oyster plant

Names and Synonyms

Common Names

• Bear's Breech
• Bear's-Breech
• artist's acanthus
• bear's-breeches
• oak-leaf bear's-breeches
• sea-dock
• Bear's breeches
• Sea-Holly
• Bear´s breech

Scientific Names

Accepted name

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae within the phylum Streptophyta and the class Equisetopsida. It is further classified under the subclass Magnoliidae in the order Lamiales, falling into the family Acanthaceae. Finally, its taxonomic identity is defined by the genus Acanthus.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a diverse range of locations across several European regions. In Northern Europe, its presence can be found in both Great Britain and Ireland. Moving toward the center of the continent, it is also documented within Germany in Middle Europe. Its distribution extends to Southwestern Europe, where it inhabits the Baleares. Finally, the species is recorded in the island of Corse within the same southwestern territory.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Acanthus mollis is characterized by its ability to thrive across a broad altitudinal gradient, ranging from sea level (0 m AMSL) up to a maximum elevation of 2650 m AMSL. It primarily establishes itself within lowland habitats, where it can adapt to various environmental conditions typical of these lower elevations. This wide elevational range suggests a high degree of ecological plasticity, allowing the species to occupy diverse niches from coastal lowlands to much higher montane regions.

Elevational range max:

2650 m AMSL

Elevational range min:

0 m AMSL

Habitat :

Lowland

Life history

The life history of Acanthus mollis is characterized by its status as a perennial plant, allowing it to persist through multiple growing seasons. Functioning as a hemicryptophyte, its perennating buds are located at or just below the soil surface, which aids in its survival and establishment. The plant maintains an evergreen habit, retaining its foliage throughout the year, which contributes to its robust presence in its natural habitat.

Deciduousness :

evergreen

Life form :

hemicryptophyte

Lifecycle :

perennial

Morphology

The morphology of Acanthus mollis is characterized by its growth form as a non-woody herb, specifically classified as a forb. It functions as an independent organism, lacking any parasitic relationship, and thrives in terrestrial environments rather than as an aquatic, semiaquatic, or epiphytic plant. The plant exhibits a self-supporting growth habit, meaning it does not act as a climber, liana, or vine, and maintains an erect shoot orientation. In terms of stature, it typically reaches a plant height ranging from a minimum of 0.3 m to a maximum of 1.2 m.

Aquatic :

terrestrial

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

herb

Growth form :

forb

Parasite :

independent

Plant height max:

1.2 m

Plant height min:

0.3 m

Shoot orientation :

erect

Woodiness :

non-woody

Physiology

The physiological structure of Acanthus mollis is characterized by a robust vegetative framework, most notably defined by its large, lanceolate-shaped leaves. These leaves exhibit significant dimensional variability, with lengths ranging from a minimum of 20 cm up to a maximum of 100 cm, while the width fluctuates between 5 cm and 30 cm, maintaining a mean width of approximately 30 cm. The arrangement of the foliage follows an opposite phyllotaxy along the stem. From a nutritional standpoint, the plant does not function as a nitrogen fixer, relying instead on organic matter and soil nutrients for its metabolic requirements.

Leaf arrangement :

opposite

Leaf form :

lanceolate

Leaf length max:

100 cm

Leaf length min:

20 cm

Leaf width mean:

30 cm

Leaf width min:

5 cm

Nitrogen fixer :

no

Reproduction

The reproduction of Acanthus mollis involves both sexual and asexual mechanisms, with the sexual process facilitated by bisexual flowers. These violet-colored flowers are organized into inflorescences that typically range from a minimum of 0.1 m to a maximum of 0.6 m in length. The flowering season generally begins in April and concludes in July, though it can vary. Pollination is driven by biotic factors, specifically through an insect pollination syndrome, and the plant lacks the ability for self-fertilization. Once fertilized, the plant produces fruit in the form of a dehiscent capsule. These capsules vary in length, with a mean of 3.5 cm, though they can be as small as 0.2 cm or as large as 0.35 cm. Each fruit is highly productive, containing between 101 and 1000 seeds. The seeds themselves have a consistent mean width and minimum width of 11.5 mm, with a mean seed mass of 0.208 g (which also serves as the minimum and maximum recorded mass). Seed dispersal is achieved through both autochorous (self-dispersal) and anthropochorous (human-mediated) syndromes.

Dehiscence :

dehiscent

Dispersal syndrome :

autochorous

Dispersal syndrome :

anthropochorous

Flower colour :

violet

Flowering time :

Apr

Flowering time :

Jul

Fruit length max:

0.35 cm

Fruit length mean:

3.5 cm

Fruit length min:

0.2 cm

Fruit type :

capsule

Inflorescence length max:

0.6 m

Inflorescence length min:

0.1 m

Pollination syndrome :

insect

Pollination syndrome :

biotic

Reproduction asexual :

present

Reproduction sexual :

bisexual

Seed mass mean:

0.208 g

Seed width mean:

11.5 mm

Seeds_per_fruit :

101-1000

Self fertilization :

absent

Sources: Global Inventory of Floras and Traits (GIFT)

Plant Parts

Acanthus mollis has 2 reported plant parts identified across 3 scientific publications and several other databases that are studied for medicinal purposes. The most consistently reported plant part include leaf, flower.

Leaf

1. International journal of molecular sciences
2. Natural product research

Flower

1. Natural product research

Chemicals

Acanthus mollis has 8 reported phytochemicals identified across 3 scientific publications and several other databases. The most consistently reported chemicals include Anthraquinones, DIBOA, Flavonoids, Phenols, 15(S)-HETE.

Anthraquinones

1. Natural product research
2. Journal of ethnopharmacology

DIBOA

1. International journal of molecular sciences
2. Gels (Basel, Switzerland)

Flavonoids

1. Natural product research
2. Journal of ethnopharmacology

Phenols

1. Natural product research
2. Journal of ethnopharmacology

15(S)-HETE

1. Phytotherapy research : PTR

Hydrogen peroxide (H2O2)

1. International journal of molecular sciences

Phytosterols

1. Journal of ethnopharmacology

Verbascoside

1. International journal of molecular sciences

Activities

Acanthus mollis has 3 reported activities identified across 3 scientific publications and several other databases. The most consistently reported activities include Antioxidant, Antifungal, Neuroprotective.

Antioxidant

1. Natural product research
2. Journal of ethnopharmacology

Antifungal

1. Natural product research

Neuroprotective

1. Journal of ethnopharmacology

Medicinal Uses

Acanthus mollis has 8 reported medicinal uses identified across 3 scientific publications and several other databases. The most consistently reported uses include Candida, gastrointestinal diseases, inflammation, melanoma, melasma.

Most Reported Uses

Preparations