coast amaranth vs plicate sweet-grass

Amaranthus pumilus compared with Glyceria notata

Key Differences

• coast amaranth is Extinct while plicate sweet-grass is Critically Endangered.

Taxonomic Classification

Rank	coast amaranth	plicate sweet-grass
Kingdom same	Plantae (植物)	Plantae (植物)
Phylum same	Magnoliophyta (木兰植物门)	Magnoliophyta (木兰植物门)
Class	Magnoliopsida (木兰纲)	Liliopsida (百合纲)
Order	Caryophyllales (石竹目)	Poales (禾本目)
Family	Amaranthaceae	Poaceae (Grass Family)
Genus	Amaranthus	Glyceria
Species	Amaranthus pumilus	Glyceria notata

Evolutionary Relationship

coast amaranth and plicate sweet-grass share a common ancestor at the Phylum level: Magnoliophyta. (木兰植物门)

Conservation Status

coast amaranth

EX — Extinct

plicate sweet-grass

CR — Critically Endangered

Physical Characteristics

Attribute	coast amaranth	plicate sweet-grass
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

coast amaranth

Habitat

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

Range

Found in Japan.

plicate sweet-grass

Habitat

Typically found in grasslands, wetlands, forests, and cultivated landscapes.

Range

Widely distributed across Europe (4 countries), North America (Canada), Oceania and the Pacific (Australia), and South America (Colombia). Currently classified as Critically Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

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.