Petasites Miller (Q2921)

taxon name

Petasites

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taxon authority

Miller

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taxon rank

genus

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taxon status

accepted

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common name

sweet coltsfoot (English)

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Butterbur (English)

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coltsfoot (English)

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pétasite (English)

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VasCan taxon numeric id

1524

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parent taxon

Senecioneae

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taxon habit

herb

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GBIF taxon key

10717129

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Global Biodiversity Information Facility

IUCN Redlist Category

NE

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Global Biodiversity Information Facility

distribution

Boreal North America

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southward in w Cordillera

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Eurasia

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taxon description fragment

Stems erect, not branched (± scapiform; stems of “staminate” plants wither soon after flowering, stems of “pistillate” plants elongate after flowering).

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d0_s1

petiolate or sessile;

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d0_s4

basal (usually appearing after heads) palmately or palmati-pinnately nerved, mostly deltate to ovate or orbiculate, margins entire, denticulate, or toothed to lobed, abaxial faces ± tomentose, adaxial tomentulose and glabrescent or glabrous;

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d0_s5

cauline (sessile) bractlike (essentially expanded petioles, proximal sometimes bearing blades).

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d0_s6

Heads radiate, discoid, or disciform, usually in corymbiform, paniculiform, or racemiform arrays, rarely borne singly {“staminate” heads usually radiate, peripheral 1–20 (–70) florets styliferous and sterile or neuter, inner 11–78 florets usually functionally staminate, rarely bisexual and fertile; “pistillate” heads usually radiate, peripheral (1–) 30–130+ florets pistillate and fertile, inner 1–12 florets functionally staminate}.

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d0_s7

Calyculi 0 or of 1–5+ bractlets.

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d0_s8

(expanding in fruit).

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d0_s10

Phyllaries persistent, mostly 12–15 in (1–) 2 series (often purplish-tinged), erect, distinct or connate, narrowly oblong to linear (1–5-nerved), subequal, margins ± scarious (apices not black).

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d0_s11

Receptacles flat to convex, foveolate, epaleate.

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d0_s12

Ray-florets 0 or (1–) 30–130+, usually fertile (in pistillate heads), sometimes styliferous and sterile or neuter (in staminate heads);

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d0_s13

corollas whitish or pinkish to purplish [yellow] (tubes filiform, laminae linear to oblong; styles filiform to clavate, entire or shallowly 2-cleft, papillate).

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d0_s14

Peripheral (pistillate) florets usually 30–125 and fertile, sometimes 0;

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d0_s15

corollas whitish or pinkish to purplish [yellow] (filiform, usually 5-lobed, sometimes minutely bilabiate; styles filiform to clavate, entire or shallowly 2-cleft, papillate).

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d0_s16

Inner (functionally staminate or bisexual) florets 1–78, usually functionally staminate, rarely bisexual and fertile;

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d0_s17

corollas whitish [yellow] (tubes longer than ± campanulate throats, lobes 5, erect or recurved, lanceolate to linear; styles linear to clavate, branches usually 0 or short-conic and papillate, sometimes lanceolate to oblong and ± hispidulous).

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d0_s18

Cypselae narrowly cylindric to weakly fusiform or ± prismatic, 5-ribbed or 10-ribbed, faces glabrous [villous];

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