Petasites frigidus var. ×vitifolius

(Greene) Cherniawsky

Canad. J. Bot. 76: 2072. 1999.

Common names: Pétasite à feuilles de vigne
Basionyms: Petasites vitifolius Greene Leafl. Bot. Observ. Crit. 1: 180. 1906
Synonyms: Petasites nivalis subsp. vitifolius (Greene) J. Toman Petasites trigonophyllus Greene Petasites warrenii H. St. John
Treatment appears in FNA Volume 20. Treatment on page 639. Mentioned on page 638, 640.

Basal leaves: blades palmately to palmati-pinnately nerved, deltate or broadly cordate to reniform, 2–43 × 3.5–47 cm (bases sometimes convex-curved), irregularly palmately to palmati-pinnately lobed (primary lobes 4–14, triangular, sinuses usually less than halfway to bases, lobes subentire to sinuate-dentate, secondary lobes 0–11, entire or dentate, teeth to 44 per side), abaxial and adaxial faces glabrous or woolly to tomentose, sometimes glabrescent. Staminate heads 3–32; ray-florets 2–27, corolla laminae 2.1–7.8 mm; disc-floret style-branches 0.4–1.4 mm, papillate or hairy. Pistillate heads 9–34; ray-florets 48–89, corolla laminae 0.8–2.5 mm; disc-florets: corolla lobes 0.8–2 mm, style-branches 0.3–1.2 mm, papillate or hairy. Pappi (pistillate) to 15 mm. 2n = 60.


Phenology: Flowering early spring.
Habitat: Wet marshy sites, moist woodlands
Elevation: 100–1700 m

Distribution

V20-1439-distribution-map.gif

Alta., B.C., Man., Nfld. and Labr. (Labr.), N.W.T., Ont., Que., Sask., Yukon, Mich., Minn., Wash., Wis.

Discussion

Petasites frigidus var. ×vitifolius often grows in association with one or both putative parents (P. frigidus var. palmatus and P. frigidus var. sagittatus).

Lower Taxa

None.

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 +
(Greene) Cherniawsky +
decurrent +
Petasites vitifolius +
2 cm20 mm <br />0.02 m <br /> (43 cm430 mm <br />0.43 m <br />) +
glabrescent +
broadly cordate;reniform +
3.5cm;47cm +
winged;nerved;ribbed +
barbellulate +  and smooth +
long-lived +
Pétasite à feuilles de vigne +
whitish +, pinkish +  and purplish +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
10-ribbed +  and 5-ribbed +
narrowly cylindric +  and weakly fusiform or more or less prismatic +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
fertile +  and bisexual +
Alta. +, B.C. +, Man. +, Nfld. and Labr. (Labr.) +, N.W.T. +, Ont. +, Que. +, Sask. +, Yukon +, Mich. +, Minn. +, Wash. +  and Wis. +
100–1700 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Wet marshy sites, moist woodlands +
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 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 />) +
Canad. J. Bot. +
neuter +  and styliferous +
sterile +  and fertile +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
bogle1968a +
exalbuminous +
Illustrated +
not branched +
appendaged +  and truncate +
papillate +
Petasites nivalis subsp. vitifolius +, Petasites trigonophyllus +  and Petasites warrenii +
Petasites frigidus var. ×vitifolius +
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 />) +