Clasped Pondweed vs Closed-Leaved Pondweed

Potamogeton perfoliatus compared with Potamogeton foliosus

Key Differences

• Clasped Pondweed is Endangered while Closed-Leaved Pondweed is Least Concern.

Taxonomic Classification

Rank	Clasped Pondweed	Closed-Leaved Pondweed
Kingdom same	Plantae (พืช)	Plantae (พืช)
Phylum same	Magnoliophyta (Flowering Plants)	Magnoliophyta (Flowering Plants)
Class same	Liliopsida (Monocots)	Liliopsida (Monocots)
Order same	Alismatales (อันดับขาเขียด)	Alismatales (อันดับขาเขียด)
Family same	Potamogetonaceae	Potamogetonaceae
Genus same	Potamogeton	Potamogeton
Species	Potamogeton perfoliatus	Potamogeton foliosus

Evolutionary Relationship

Clasped Pondweed and Closed-Leaved Pondweed share a common ancestor at the Genus level: Potamogeton.

Conservation Status

Clasped Pondweed

EN — Endangered

Closed-Leaved Pondweed

LC — Least Concern

Physical Characteristics

Attribute	Clasped Pondweed	Closed-Leaved Pondweed
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Clasped Pondweed

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, tundra, and tropical and subtropical moist broadleaf forests, among 8 distinct biome types. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Asia (Saudi Arabia), Europe (8 countries), North America (Canada, Cuba, United States), and Oceania and the Pacific (New Zealand). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Closed-Leaved Pondweed

Habitat

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

Range

Distributed across Cuba, Norway, and United States.

Clasped Pondweed

The Clasped Pondweed (Potamogeton perfoliatus) is a species in the genus Potamogeton. It is currently classified as Endangered on the IUCN Red List. Found across multiple habitat types including temperate broadleaf and mixed forests, tundra, and tropical and subtropical moist broadleaf forests, among 8 distinct biome types. Populations are also found in montane and highland environments

Closed-Leaved Pondweed

Closed-leaved pondweed refers to aquatic plants in the genus Potamogeton (family Potamogetonaceae) characterized by leaves in which the sheath margins are fused to form a closed tube around the stem, rather than remaining open as in many related species. These submerged or floating-leaved aquatics grow in ponds, lakes, slow-moving rivers, and ditches across temperate regions of Europe, Asia, and North America. The distinctive closed leaf sheath is a key taxonomic character distinguishing certain Potamogeton species and provides structural support to stems in flowing water. Pondweeds are ecologically vital components of freshwater ecosystems, providing oxygen through photosynthesis, stabilizing sediments with their root systems, offering refuge for invertebrates and small fish among submerged stems, and forming important foraging habitat for migratory waterfowl that consume the starchy tubers and seeds. Many pondweed species have declined due to water quality deterioration from nutrient enrichment, increased turbidity, mechanical disturbance from boat traffic, and invasive aquatic plant competition in freshwater habitats across Europe and North America.

Shared Countries

Both species can be found in 3 countries:

🇨🇺 Cuba 🇳🇴 Norway 🇺🇸 United States