
None.
Key
| 1 | Plants 10–40 cm (more in fruit); stems sometimes branched; blades of basal leaves fan-shaped to cuneate or spatulate, 3–5(–7)-lobed; ray laminae (15–)17–25(–31) mm, veins (5–)8–10(–12) | Arctanthemum arcticum subsp. arcticum |
| 1 | Plants (2.5–)5–20(–26) cm (more in fruit); stems not branched; blades of basal leaves cuneate to spatulate, 0–3-lobed; ray laminae (7–)9–18(–21) mm, veins 4–5(–7) | Arctanthemum arcticum subsp. polare |