Petasites frigidus

(Linnaeus) Fries

Summa Veg. Scand., 182. 1845.

Common names: Arctic sweet coltsfoot Arctic butterbur
Illustrated
Basionyms: Tussilago frigida Linnaeus Sp. Pl. 2: 865. 1753
Synonyms: Nardosmia frigida (Linnaeus) Hooker
Treatment appears in FNA Volume 20. Treatment on page 637.

Plants 10–60 (–120) cm. Rhizomes much branched, creeping, often forming long-lived, spreading clones. Basal leaves: blades mostly reniform, orbiculate-cordate, cordate, ovate, triangular, or sagittate, margins subentire to coarsely dentate to wavy, or shallowly to deeply pinnipalmately or palmately lobed, lobes obtuse to acute, often again lobed or toothed, abaxial faces densely white-tomentose to lanate, adaxial faces densely lanate or floccose, glabrescent, or glabrous. Staminate heads 2–53 (ray-florets: 0 or 1–70, styliferous and sterile, corolla laminae 1.1–12 mm; disc-florets 11–78, functionally staminate; style-branches 0–2.3 mm, papillate or hairy). Pistillate heads 5–60 (ray-florets 30–139, pistillate and fertile, corolla laminae 0.6–6.3 mm; disc-florets 1–12, functionally staminate, style-branches 0–2.3 mm, papillate or hairy). Phyllaries: staminate 3.6–12.8 × 1–4.4 mm, pistillate 1–9.5 × 0.7–3.3 mm, margins entire or serrate. Cypselae 1.7–3.5 mm; pappi (longest, pistillate heads) 7–17.3 mm.

Distribution

V20-1435-distribution-map.gif

Alta., B.C., Man., N.B., N.S., N.W.T., Nfld. and Labr., Nunavut, Ont., P.E.I., Que., Sask., Yukon, Alaska, Calif., Colo., Conn., Idaho, Maine, Mass., Mich., Minn., Mont., N.Dak., N.H., N.Y., Oreg., R.I., S.Dak., Vt., Wash., Wis., Wyo., Eurasia

Discussion

Varieties 4 (4 in the flora).

Selected References

None.

Key

1 Basal leaves: blades sagittate or triangular to oblong (bases usually cordate, rarely hastate), margins not lobed, subentire or sinuate-dentate to callous-denticulate (teeth 11–45 per side), abaxial faces densely woolly to villous, adaxial faces tomentose and 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 hairy; pappi (pistillate) to 17.3 mm Petasites frigidus var. sagittatus
1 Basal leaves: blades sagittate, deltate, cordate, reniform, or orbiculate, margins lobed (and both faces glabrous or tomentulose to woolly) or dentate (teeth to 22 per side and abaxial faces floccose, adaxial faces mostly glabrous or sparsely tomentose); staminate heads 2–32, ray florets 1–70, corolla laminae 1.6–12 mm, disc floret style branches 0.01–2 mm, papillate or hairy; pistillate heads 5–42, ray (and/or pistillate) florets 30–125, corolla laminae 0 or 0.1–6.3 mm, disc florets: corolla lobes 0.4–4.4 mm, style branches papillate or hairy; pappi (pistillate) to 15 mm > 2
2 Basal leaves: blades orbiculate or cordate to reniform, margins lobed (primary lobes 5–11, sinuses sometimes almost to center, secondary lobes 0–13), margins entire or dentate (teeth to 52 per side); staminate heads 4–32, ray florets 5–70, corolla laminae 0.1–6.3 mm, disc floret style branches 0–1.7 mm; pistillate heads 8–42, ray florets 51–125, corolla laminae 0–6.3 mm, disc corolla lobes 0.5–2.9 mm; pappi (pistillate) to 11.8 mm Petasites frigidus var. palmatus
2 Basal leaves: blades sagittate, deltate, reniform, or cordate, margins lobed (primary lobes to 14, secondary lobes 0–25, and teeth to 44 per side) or dentate (teeth to 22 per side); staminate heads 2–32, ray florets 1–27, corolla laminae 1.6–12 mm, disc floret style branches 0.05–2 mm; pistillate heads 5–34, ray florets 30–109, corolla laminae 0.8–4.8 mm, disc corolla lobes 0.4–4.4 mm; pappi (pistillate) to 15 mm > 3
3 Basal leaves: blades deltate or cordate to reniform (bases usually convex-curved), margins lobed (primary lobes 4–14, triangular, secondary lobes 0–11, entire or dentate, teeth to 44); staminate heads 3–32, ray florets 2–27, corolla laminae 2.1–7.8 mm, disc floret style branches 0.4–1.4 mm; pistillate heads 9–34, ray florets 48–89, corolla laminae 0.8–2.5 mm, disc corolla lobes 0.8–2 mm Petasites frigidus var. ×vitifolius
3 Basal leaves: blades sagittate, deltate, or reniform to cordate, margins lobed (primary lobes to 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); staminate heads 2–20, ray florets 1–13, corolla laminae 1.6–12 mm, disc floret style branches 0.05–2 mm; pistillate heads 5–19, ray florets 30–109, corolla laminae 0.8–4.8 mm, disc corolla lobes 0.4–4.4 mm Petasites frigidus var. frigidus
... more about "Petasites frigidus"
densely white-tomentose +  and lanate +
glabrous +, glabrescent +, floccose +  and lanate +
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 +
compound +  and simple +
sagittate;triangular;sagittate;triangular;ovate;cordate;orbiculate-cordate;reniform +
winged;nerved;ribbed +
barbellulate +  and smooth +
long-lived +
Arctic sweet coltsfoot +  and Arctic butterbur +
whitish +, pinkish +  and purplish +
10-ribbed +  and 5-ribbed +
narrowly cylindric +  and weakly fusiform or more or less prismatic +
fertile +  and bisexual +
Alta. +, B.C. +, Man. +, N.B. +, N.S. +, N.W.T. +, Nfld. and Labr. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Alaska +, Calif. +, Colo. +, Conn. +, Idaho +, Maine +, Mass. +, Mich. +, Minn. +, Mont. +, N.Dak. +, N.H. +, N.Y. +, Oreg. +, R.I. +, S.Dak. +, Vt. +, Wash. +, Wis. +, Wyo. +  and Eurasia +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
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 +
subentire +  and coarsely dentate +
2-carpellate +
0.7 cm7 mm <br />0.007 m <br /> (1.73 cm17.3 mm <br />0.0173 m <br />) +
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 +
Nardosmia frigida +
Petasites frigidus +
Petasites +
species +
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 />) +