Coastal Ragweed vs small tortoiseshell

Ambrosia hispida compared with Aglais urticae

Key Differences

Coastal Ragweed is Least Concern while small tortoiseshell is Near Threatened.

Taxonomic Classification

Rank	Coastal Ragweed	small tortoiseshell
Kingdom	Plantae (植物)	Animalia (動物)
Phylum	Magnoliophyta (被子植物門)	Arthropoda (節足動物)
Class	Magnoliopsida (モクレン綱)	Insecta (昆虫)
Order	Asterales (キク目)	Lepidoptera (チョウ目)
Family	Asteraceae (Daisy Family)	Nymphalidae (Brush-footed Butterflies)
Genus	Ambrosia	Aglais
Species	Ambrosia hispida	Aglais urticae

Conservation Status

Coastal Ragweed

LC — Least Concern

small tortoiseshell

NT — Near Threatened

Physical Characteristics

Attribute	Coastal Ragweed	small tortoiseshell
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Coastal Ragweed

Habitat

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

Range

Found in Cuba.

small tortoiseshell

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Found across Europe (41 countries). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

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.