Petasites frigidus var. sagittatus

(Pursh) Cherniawsky

Canad. J. Bot. 76: 2070. 1999.

Common names: Arrowleaf or arrowhead sweet coltsfoot pétasite sagitté
IllustratedEndemic
Basionym: Tussilago sagittata Banks ex Pursh Fl. Amer. Sept., 531. 1813
Synonyms: Nardosmia sagittata (Banks ex Pursh) Hooker Petasites dentatus Blankinship Petasites sagittatus (Banks ex Pursh) A. Gray
Treatment appears in FNA Volume 20. Treatment on page 638. Mentioned on page 637.

Basal leaves: blades palmately or palmati-pinnately nerved, sagittate or triangular to oblong, 2–34 × 2–30 cm (bases sagittate or cordate, sometimes hastate), margins not lobed (subentire, callous-denticulate, or sinuate-dentate, teeth 11–45 per side), abaxial faces densely woolly to villous, adaxial faces usually tomentose, sometimes glabrescent or glabrous. Staminate heads 8–35; ray florets 4–19, corolla laminae 1.1–7.7 mm; disc floret style branches 0.5–2.3 mm, hairy. Pistillate heads 6–34; ray florets 31–139, corolla laminae 0.6–5.4 mm; disc florets: corolla lobes 0.4–1.8 mm, style branches 0.3–1.3 mm, hairy. Pappi (pistillate) to 17.3 mm. 2n = 58, 59, 60.


Phenology: Flowering early spring.
Habitat: Wet places, shallow standing water or marshy areas, bogs, fens, moist disturbed areas, roadsides, alluvial flats, recent clearcuts, moist woods and forest edges
Elevation: 10–3000 m

Distribution

V20-1438-distribution-map.gif

Alta., B.C., Man., N.B., Nfld. and Labr. (Labr.), N.W.T., Nunavut, Ont., Que., Sask., Yukon, Alaska, Colo., Idaho, Mich., Minn., Mont., N.Dak., S.Dak., Wash., Wis., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.
Randall J. Bayer +, A. Linn Bogle +  and Donna M. Cherniawsky +
(Pursh) Cherniawsky +
Tussilago sagittata +
Arrowleaf or arrowhead sweet coltsfoot +  and pétasite sagitté +
Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. (Labr.) +, N.W.T. +, Nunavut +, Ont. +, Que. +, Sask. +, Yukon +, Alaska +, Colo. +, Idaho +, Mich. +, Minn. +, Mont. +, N.Dak. +, S.Dak. +, Wash. +, Wis. +  and Wyo. +
10–3000 m +
Wet places, shallow standing water or marshy areas, bogs, fens, moist disturbed areas, roadsides, alluvial flats, recent clearcuts, moist woods and forest edges +
Flowering early spring. +
Canad. J. Bot. +
Illustrated +  and Endemic +
Nardosmia sagittata +, Petasites dentatus +  and Petasites sagittatus +
Petasites frigidus var. sagittatus +
Petasites frigidus +
variety +