Silver Ragwort, also known as Dusty Miller (Jacobaea maritima, formerly Senecio cineraria)
Kingdom: Plantae, Division: Tracheophyta, Class: Magnoliopsida, Order: Asterales, Family: Asteraceae, Genus: Jacobaea, Species: J. maritima · Asteraceae (Aster, Daisy, or Sunflower family) · Simple, deeply lobed or pinnatifid leaf, evergreen perennial
Species
Jacobaea maritima
Leaf Type
Simple, deeply lobed or pinnatifid leaf, evergreen perennial
Family
Asteraceae (Aster, Daisy, or Sunflower family)
Shape
Oblanceolate to oblong in outline, deeply pinnately lobed with rounded or obtuse lobes
Size
Approximately 1 to 2 inches long as shown in this pressed specimen; typical mature species leaves range from 2 to 5 inches in length
Margin
Deeply lobed and sinuate, with entire or slightly wavy margins on the individual lobes
Arrangement
Alternate leaf arrangement along the stem, forming a basal rosette in younger or non-flowering stages
Rarity
Very Common in cultivation and gardens, though locally restricted to coastal cliffs in its native Mediterranean wild habitat
Color & Pattern
Distinctive silvery-gray to white coloration due to a dense covering of fine, matted, woolly hairs (tomentum) on both upper and lower surfaces
Venation Pattern
Pinnate venation, though largely obscured by the dense, woolly indumentum characteristic of the species
Texture & Surface
Leathery to papery (when pressed), heavily covered with dense, white, felt-like or woolly pubescence on both surfaces
Description
Jacobaea maritima is a perennial subshrub celebrated for its striking, felted, silvery-white foliage. It forms a rounded, branching mound with deeply divided, woolly leaves and produces small, button-like clusters of bright yellow, daisy-like flower heads in summer. The entire plant is wrapped in a protective layer of white hairs that help reduce moisture loss and reflect intense sunlight in its native coastal habitats.
Key Features
Intensely silvery-white, felted-woolly foliage; deeply pinnately lobed leaves; woody base becoming shrubby over time; bright yellow composite flowers
Habitat
Thrives in coastal cliffs, rocky maritime environments, and well-drained poor soils under full sun exposure; highly tolerant of salt spray and drought
Geographic Range
Native to the Mediterranean region, but widely cultivated and naturalized as an ornamental plant in temperate zones worldwide
Condition Notes
This is a carefully preserved, dried herbarium specimen showing the characteristic foliage, stem, and root system intact. The leaf tissue is well-preserved with typical color retention of the dried tomentum and minor natural aging.
Interesting Facts
The dense white hairs act like a natural sunscreen and evaporation barrier, protecting the plant from scorching sun and salty maritime winds. It was formerly classified under the massive genus Senecio before being moved to Jacobaea.
Medicinal & Uses
Primarily grown as an ornamental bedding plant and landscape accent for its contrasting silver foliage. Historically, related species had minor herbal uses, but Dusty Miller is not commonly used medicinally today due to potential toxicity.
Ecological Role
Provides striking textural contrast in gardens and supports generalist pollinators when in bloom. Its tough, salt-tolerant nature makes it an important stabiliser in coastal environments.
Similar Species
Centaurea cineraria (Perennial Cornflower), which also goes by the common name Dusty Miller and shares a very similar silver-leaf appearance. Distinguished primarily by subtle differences in floral structure and leaf dissection.
Foraging Tips
Easily identified in gardens and landscaping by its unmistakable bright silver, velvet-textured foliage. In the wild, look for it clinging to sunny, rocky coastal bluffs in Mediterranean climates.
Toxicity Warning
Mildly Toxic. Contains pyrrolizidine alkaloids. Ingestion of plant parts can cause liver damage or gastrointestinal distress in humans and pets, especially livestock.