bay barnacle vs Coastal Ragweed

Amphibalanus improvisus compared with Ambrosia hispida

Key Differences

bay barnacle is Not Evaluated while Coastal Ragweed is Least Concern.

Taxonomic Classification

Rank	bay barnacle	Coastal Ragweed
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Arthropoda (Arthropods)	Magnoliophyta (Flowering Plants)
Class	Maxillopoda (Maxillopoda)	Magnoliopsida (Dicots)
Order	Sessilia (Sessilia)	Asterales (Daisies & Sunflowers)
Family	Balanidae	Asteraceae (Daisy Family)
Genus	Amphibalanus	Ambrosia
Species	Amphibalanus improvisus	Ambrosia hispida

Conservation Status

bay barnacle

NE — Not Evaluated

Coastal Ragweed

LC — Least Concern

Physical Characteristics

Attribute	bay barnacle	Coastal Ragweed
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

bay barnacle

Habitat

Native to Africa and Asia and Europe, inhabiting ecosystems characteristic of the region.

Range

Widely distributed across Africa (Egypt), Asia (8 countries), Europe (15 countries), North America (4 countries), Oceania and the Pacific (Australia), and South America (Argentina, Brazil, Ecuador).

Coastal Ragweed

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Range

Found in Cuba.

bay barnacle

The Bay barnacle (Amphibalanus improvisus) is a species in the genus Amphibalanus. Native to Africa and Asia and Europe, inhabiting ecosystems characteristic of the region. Its range includes Argentina, Australia, Azerbaijan, Belgium, and Brazil.

Coastal Ragweed

Coastal ragweed (Ambrosia hispida) is a perennial herb in the family Asteraceae, native to the coastal dunes, sandy beaches, and cays of Cuba, the Bahamas, and the wider Caribbean region. It grows in pioneer beach and dune vegetation, often forming spreading colonies that help stabilise loose coastal sands. Like other members of the genus Ambrosia, it bears inconspicuous greenish-white flowers arranged in racemes; male flower heads produce wind-dispersed pollen that can trigger allergic rhinitis in sensitive individuals. The deeply lobed, hispid leaves are adapted to reflect intense solar radiation and tolerate salt spray. Coastal ragweed plays an ecological role in early dune succession, binding sand and enabling other plant species to establish. The genus is widespread globally, with several Ambrosia species considered noxious weeds in agricultural settings, though Ambrosia hispida is restricted to its native Caribbean coastal range. The IUCN assesses it as Least Concern, reflecting adequate population size across its Caribbean coastal distribution. Pressure from coastal development and tourism infrastructure poses a localised threat to dune communities it inhabits.