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''Centaurea cineraria'', the velvet centaurea, also known as dusty miller and silver dust (though these latter two names may also apply to '' Jacobaea maritima'' and '' Silene coronaria''), is a species of
flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (). The term angiosperm is derived from the Ancient Greek, Greek words (; 'container, vessel') and (; 'seed'), meaning that the seeds are enclosed with ...
in the family
Asteraceae Asteraceae () is a large family (biology), family of flowering plants that consists of over 32,000 known species in over 1,900 genera within the Order (biology), order Asterales. The number of species in Asteraceae is rivaled only by the Orchi ...
endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...
to southern
Italy Italy, officially the Italian Republic, is a country in Southern Europe, Southern and Western Europe, Western Europe. It consists of Italian Peninsula, a peninsula that extends into the Mediterranean Sea, with the Alps on its northern land b ...
. In natural settings, it grows on coastal cliffs, ranging from 0–350 m above sea level, hence the plant's Italian name, ''fiordaliso delle scogliere'' (lit. "cliff
cornflower ''Centaurea cyanus'', commonly known as cornflower or bachelor's button (among other names), is an annual flowering plant in the family Asteraceae native to Europe. In the past, it often grew as a weed in cornfields (in the broad sense of "co ...
"). Mature plants may reach in height. The species produces purple flowers. ''Centaurea cineraria'' is taxonomically complicated, with several described subspecies and significant geographic variation. Members of the ''C. cineraria'' group have variously been treated as full species, as subspecies, or simply as regional variations.


In Horticulture

''Centaurea cineraria'' is commonly cultivated for its foliage. Depending on climate, it can be grown as either an annual or as a perennial. In cultivation, this species prefers full sun and well-drained soil. ''Centaurea cineraria'' is sometimes referred to as '' Centaurea gymnocarpa'' within the horticultural trade, due to both taxonomic confusion and/or potential hybridization between ''C. cineraria'' and ''C. gymnocarpa'' in cultivation. However, cultivated material seems to mostly consist of ''C. cineraria'' in a narrower sense, with some possible introgression from other members of the ''C. cineraria'' group (including ''C. gymnocarpa''). True ''C. gymnocarpa'' is a rare plant in the wild and likely does not exist in cultivation outside of conservation settings. Despite past work that sometimes treated ''C. gymnocarpa'' as conspecific with ''C. cineraria'', current work supports both taxa at the species level. ''Centaurea cineraria'' occasionally escapes from cultivation, but, at least in North America, this has not resulted in established exotic populations. This species is, however, naturalized in
New Zealand New Zealand () is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and List of islands of New Zealand, over 600 smaller islands. It is the List of isla ...
. In the UK ''Centaurea cineraria'' subsp. ''cineraria'' has gained the
Royal Horticultural Society The Royal Horticultural Society (RHS), founded in 1804 as the Horticultural Society of London, is the UK's leading gardening charity. The RHS promotes horticulture through its five gardens at Wisley (Surrey), Hyde Hall (Essex), Harlow Carr ...
's
Award of Garden Merit The Award of Garden Merit (AGM) is a long-established award for plants by the British Royal Horticultural Society (RHS). It is based on assessment of the plants' performance under UK growing conditions. It includes the full range of cultivated p ...
. Because of similar leaf shape, leaf hairiness, and leaf color, there has been much confusion in the horticultural world between ''C. cineraria'' and the unrelated ''Jacobaea maritima'' (with ''Senecio cineraria'' being an old name for ''Jacobaea maritima''). ''Jacobaea maritima'' has similar foliage to ''C. cineraria'' ("cineraria" means "ash-gray colored"). Cultivars like 'Silver Dust', 'Silver Lace', and 'Cirrus' are sometimes mistakenly referred to as ''C. cineraria'' but these cultivars actually pertain to ''J. maritima''. The cultivar 'Colchester White' (named for the leaf color, not the flower color) does actually pertain to ''C. cineraria'' and is the most common cultivar of this species. This confusion has also resulted in many images on the internet being mistakenly identified, resulting in identification of cultivated material challenging, especially without reproductive parts.


References

* Cela Renzoni G, Viegi L. (1983). Centaurea cineraria s.l. (Asteraceae) in Italia: revisione citotassonomica. ''Atti della Società Toscana di Scienze Naturali''. Memorie serie B, 89: pp. 99–144. Società Toscana di Scienze Naturali, Pisa. * Ellis, Barbara W. (1999). ''Taylor's Guide to Annuals, How to Select and Grow More Than 400 Annuals, Biennials, and Tender Perennials''. Houghton Mifflin Company, New York, NY. * Armitage, Allan M. (2001). ''Armitage's Manual of Annuals, Biennials, and Half-Hardy Perennials''. Illustrated Asha Kays and Chris Johnson. Timber Press Inc., Singapore. {{Taxonbar, from=Q4117857
cineraria ''Cineraria'' is a genus of flowering plants in the sunflower family, native primarily to southern Africa with a few species further north. The genus includes herbaceous plants and small subshrubs. In the past, the genus was commonly viewed in ...
Plants described in 1753 Taxa named by Carl Linnaeus