Alcea

"Hollyhock" redirects here. For the streambank wild hollyhock, a related species in western North America, see Iliamna rivularis. For other uses, see Hollyhock (disambiguation).

Alcea
Alcea setosa
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malvales
Family: Malvaceae
Subfamily: Malvoideae
Tribe: Malveae
Genus: Alcea
L.
Species

See text

Alcea is a genus of over 80 species of flowering plants in the mallow family Malvaceae, commonly known as the hollyhocks.[1] They are native to Asia and Europe.[1] The single species of hollyhock from the Americas, the streambank wild hollyhock, belongs to a different genus.

Description

Hollyhocks are annual, biennial, or perennial plants usually taking an erect, unbranched form. The herbage usually has a coating of star-shaped hairs. The leaf blades are often lobed or toothed, and are borne on long petioles. The flowers may be solitary or arranged in fascicles or racemes. The notched petals are usually over three centimeters wide and may be pink, white, purple, or yellow. The fruit is a schizocarp, a dry disc divided into over 15 sections that contain seeds.[1]

Species

The following species are accepted:[2]

Uses

Hollyhocks are popular garden ornamental plants. They are easily grown from seed. Breeds with red flowers attract hummingbirds and butterflies. Cultivars have been bred, especially from A. rosea. They include the double-flowered 'Chater's Double', the raspberry-colored 'Creme de Cassis', and 'The Watchman', which has dark, nearly black, maroon flowers.[3]

The stems of hollyhocks can be used as firewood, and the roots have been used medicinally.[1][4]

Pests and diseases

Rhopalapion longirostre
Hollyhock weevil (Rhopalapion longirostre)

Alcea species are used as food plants by the larvae of some Lepidoptera species including Bucculatrix quadrigemina and Vanessa cardui, the painted lady.

The mallow flea beetle (Podagrica fuscicornis) is a pest that makes tiny holes in the leaves. Cutworms, aphids, and capsid bugs use the plant as a food source in hotter and drier conditions.[5] A number of weevils use A. rosea as their host plant, including Rhopalapion longirostre, Alocentron curvirostre, and Aspidapion validum.[6]

The plants are also susceptible to the pathogenic fungus Puccinia malvacearum, the hollyhock rust.[7]

Culture

The Aoi Matsuri (Hollyhock Festival) is one of the three main festivals of the city of Kyoto. During the Victorian era, the hollyhock symbolized both ambition and fecundity in the language of flowers.[8]

The UK National Collection of hollyhocks is held by Jonathan Sheppard in Lincolnshire.[9][10]

  • Man carrying a hollyhock float during the Aoi Matsuri procession
    Man carrying a hollyhock float during the Aoi Matsuri procession
  • Alcea sp.
    Alcea sp.
  • Alcea setosa
    Alcea setosa
  • Sepals
    Sepals
  • Alcea rosea 'Nigra'
    Alcea rosea 'Nigra'
  • Alcea sp.
    Alcea sp.
  • Alcea sp. Closer look at the flower
    Alcea sp. Closer look at the flower

References

  1. ^ a b c d Tang, Y.; et al. "Alcea". Flora of China. Missouri Botanical Garden, St. Louis, MO, and Harvard University Herbaria, Cambridge, Massachusetts. Retrieved 24 July 2012.
  2. ^ "Alcea L." Plants of the World Online. Board of Trustees of the Royal Botanic Gardens, Kew. Retrieved 21 August 2021.
  3. ^ Hollyhock: A. rosea. Better Homes and Gardens.
  4. ^ Aydin, S.; Öztürk, Y.; Başer, K. H. C.; Kirimer, N.; Kurtar-Öztürk, N. (1992). "Effects of Alcea pallida L. (A.) and Tilia argentea Desf. Ex DC infusions on swimming performance in mice". Phytotherapy Research. 6 (4): 219–220. doi:10.1002/ptr.2650060411.
  5. ^ Brickell, C., Ed. The Royal Horticultural Society Encyclopedia of Garden Plants. Dorling Kindersly, London. 1996. pg. 93. ISBN 0-7513-0436-0
  6. ^ Wilhelm, G., et al. (2011). Sexual dimorphism in head structures of the weevil Rhopalapion longirostre (Olivier 1807) (Coleoptera: Curculionoidea): a response to ecological demands of egg deposition. Biological Journal of the Linnean Society 104(3) 642-60.
  7. ^ Hollyhock rust. Royal Horticultural Society.
  8. ^ "Language of Flowers - Flower Meanings, Flower Sentiments". www.languageofflowers.com. Retrieved 2016-11-26.
  9. ^ "Join Plant Heritage | Conserving the diversity of garden plants". www.plantheritage.org.uk.
  10. ^ "Cupcakes and fizz!". Lincolnshire Life.
  • Data related to Alcea at Wikispecies
  • Media related to Alcea at Wikimedia Commons

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