White Butterbur

Names and Synonyms

Common Names

• White Butterbur

Scientific Names

Accepted name

Synonyms

• Petasites albus var. ramosus
• Tussilago alba
• Tussilago alba var. hermaphrodita
• Petasites glabrescens
• Tussilago alba var. ramosa
• Petasites ramosus
• Petasites vulgaris subsp. albus
• Tussilago glabrescens
• Tussilago lutea
• Tussilago ramosa
• Petasites petasites

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae and the phylum Streptophyta within the class Equisetopsida. It is further classified under the subclass Magnoliidae and the order Asterales. Finally, it is a member of the family Asteraceae within the genus Petasites.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant is widely distributed across several regions within Northern Europe. Specifically, it can be found growing in the landscapes of Denmark and Norway. Its presence extends to the islands of the Faroe Islands, known locally as Føroyaar. Additionally, the species is established throughout Great Britain. Finally, its geographical range includes the lush terrain of Ireland.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Petasites albus is characterized by its preference for high-moisture environments situated within mountainous regions and along the banks of rivers. This species thrives in damp, shaded, or semi-shaded habitats where the soil remains consistently moist, often occupying riparian zones and alluvial meadows. By colonizing the margins of flowing water and the cool, humid microclimates of montane slopes, it leverages the nutrient-rich, silt-heavy soils typical of riverine ecosystems. Its presence is closely tied to these specific hydrological conditions, allowing it to form dense colonies in the transition zones between aquatic and terrestrial mountain landscapes.

Habitat :

mountains, rivers

Life history

The life history of Petasites albus is characterized by its existence as a perennial plant, ensuring its long-term survival within its habitat through multiple growing seasons. It functions as a geophyte, a life form where the plant survives unfavorable periods by storing energy in underground organs, while also being classified under the broader category of cryptophyte due to its specialized survival strategies. The plant exhibits a deciduous nature, shedding its foliage as it transitions through seasonal cycles, which allows it to endure dormant periods before emerging again in subsequent years.

Deciduousness :

deciduous

Life form :

geophyte

Life form :

cryptophyte

Lifecycle :

perennial

Morphology

The morphology of Petasites albus is characterized by its growth form as a non-woody herb, functioning as a self-supporting plant that does not require climbing structures. It is a terrestrial species that grows independently, lacking any parasitic or epiphytic behavior. In terms of stature, the plant exhibits a variable height, with individual specimens ranging from a minimum of 0.07 m to a maximum of 0.8 m, maintaining an average plant height of approximately 0.425 m.

Aquatic :

terrestrial

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

herb

Parasite :

independent

Plant height max:

0.8 m

Plant height mean:

0.425 m

Plant height min:

0.07 m

Woodiness :

non-woody

Physiology

The physiology of Petasites albus is characterized by a C3 photosynthetic pathway, a common metabolic strategy for temperate herbaceous species that relies on the direct fixation of atmospheric carbon dioxide via the enzyme Rubisco. This plant is non-carnivorous, obtaining its necessary nutrients through traditional soil-based uptake rather than through the capture and digestion of prey. Its morphological adaptations for light interception and resource management are reflected in its significant leaf size, which has a mean area of 233.22583 cm², and a mean Specific Leaf Area (SLA) of 268.87 cm²/g. This relatively high SLA suggests a leaf structure optimized for maximizing photosynthetic surface area per unit of biomass, facilitating efficient light capture in its typical growing environments.

Carnivory :

non-carnivorous

Leaf size mean:

233.22583 cm²

Photosynthetic pathway :

C3

Specific Leaf Area (SLA) mean:

268.87 cm²/g

Reproduction

The reproduction of Petasites albus is characterized by a sexual process, as asexual reproduction is absent. The flowering period typically commences in April and concludes in May. During the reproductive phase, the plant utilizes a biotic pollination syndrome, specifically relying on insect pollination to facilitate the transfer of pollen. The reproductive cycle involves self-fertilization, which is present within the species. Following successful fertilization, the plant produces fruit in the form of an achene. These fruits are indehiscent, meaning they do not open at maturity to release seeds. The resulting seeds are quite small, with a mean seed mass of approximately 0.000234 g. Once mature, the seeds are dispersed via an anemochorous syndrome, utilizing wind as the primary mechanism for movement and colonization.

Dehiscence :

indehiscent

Dispersal syndrome :

anemochorous

Flowering time :

Apr

Flowering time :

May

Fruit type :

achene

Pollination syndrome :

insect

Pollination syndrome :

biotic

Reproduction asexual :

absent

Seed mass mean:

0.000234 g

Self fertilization :

present

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

Petasites albus has 1 reported phytochemicals identified across 0 scientific publications and several other databases. The most consistently reported chemicals include Euparin.

Euparin

1. Natural product research

Preparations

Petasites albus has 2 reported preparations identified across 0 scientific publications and several other databases. The most consistently reported preparations include essential oil, essential oil of aerial parts.

Essential oil

1. Natural product research

Essential oil of aerial parts

1. Natural product research