Common Silver Hairgrass vs Scorched Rustwort

Aira caryophyllea compared with Gymnomitrion adustum

Key Differences

• Common Silver Hairgrass is Endangered while Scorched Rustwort is Data Deficient.

Taxonomic Classification

Rank	Common Silver Hairgrass	Scorched Rustwort
Kingdom same	Plantae (Plants)	Plantae (Plants)
Phylum	Magnoliophyta (Flowering Plants)	Marchantiophyta (liverwort)
Class	Liliopsida (Monocots)	Jungermanniopsida (Jungermanniopsida)
Order	Poales (Grasses)	Jungermanniales (Jungermanniales)
Family	Poaceae (Grass Family)	Gymnomitriaceae
Genus	Aira	Gymnomitrion
Species	Aira caryophyllea	Gymnomitrion adustum

Evolutionary Relationship

Common Silver Hairgrass and Scorched Rustwort share a common ancestor at the Kingdom level: Plantae. (Plants)

Conservation Status

Common Silver Hairgrass

EN — Endangered

Scorched Rustwort

DD — Data Deficient

Physical Characteristics

Attribute	Common Silver Hairgrass	Scorched Rustwort
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

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.

Scorched Rustwort

Habitat

Native to Europe and North America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Norway, Sweden, and United States.

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 3 countries:

🇳🇴 Norway 🇸🇪 Sweden 🇺🇸 United States