Bog Rosemary vs Clustered Stonewort

Andromeda polifolia compared with Tolypella glomerata

Key Differences

• Bog Rosemary is Endangered while Clustered Stonewort is Vulnerable.

Taxonomic Classification

Rank	Bog Rosemary	Clustered Stonewort
Kingdom same	Plantae (Plants)	Plantae (Plants)
Phylum	Magnoliophyta (Flowering Plants)	Charophyta (Charophyta)
Class	Magnoliopsida (Dicots)	Charophyceae (Charophyceae)
Order	Ericales (Ericales)	Charales (Charales)
Family	Ericaceae	Characeae
Genus	Andromeda	Tolypella
Species	Andromeda polifolia	Tolypella glomerata

Evolutionary Relationship

Bog Rosemary and Clustered Stonewort share a common ancestor at the Kingdom level: Plantae. (Plants)

Conservation Status

Bog Rosemary

EN — Endangered

Clustered Stonewort

VU — Vulnerable

Physical Characteristics

Attribute	Bog Rosemary	Clustered Stonewort
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Bog Rosemary

Habitat

Inhabits boreal forests and taiga within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Found across Europe (5 countries) and North America (United States). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Clustered Stonewort

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Bog Rosemary

The Bog Rosemary (Andromeda polifolia) is a species in the genus Andromeda. It is currently classified as Endangered on the IUCN Red List. Found across Europe (5 countries) and North America (United States).

Clustered Stonewort

Tolypella glomerata, the clustered stonewort, is a charophyte alga in the family Characeae, found in calcareous, nutrient-poor freshwater habitats including lakes, ponds, ditches, and slow-flowing water in northwestern and northern Europe. Charophytes are macroscopic green algae with a distinctive whorl-like arrangement of branches and a complex, plant-like structure that distinguishes them from other algae. T. glomerata is encrusted with calcium carbonate deposits (hence 'stonewort'), giving it a pale, grey-green appearance and rough texture. The species colonizes clear, low-nutrient water over fine sediment or gravel substrates where competition from vascular plants is reduced by nutrient limitation. It is listed as Vulnerable by the IUCN, reflecting significant declines driven by eutrophication (nutrient enrichment from agriculture and sewage), which promotes the growth of vascular plants and phytoplankton that shade out stoneworts. Drainage, water abstraction, and peat cutting also threaten its habitats. Charophyte diversity has declined substantially across lowland Europe and North America over the past century, with many species becoming locally extinct from sites they once colonized.

Shared Countries

Both species can be found in 3 countries:

🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden