Jacobaea maritima
Silver ragwort | |
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Mature plant at Għajn Tuffieħa, Malta | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Asterids |
Order: | Asterales |
Family: | Asteraceae |
Genus: | Jacobaea |
Species: | J. maritima
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Binomial name | |
Jacobaea maritima | |
Synonyms[1][2][3] | |
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Jacobaea maritima, commonly known as silver ragwort, is a
It is widely cultivated as an
Description
Silver Ragwort is a very
The tomentum is thickest on the underside of the leaves, and can become worn off on the upper side, leaving the top surface
Distribution
Jacobaea maritima is
It is also naturalised further north in Europe (north to Great Britain and Ireland, where occurring mainly in mild coastal areas[4][5]) and locally in North America.[7]
Ecology
As with many other densely tomentose plants, the tomentum, or hair-like pieces on the stems and leaves, is used by some species of bees (e.g. Anthidium manicatum and Anthidium oblongatum in Megachilidae) for nest-building.[8]
Hybrids are known with Jacobaea erucifolia and Jacobaea vulgaris. The J. vulgaris variant is fertile producing a wide range of intermediate progeny.[4][5]
Cultivation and uses
Jacobaea maritima is widely used in horticulture for its silvery foliage. It is winter-hardy in USDA Zones 8-10, tolerating winter temperatures down to -12° to -15 °C,[6][9] tolerant of light shade but preferring full sun.[6] In colder areas it is grown as an annual plant. Many cultivars have been selected for particularly dense silvery tomentum, such as 'Cirrus', 'New Look', 'Ramparts', 'Silverdust', 'Silver Filigree', and 'White Diamond'.[6] It has been recommended in North America for its fire resistance[10] resistance to browsing by deer,[11][12] and its salt tolerance.[13]
The cultivar 'Silver Dust' has gained the Royal Horticultural Society's Award of Garden Merit.[14]
Confusion in the horticultural trade exists between J. maritima and Centaurea cineraria, which has resulted in confusion regarding which cultivars pertain to either species, which has also resulted in much confusion in photographs of these species on the internet.[15]
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Foliage and buds, Corsica, France.
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J. maritima 'Silverdust', a cultivar selected for its dense silvery tomentum.
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Jacobaea maritima leaves in Athens, Greece
References
- PMID 21665692.
- ^ Botanic Garden; Botanical Museum Berlin-Dahlem. "Details for: Jacobaea maritima". Euro+Med PlantBase. Freie Universität Berlin. Retrieved 2008-02-19.
- ^ a b "Jacobaea maritima". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture. Retrieved 2008-02-27.
- ^ a b c Interactive Flora of NW Europe: Senecio cineraria Archived 2012-04-02 at the Wayback Machine
- ^ ISBN 0-340-40170-2
- ^ ISBN 0-333-47494-5.
- ^ Natural Resources Conservation Service (NRCS). "PLANTS Profile, Senecio cineraria DC". The PLANTS Database. United States Department of Agriculture. Retrieved 2008-02-27.
- ^ Shane R. Miller, Robert Gaebel, Randall J. Mitchell, and Mike Arduser; University of Akron. "Occurrence of two species of Old World bees, Anthidium manicatum and A. oblongatum (Apoidea: Megachilidae), in northern Ohio and southern Michigan" (PDF). The Great Lakes Entomologist. 35 (1): 65–69. Archived from the original (PDF) on 2009-02-05. Retrieved 2008-03-03.
{{cite journal}}
: CS1 maint: multiple names: authors list (link) - ^ "Cinéraire maritime, Senecio cineraria, Séneçon cinéraire". nature.jardin.free.fr. Retrieved May 1, 2023.
- ^ J. Knutson-Pedersen (July 2005). "Tree Notes" (PDF). Fire Safe Landscaping. Plumas Fire Safe Council. Archived from the original (PDF) on 2008-05-10. Retrieved 2008-03-02.
- F. W. Appleton (2003-09-29). "Coping with the deer by the use of deer resistant plants". Texas A&M University. Retrieved 2008-02-29.
- ^ "PLANTanswers". aggie-hort.tamu.edu. Retrieved May 1, 2023.
- ^ York County Office. "Salt Tolerant Plants for Water-front Applications" (PDF). Archived from the original (PDF) on 2007-10-24. Retrieved 2008-03-03.
- ^ "RHS Plant Selector - Senecio cineraria 'Silver Dust'". Retrieved 7 September 2020.
- ISSN 1355-4905.
External links
Media related to Jacobaea maritima at Wikimedia Commons