Packera hyperborealis

(Greenman) Á. Löve & D. Löve

Bot. Not. 128: 520. 1976.

Common names: Northern groundsel
Endemic
Basionym: Senecio hyperborealis Greenman Ann. Missouri Bot. Gard. 1: 264. 1914
Treatment appears in FNA Volume 20. Treatment on page 589. Mentioned on page 571, 575.

Perennials, 6–20+ cm; fibrous-rooted or rhizomatous (rhizomes horizontal to suberect, stout). Stems usually 1, sometimes multiple, bases and leaf-axils tomentose, otherwise glabrous. Basal leaves (and proximal cauline) petiolate; blades oblanceolate to obovate or lyrate (pinnately lobed to pinnatifid, terminal lobes larger than laterals), 10–30+ × 10–20+ mm, bases tapering, ultimate margins ± crenate to serrate. Cauline leaves gradually to abruptly reduced (sessile; pinnatisect or entire). Heads 1–2 (–5+) in cymiform arrays. Peduncles bracteate (bractlets purple-tinged), glabrous or glabrate. Calyculi 0 or inconspicuous (bractlets purple-tinged). Phyllaries 13, green (sometimes purple-tinged distally), 6–8 mm, glabrous. Ray-florets 0 (rarely) or 10–12; corolla laminae 8–10 mm. Disc-florets 45–60+; corolla-tubes 3.5–4 mm, limbs 3–3.5 mm. Cypselae 1.5–2.5 mm, hirtellous on ribs; pappi 6–7 mm. 2n = 46.


Phenology: Flowering mid Jun–early Aug.
Habitat: Open, dry, rocky or sandy areas, sometimes in fertile soils overlaying limestone
Elevation: 0–900 m

Distribution

V20-1315-distribution-map.gif

N.W.T., Nunavut, Yukon, Alaska.

Discussion

Packera hyperborealis is known only from lowland tundra from Alaska to the Mackenzie River and as far south as the northern end of the Franklin Mountains. It has also been collected as far north as Banks Island.

Selected References

None.

Lower Taxa

None.
... more about "Packera hyperborealis"
not tailed +, rounded +  and obtuse +
papillate +
truncate-penicillate +
scarious +
usually ovate +  and lance-linear +
indeterminate +  and determinate +
Debra K. Trock +
(Greenman) Á. Löve & D. Löve +
glabrous +  and tomentose +
tapering +
Senecio hyperborealis +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
oblanceolate;obovate or lyrate +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
winged;nerved;ribbed +
inconspicuous +
Northern groundsel +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
pale-yellow +  and deep orange-red +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
cylindric +
fertile +  and bisexual +
fertile +  and bisexual +
N.W.T. +, Nunavut +, Yukon +  and Alaska. +
0–900 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Open, dry, rocky or sandy areas, sometimes in fertile soils overlaying limestone +
discoid +  and radiate +
in compact or congested to open corymbiform cymiform or subumbelliform , , , arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
campanulate;cylindric +
glabrous +  and tomentose +
sessile +  and petiolate +
cauline +  and basal +
erect;recurved +
deltate +
dentate to pinnatifid +  and entire +
2-carpellate +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
glabrate +  and glabrous +
Flowering mid Jun–early Aug. +
linear +  and ensiform +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
bearing subulate enations +, hairy +  and bristly +
conic;usually flat;convex +
exalbuminous +
prostrate +  and ascending +
multiple +  and 1 +
appendaged +  and truncate +
papillate +
Compositae +
Packera hyperborealis +
species +
campanulate +
less crenate +  and serrate +
rhizomatous +  and fibrous-rooted +
6 cm60 mm <br />0.06 m <br /> (20 cm200 mm <br />0.2 m <br />) +
vine +, tree +, shrub +  and subshrub +
23 +, 22 +  and 20 +