Alcea is a genus of about 60 species of flowering plants in the mallow family Malvaceae, commonly known as the hollyhocks. They are native to Asia and Europe. The single species of hollyhock from the Americas, the streambank wild hollyhock, belongs to a different genus.
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.
- Alcea acaulis
- Alcea biennis (syn. A. pallida)
- Alcea calvertii
- Alcea ficifolia — Antwerp hollyhock
- Alcea flavovirens
- Alcea grossheimii — Grossheim's alcea
- Alcea heldreichii
- Alcea kurdica
- Alcea lavateriflora
- Alcea litwinowii
- Alcea longipedicellata
- Alcea nudiflora
- Alcea pallida
- Alcea rhyticarpa
- Alcea rosea — common hollyhock
- Alcea rugosa
- Alcea setosa — bristly hollyhock
- Alcea sosnovskyi
- Alcea striata
- Alcea sulphurea
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.
Pests and diseases
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. A number of weevils use A. rosea as their host plant, including Rhopalapion longirostre, Alocentron curvirostre, and Aspidapion validum.
A hollyhock flower known in Japan as aoi (葵), was incorporated into the official seal (mon) of the Tokugawa shogunate in Japan, and through this influence has maintained importance in modern Japanese culture. For example, it inspired the name and symbol of Mito HollyHock, a professional soccer club in a city formerly led by the Tokugawa family. The Aoi Matsuri (Hollyhock Festival) is one of the three main festivals of the city of Kyoto.
- Tang, Y.; et al. "Alcea". Flora of China. Missouri Botanical Garden, St. Louis, MO, and Harvard University Herbaria, Cambridge, Massachusetts. Retrieved 24 July 2012.
- GRIN Species Records of Alcea. Germplasm Resources Information Network (GRIN).
- Hollyhock: A. rosea. Better Homes and Gardens.
- 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.
- Brickell, C., Ed. The Royal Horticultural Society Encyclopedia of Garden Plants. Dorling Kindersly, London. 1996. pg. 93. ISBN 0-7513-0436-0
- 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.
- Hollyhock rust. Royal Horticultural Society.
- "Language of Flowers - Flower Meanings, Flower Sentiments". www.languageofflowers.com. Retrieved 2016-11-26.
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