Petasites frigidus var. frigidus

Illustrated
Synonyms: Petasites alaskanus Rydberg Petasites corymbosus (R. Brown) Rydberg Petasites frigidus var. hyperboreoides (Greene) Cronquist Petasites frigidus var. nivalis Petasites gracilis Greene Petasites hyperboreus Petasites nivalis Petasites nivalis subsp. hyperboreus (Rydberg) J. Toman
Treatment appears in FNA Volume 20. Treatment on page 638.

Basal leaves: blades palmately nerved, sagittate, deltate, or reniform to cordate, 2–25 × 2–27 cm, margins lobed (primary lobes 0–14, entire or dentate, secondary lobes 0–25, entire or irregularly toothed, lobed, or deeply parted, in extreme forms lobes with at least 2 lateral triangular teeth, lobes often overlapping, sinuses oblong and closed) or not lobed (dentate, teeth to 22 per side), abaxial faces floccose to woolly, adaxial faces mostly glabrous or sparsely tomentulose. Staminate heads 2–20; ray-florets 1–13, corolla laminae 1.6–12 mm; disc-floret style-branches 0.05–2 mm, papillate or hairy. Pistillate heads 5–19; ray-florets 30–109, corolla laminae 0.8–4.8 mm; disc-florets: corolla lobes 0.4–4.4 mm, style-branches 0–1.2 mm, papillate or hairy. Pappi (pistillate) to 15 mm. 2n = ca. 60, 90.


Phenology: Flowering early spring.
Habitat: Arctic tundra, moist alpine-subalpine slopes, streams, marshes, edges of moist forests, gravelly or sandy roadsides
Elevation: 10–2300 m

Distribution

V20-1436-distribution-map.gif

Alta., B.C., N.W.T., Nunavut, Sask., Yukon, Alaska, Oreg., Wash., n Eurasia

Discussion

Selected References

None.

Lower Taxa

None.

floccose +  and woolly +
tomentulose +  and glabrous +
glabrous +, glabrescent +  and tomentulose +
not tailed +, rounded +  and obtuse +
papillate +
scarious +
usually ovate +  and lance-linear +
racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Randall J. Bayer +, A. Linn Bogle +  and Donna M. Cherniawsky +
(Linnaeus) Fries +
decurrent +
Tussilago frigida +
2 cm20 mm <br />0.02 m <br /> (25 cm250 mm <br />0.25 m <br />) +
reniform;cordate +
2cm;27cm +
winged;nerved;ribbed +
barbellulate +  and smooth +
long-lived +
whitish +, pinkish +  and purplish +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.48 cm4.8 mm <br />0.0048 m <br />) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.44 cm4.4 mm <br />0.0044 m <br />) +
10-ribbed +  and 5-ribbed +
narrowly cylindric +  and weakly fusiform or more or less prismatic +
0.005 cm0.05 mm <br />5.0e-5 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
fertile +  and bisexual +
Alta. +, B.C. +, N.W.T. +, Nunavut +, Sask. +, Yukon +, Alaska +, Oreg. +, Wash. +  and n Eurasia +
10–2300 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Arctic tundra, moist alpine-subalpine slopes, streams, marshes, edges of moist forests, gravelly or sandy roadsides +
pistillate +  and staminate +
disciform +  and discoid +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
fertile +  and bisexual +
0.6 cm6 mm <br />0.006 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
obconic;turbinate +
sessile +  and petiolate +
cauline +  and basal +
toothed +, lobed +, obtuse +  and acute +
serrate +  and entire +
not lobed +  and lobed +
2-carpellate +
0 cm0 mm <br />0 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Flowering early spring. +
pistillate +  and staminate +
connate +  and distinct +
0.1 cm1 mm <br />0.001 m <br /> (0.95 cm9.5 mm <br />0.0095 m <br />) +
narrowly oblong +  and linear +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.33 cm3.3 mm <br />0.0033 m <br />) +
Summa Veg. Scand., +
neuter +  and styliferous +
sterile +  and fertile +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
exalbuminous +
Illustrated +
not branched +
appendaged +  and truncate +
papillate +
Petasites alaskanus +, Petasites corymbosus +, Petasites frigidus var. hyperboreoides +, Petasites frigidus var. nivalis +, Petasites gracilis +, Petasites hyperboreus +, Petasites nivalis +  and Petasites nivalis subsp. hyperboreus +
Petasites frigidus var. frigidus +
Petasites frigidus +
variety +
25 cm250 mm <br />0.25 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
10 cm100 mm <br />0.1 m <br /> (25 cm250 mm <br />0.25 m <br />) +