Acanthus mollis

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Acanthus mollis
Acanthaceae - Acanthus mollis (2).JPG
Inflorescence of Acanthus mollis
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Lamiales
Family: Acanthaceae
Genus: Acanthus
Species: A. mollis
Binomial name
Acanthus mollis
  • Acanthus hispanicus Loudon
  • Acanthus latifolius E.Goeze
  • Acanthus longifolius Poir.
  • Acanthus lusitanicus auct.
  • Acanthus niger Mill.
  • Acanthus platyphyllus Murb.
  • Acanthus spinosissimus Host nom. illeg.

Acanthus mollis, commonly known as bear's breeches,[2] sea dock,[2] bearsfoot[citation needed] or oyster plant,[citation needed] is a herbaceous perennial plant with an underground rhizome in the genus Acanthus. It is regarded as an invasive species in some jurisdictions.[3]


The name of the genus derives from the Greek term ἄκανθος, akanthos, the name of the plant in Greek; it was imitated in Corinthian capitals; the word is related to ἄκανθα, akantha meaning "thorn" referring to the thorn-bearing sepals, or any thorny or prickly plant in Greek, while the Latin name of the species, mollis meaning "soft", "smooth", refers to the texture of the leaves.[4]


Close-up on a flower of Acanthus mollis
Leaf of Acanthus mollis
Corinthian column capital in the Mosque of Uqba in Kairouan, Tunisia

Acanthus mollis reaches on average 30–80 centimetres (12–31 in) of height, with a maximum of 180 centimetres (71 in), inflorescence included. It has basal clusters of deeply lobed and cut, shiny dark green leaves, soft to the touch, up to 40 centimetres (16 in) long and 25 centimetres (9.8 in) broad, with a long petiole. The inflorescence is a cylindrical spike 30–40 centimetres (12–16 in) long and can produce up to 120 flowers. The flowers are tubular, whitish, and lilac or rose in colour. Each flower is up to 5 centimetres (2.0 in) long and it is surrounded by three green or purplish bracts. The central bract is spiny and larger than the other two. The calyx has two lips: the upper is purple on top, rather long and forms a kind of "helmet" on top of the corolla. The corolla is reduced to a white lower lip, trilobed, with purple-pink venation. The four stamens are fused to the corolla and look like tiny brushes. This species flowers in late spring or early summer, from May through August.


Acanthus mollis is entomophilous and it is pollinated only by bees or bumble bees large enough to force their way between the upper sepal and the lower, so that they can reach the nectar at the bottom of the tube. The fruit is an ovoid capsule containing two to four large black seeds. The dispersal of seeds is by the wind (anemochory).

These plants are usually propagated from tubers and tend to form large, localized clumps which can survive for several decades and look statuesque when well-grown, but its suitability as a garden plant is lessened on account of its invasive nature (new plants are produced readily both from seed and portions of root) and its susceptibility to powdery mildew and attacks from snails.


This plant is native to the Mediterranean region from Portugal and northwest Africa east to Croatia and it is one of the earliest cultivated species.


This garden plant is also quite common in the wild. It grows in dry areas, roadsides and wastelands, especially in rocky and bushy places. It is tolerant of drought and shade and generally does not exceed an altitude of 300 metres (980 ft) above sea level.


The leaves of this plant are generally considered by historians to have been the design inspiration for the Corinthian order capitals of Greco-Roman architecture.[5]



  1. "The Plant List: A Working List of All Plant Species". Retrieved 18 December 2014.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  2. 2.0 2.1 "USDA GRIN Taxonomy". Retrieved 18 December 2014.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. Weeds of Australia, Biosecurity Queensland edition: Bear's breeches, Acanthus mollis
  4. ἄκανθος, ἄκανθα. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project. "άκανθος".<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>, άκανθος (in Greek). Centre for the Greek Language. <templatestyles src="Module:Citation/CS1/styles.css"></templatestyles> Harper, Douglas. "acanthus". Online Etymology Dictionary.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles> mollis. Charlton T. Lewis and Charles Short. A Latin Dictionary on Perseus Project.
  5. Vitruvius. On Architecture. Book IV.
  • "Factsheet - Acanthus mollis". The University of Queensland. 2011. Retrieved 8 January 2016.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  • Pierre Delforge - Orchids of Europe, North Africa And the Middle East - 2006, Timber Press
  • Pignatti S. - Flora d'Italia (3 voll.) - Edagricole – 1982, Vol. III
  • Tutin, T.G. et al. - Flora Europaea, second edition - 1993

External links