Button Sedge vs Common Silver Hairgrass

Carex bullata compared with Aira caryophyllea

Key Differences

• Button Sedge is Data Deficient while Common Silver Hairgrass is Endangered.

Taxonomic Classification

Rank	Button Sedge	Common Silver Hairgrass
Kingdom same	Plantae (Plants)	Plantae (Plants)
Phylum same	Magnoliophyta (Flowering Plants)	Magnoliophyta (Flowering Plants)
Class same	Liliopsida (Monocots)	Liliopsida (Monocots)
Order same	Poales (Grasses)	Poales (Grasses)
Family	Cyperaceae	Poaceae (Grass Family)
Genus	Carex	Aira
Species	Carex bullata	Aira caryophyllea

Evolutionary Relationship

Button Sedge and Common Silver Hairgrass share a common ancestor at the Order level: Poales. (Grasses)

Conservation Status

Button Sedge

DD — Data Deficient

Common Silver Hairgrass

EN — Endangered

Physical Characteristics

Attribute	Button Sedge	Common Silver Hairgrass
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Button Sedge

Habitat

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

Range

Distributed across Canada and United States.

Common Silver Hairgrass

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical grasslands and savannas, and flooded grasslands and savannas, among 11 distinct biome types. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Africa (Cameroon), Asia (Japan, South Korea), Europe (6 countries), North America (4 countries), Oceania and the Pacific (Australia), and South America (4 countries). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Button Sedge

The Button Sedge (Carex bullata) is a species in the genus Carex. It is currently classified as Data Deficient on the IUCN Red List. Typically found in grasslands, wetlands, forests, and cultivated landscapes.

Common Silver Hairgrass

<em>Aira caryophyllea</em>, commonly known as Common Silver Hairgrass, is a slender annual grass belonging to the family Poaceae within the order Poales. This delicate grass is currently classified as Endangered on the IUCN Red List, reflecting significant conservation concern despite its historically broad distribution. It is typically found across a remarkable diversity of biome types, including tropical and subtropical moist broadleaf forests, grasslands, savannas, and flooded habitats, demonstrating notable ecological versatility. Its geographic range spans multiple continents, with documented populations in Africa (Cameroon), Asia (Japan, South Korea), Europe, North America, Australia, and South America. As an annual grass, it completes its life cycle within a single growing season, reproducing via wind-dispersed seeds. The inflorescence typically bears silvery, shimmering spikelets that give the species its common name. Biological traits such as average lifespan, body dimensions, and dietary specifics follow typical patterns for annual grasses — drawing nutrients from soil through root absorption rather than consuming other organisms. The endangered status suggests populations may be declining due to habitat loss, land-use change, or invasive species pressure across parts of its range.

Shared Countries

Both species can be found in 2 countries:

🇨🇦 Canada 🇺🇸 United States