Arctanthemum arcticum subsp. arcticum

Common names: Arctic daisy
Treatment appears in FNA Volume 19. Treatment on page 537. Mentioned on page 536.

Plants 10–40 cm (more in fruit). Stems sometimes branched. Leaves basal and cauline (cauline to beyond midstem, regularly distributed); basal and proximal: petioles 15–95 mm, blades fan-shaped to cuneate or spatulate, 15–50 × 4–35 mm, 3–5 (–7) -lobed; cauline: petioles 0–55 mm, blades 6–35 × 4–28 mm. Heads 1–2 (–3), 19–29 mm diam. (flattened, excluding rays). Peduncular bracts 9–19 × 1–2 mm. Ray laminae (15–) 17–25 (–31) × (3.2–) 3.4–5.5 (–8.2) mm, veins (5–) 8–10 (–12).


Phenology: Flowering summer.
Habitat: Open, coastal, wet, brackish habitats on clay, sand, gravel or rocks, upper tidal marshes, brackish coastal meadows, coastal herbaceous or heath tundras, sloughs, coastal rocks, flood plains and bars at mouths of streams
Elevation: 0–10 m

Distribution

V19-933-distribution-map.gif

B.C., Alaska, ne Asia (Japan), ne Asia (Russian East Coast)

Discussion

Subspecies arcticum is coastal from northern Japan and Russia to North America as far as northwestern British Columbia. It is cultivated as an ornamental. The chromosome number 2n = 72 has been reported from Russia for the species; it is uncertain to what subspecies this number may belong. No report apparently exists for this subspecies in North America.

Selected References

None.

Lower Taxa

None.
not tailed +  and obtuse +
scarious +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Luc Brouillet +
(Linnaeus) Tzvelev in A. I. Tolmatchew +
0.6 cm6 mm <br />0.006 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
glabrescent +
attenuate +
Chrysanthemum arcticum +
compound +  and simple +
0.6 cm6 mm <br />0.006 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
3-5(-7)-lobed;fan-shaped;cuneate or spatulate +
4mm;28mm +
linear-lanceolate +  and linear +
Arctic daisy +
zygomorphic +, actinomorphic +  and (3-)5-merous +
yellow +  and white +
winged +  and monomorphic +
cylindro-obconic +
fertile +  and bisexual +
fertile +  and bisexual +
2.8 cm28 mm <br />0.028 m <br /> (4 cm40 mm <br />0.04 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (2.8 cm28 mm <br />0.028 m <br />) +
B.C. +, Alaska +, ne Asia (Japan) +  and ne Asia (Russian East Coast) +
0–10 m +
sheathing +  and clasping +
gland-dotted +
glabrescent +, woolly +  and glabrous +
mucronulate;obtuse;rounded +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Open, coastal, wet, brackish habitats on clay, sand, gravel or rocks, upper tidal marshes, brackish coastal meadows, coastal herbaceous or heath tundras, sloughs, coastal rocks, flood plains and bars at mouths of streams +
in 2s +  and singly +
indeterminate +
1.9 cm19 mm <br />0.019 m <br /> (?) +  and 2.9 cm29 mm <br />0.029 m <br /> (?) +
heterogamous +  and homogamous +
each +  and sessile +
1.3 cm13 mm <br />0.013 m <br /> (2.9 cm29 mm <br />0.029 m <br />) +
patelliform;hemispheric +
elliptic to oblong or oblong-lanceolate +  and lance-elliptic +
sessile +  and petiolate +
cauline +  and basal +
0.025 cm0.25 mm <br />2.5e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
yellow turning brownish +
deltate +
sheathing +  and clasping +
entire +  and dentate +
woolly +  and glabrous +
crenate +, mucronulate +, obtuse +  and rounded +
2-carpellate +
persistent +
0.9 cm9 mm <br />0.009 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0 cm0 mm <br />0 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
Flowering summer. +
25 +  and 34 +
in A. I. Tolmatchew, Fl. Arct. URSS +
2.5 cm25 mm <br />0.025 m <br /> (3.1 cm31 mm <br />0.031 m <br />) +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.82 cm8.2 mm <br />0.0082 m <br />) +
1.7 cm17 mm <br />0.017 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.34 cm3.4 mm <br />0.0034 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
bearing subulate enations +, hairy +  and bristly +
dome--shaped +
below-ground +
5 +  and 8 +
exalbuminous +
Illustrated +
appendaged +  and truncate +
papillate +
Dendranthema arctica +  and Leucanthemum arcticum +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Arctanthemum arcticum subsp. arcticum +
Arctanthemum arcticum +
subspecies +
yellow turning brownish +
campanulate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
sheathing +  and clasping +
woolly +  and glabrous +
mucronulate +, obtuse +  and rounded +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
greenish yellow +
cylindric +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
8 +  and 10 +
2.5 cm25 mm <br />0.025 m <br /> (5 cm50 mm <br />0.05 m <br />) +
cauline +, proximal +  and basal +
5 cm50 mm <br />0.05 m <br /> (40 cm400 mm <br />0.4 m <br />) +