Cayenne porterweed vs coast amaranth

Stachytarpheta cayennensis compared with Amaranthus pumilus

Key Differences

• Cayenne porterweed is Least Concern while coast amaranth is Extinct.

Taxonomic Classification

Rank	Cayenne porterweed	coast amaranth
Kingdom same	Plantae (Plants)	Plantae (Plants)
Phylum same	Magnoliophyta (Flowering Plants)	Magnoliophyta (Flowering Plants)
Class same	Magnoliopsida (Dicots)	Magnoliopsida (Dicots)
Order	Lamiales (Lamiales)	Caryophyllales (Caryophyllales)
Family	Verbenaceae	Amaranthaceae
Genus	Stachytarpheta	Amaranthus
Species	Stachytarpheta cayennensis	Amaranthus pumilus

Evolutionary Relationship

Cayenne porterweed and coast amaranth share a common ancestor at the Class level: Magnoliopsida. (Dicots)

Conservation Status

Cayenne porterweed

LC — Least Concern

coast amaranth

EX — Extinct

Physical Characteristics

Attribute	Cayenne porterweed	coast amaranth
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Cayenne porterweed

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and flooded grasslands and savannas, among 7 distinct biome types. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Africa (10 countries), Asia (5 countries), North America (4 countries), Oceania and the Pacific (12 countries), and South America (Brazil, Chile, Colombia).

coast amaranth

Habitat

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

Range

Found in Japan.

Cayenne porterweed

The Cayenne porterweed (Stachytarpheta cayennensis) is a species in the genus Stachytarpheta. It is currently classified as Least Concern on the IUCN Red List. Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and flooded grasslands and savannas, among 7 distinct biome types. Populations are also found in

coast amaranth

Coast amaranth (Amaranthus pumilus) is an annual herb in the family Amaranthaceae, native to the Atlantic and Gulf coasts of the eastern United States, where it once grew on coastal foredunes, beach strand, and shell-hash substrates above the high tide line from New York south to South Carolina. It is a low-growing, fleshy plant with small, rounded leaves and inconspicuous green flowers typical of the genus. Coast amaranth is assessed as Extinct in the Wild by the IUCN, as it has not been reliably documented from wild populations since the mid-20th century; the last confirmed collections date to the 1960s. The species' decline and likely extinction resulted from intense human pressure on Atlantic coastal habitats through shoreline development, beach stabilisation, vehicular traffic on beaches, and increased storm frequency disrupting pioneer dune vegetation. It is federally listed as Threatened in the United States, though this listing predates confirmed extinction in the wild. A small number of ex-situ accessions may exist in botanical garden collections. Genetic material and seed banking efforts represent the only remaining conservation options for this critically reduced species.

Shared Countries

Both species can be found in 1 countries:

🇯🇵 Japan