Closed Gentian vs Willow Gentian

Gentiana rubricaulis compared with Gentiana asclepiadea

Key Differences

• Closed Gentian is Least Concern while Willow Gentian is Not Evaluated.

Taxonomic Classification

Rank	Closed Gentian	Willow Gentian
Kingdom same	Plantae (พืช)	Plantae (พืช)
Phylum same	Magnoliophyta (Flowering Plants)	Magnoliophyta (Flowering Plants)
Class same	Magnoliopsida (พืชใบเลี้ยงคู่)	Magnoliopsida (พืชใบเลี้ยงคู่)
Order same	Gentianales (อันดับดอกหรีดเขา)	Gentianales (อันดับดอกหรีดเขา)
Family same	Gentianaceae	Gentianaceae
Genus same	Gentiana	Gentiana
Species	Gentiana rubricaulis	Gentiana asclepiadea

Evolutionary Relationship

Closed Gentian and Willow Gentian share a common ancestor at the Genus level: Gentiana.

Conservation Status

Closed Gentian

LC — Least Concern

Willow Gentian

NE — Not Evaluated

Physical Characteristics

Attribute	Closed Gentian	Willow Gentian
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Closed Gentian

Habitat

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

Range

Distributed across Canada and United States.

Willow Gentian

Habitat

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

Range

Found across Europe (6 countries).

Closed Gentian

The closed gentian or bottle gentian (Gentiana andrewsii) is a striking herbaceous perennial in the family Gentianaceae native to eastern and central North America, found from Quebec and New England west to Nebraska and south to Georgia. Unlike most gentians, the deep violet-blue flowers of this species remain permanently closed — the petals fused into a bottle-like shape through which only strong bumblebees, primarily Bombus species, can force entry to access nectar and pollen, making it a specialist of bumblebee pollination. Plants grow 30–60 cm tall in moist prairies, wet meadows, fens, stream banks, and open woodland edges, flowering in late summer and autumn when few other wildflowers are in bloom. The closed flower form prevents small insects from accessing floral rewards while selecting for robust, strong-flying pollinators capable of forcing the petals apart. Closed gentian is declining across its range due to loss of moist prairie and fen habitats, wetland drainage, invasive species competition, and the regional decline of specialist bumblebee pollinators, with which its reproductive success is closely linked.