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.
Randall J. Bayer +, A. Linn Bogle +  and Donna M. Cherniawsky +
(Linnaeus) Fries +
Tussilago frigida +
Alta. +, B.C. +, N.W.T. +, Nunavut +, Sask. +, Yukon +, Alaska +, Oreg. +, Wash. +  and n Eurasia. +
10–2300 m +
Arctic tundra, moist alpine-subalpine slopes, streams, marshes, edges of moist forests, gravelly or sandy roadsides +
Flowering early spring. +
Summa Veg. Scand., +
Illustrated +
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 +