Coastal Ragweed vs Katung Fa

Ambrosia hispida compared with Alstonia macrophylla

Taxonomic Classification

Rank	Coastal Ragweed	Katung Fa
Kingdom same	Plantae (พืช)	Plantae (พืช)
Phylum same	Magnoliophyta (Flowering Plants)	Magnoliophyta (Flowering Plants)
Class same	Magnoliopsida (พืชใบเลี้ยงคู่)	Magnoliopsida (พืชใบเลี้ยงคู่)
Order	Asterales (อันดับทานตะวัน)	Gentianales (อันดับดอกหรีดเขา)
Family	Asteraceae (Daisy Family)	Apocynaceae
Genus	Ambrosia	Alstonia
Species	Ambrosia hispida	Alstonia macrophylla

Evolutionary Relationship

Coastal Ragweed and Katung Fa share a common ancestor at the Class level: Magnoliopsida. (พืชใบเลี้ยงคู่)

Conservation Status

Coastal Ragweed

LC — Least Concern

Katung Fa

LC — Least Concern

Physical Characteristics

Attribute	Coastal Ragweed	Katung Fa
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.

Katung Fa

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and deserts and xeric shrublands within the Indomalayan biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Distributed across Congo (DRC), Seychelles, Sri Lanka, 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.