Merriam’s Pocket Mouse vs Ray's Knotgrass

Perognathus merriami compared with Polygonum oxyspermum

Key Differences

• Merriam’s Pocket Mouse is Least Concern while Ray's Knotgrass is Endangered.

Taxonomic Classification

Rank	Merriam’s Pocket Mouse	Ray's Knotgrass
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Chordata (Chordates)	Magnoliophyta (Flowering Plants)
Class	Mammalia (Mammals)	Magnoliopsida (Dicots)
Order	Rodentia (Rodents)	Caryophyllales (Caryophyllales)
Family	Heteromyidae	Polygonaceae
Genus	Perognathus	Polygonum
Species	Perognathus merriami	Polygonum oxyspermum

Conservation Status

Merriam’s Pocket Mouse

LC — Least Concern

Ray's Knotgrass

EN — Endangered

Physical Characteristics

Attribute	Merriam’s Pocket Mouse	Ray's Knotgrass
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Merriam’s Pocket Mouse

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Ray's Knotgrass

Habitat

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

Range

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