Coastal Ragweed vs Layered Cup

Ambrosia hispida compared with Peziza varia

Key Differences

Coastal Ragweed is Least Concern while Layered Cup is Not Evaluated.

Taxonomic Classification

Rank	Coastal Ragweed	Layered Cup
Kingdom	Plantae (植物)	Fungi (菌界)
Phylum	Magnoliophyta (被子植物門)	Ascomycota (子嚢菌門)
Class	Magnoliopsida (モクレン綱)	Pezizomycetes (チャワンタケ綱)
Order	Asterales (キク目)	Pezizales (チャワンタケ目)
Family	Asteraceae (Daisy Family)	Pezizaceae
Genus	Ambrosia	Peziza
Species	Ambrosia hispida	Peziza varia

Conservation Status

Coastal Ragweed

LC — Least Concern

Layered Cup

NE — Not Evaluated

Physical Characteristics

Attribute	Coastal Ragweed	Layered Cup
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.

Layered Cup

Habitat

Native to Europe and North America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Norway and United States.

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.