Petasites frigidus var. sagittatus

(Pursh) Cherniawsky

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

Common names: Arrowleaf or arrowhead sweet coltsfoot pétasite sagitté
IllustratedEndemic
Basionyms: 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.

60 +, 59 +  and 58 +
densely woolly +  and villous +
glabrous +, glabrescent +  and tomentose +
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 +
(Pursh) Cherniawsky +
decurrent +
Tussilago sagittata +
2 cm20 mm <br />0.02 m <br /> (34 cm340 mm <br />0.34 m <br />) +
triangular;oblong +
2cm;30cm +
winged;nerved;ribbed +
barbellulate +  and smooth +
long-lived +
Arrowleaf or arrowhead sweet coltsfoot +  and pétasite sagitté +
whitish +, pinkish +  and purplish +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.54 cm5.4 mm <br />0.0054 m <br />) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
10-ribbed +  and 5-ribbed +
narrowly cylindric +  and weakly fusiform or more or less prismatic +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
fertile +  and bisexual +
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 +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Wet places, shallow standing water or marshy areas, bogs, fens, moist disturbed areas, roadsides, alluvial flats, recent clearcuts, moist woods and forest edges +
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 +
2-carpellate +
0 cm0 mm <br />0 m <br /> (1.73 cm17.3 mm <br />0.0173 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 +
exalbuminous +
Illustrated +  and Endemic +
not branched +
appendaged +  and truncate +
papillate +
Nardosmia sagittata +, Petasites dentatus +  and Petasites sagittatus +
Petasites frigidus var. sagittatus +
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 />) +