Buttonweed vs Coastal Ragweed

Malva neglecta compared with Ambrosia hispida

Taxonomic Classification

Rank	Buttonweed	Coastal Ragweed
Kingdom same	Plantae (Plants)	Plantae (Plants)
Phylum same	Magnoliophyta (Flowering Plants)	Magnoliophyta (Flowering Plants)
Class same	Magnoliopsida (Dicots)	Magnoliopsida (Dicots)
Order	Malvales (Malvales)	Asterales (Daisies & Sunflowers)
Family	Malvaceae	Asteraceae (Daisy Family)
Genus	Malva	Ambrosia
Species	Malva neglecta	Ambrosia hispida

Evolutionary Relationship

Buttonweed and Coastal Ragweed share a common ancestor at the Class level: Magnoliopsida. (Dicots)

Conservation Status

Buttonweed

LC — Least Concern

Coastal Ragweed

LC — Least Concern

Physical Characteristics

Attribute	Buttonweed	Coastal Ragweed
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Buttonweed

Habitat

Inhabits temperate broadleaf and mixed forests and deserts and xeric shrublands within the Palearctic biogeographic realm.

Range

Widely distributed across Africa (South Africa, Zimbabwe), Asia (6 countries), Europe (19 countries), North America (Canada, United States), Oceania and the Pacific (Australia), and South America (Argentina, Brazil, Chile).

Coastal Ragweed

Habitat

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

Range

Found in Cuba.

Buttonweed

The Buttonweed (Malva neglecta) is a species in the genus Malva. It is currently classified as Least Concern on the IUCN Red List. Inhabits temperate broadleaf and mixed forests and deserts and xeric shrublands within the Palearctic biogeographic realm.

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.