Gentiana affinis
Gentiana affinis is a species of flowering plant in the family Gentianaceae. It is native to western and central North America, ranging from southwestern Canada to the western and central United States. It is commonly known as the prairie gentian or pleated gentian.
Description
Gentiana affinis is a perennial herb arising from a branched caudex. Stems are ascending to erect, typically 10–30 cm tall, and may be glabrous to slightly puberulent. Leaves are cauline, lanceolate to ovate, 1–4 cm long, with the lower leaves smaller. The inflorescence is a leafy-bracteate panicle. Flowers are five-merous and funnelform, with a calyx 5–17 mm long and unequal lobes. The corolla is deep blue, approximately 23–40 mm long, with distinctive fringed folds (plaits) between the lobes. Fruit is a capsule 2–4 cm long.
Distribution and habitat
The species is widely distributed across western and central North America.
Its native range includes:
- Canada: Alberta, British Columbia, Manitoba, Northwest Territories, Saskatchewan
- United States: Arizona, California, Colorado, Idaho, Minnesota, Montana, Nevada, New Mexico, North Dakota, Oregon, South Dakota, Texas, Utah, Washington, Wyoming
It typically occurs in moist, open habitats such as prairies, meadows, grasslands, and wetland margins, often in plains, valleys, and montane environments.
Ecology
Gentiana affinis is adapted to temperate climates and is often associated with seasonally moist or saline soils.
Pollination is primarily carried out by bumblebee species (genus Bombus), including Bombus appositus, B. fervidus, B. flavifrons, B. sylvicola, B. pensylvanicus, and B. kirbiellus.
Taxonomy
The species was first described by August Grisebach in 1837 in Flora Boreali-Americana.
Modern treatments, including the Flora of North America (2023), recognize two varieties:
- Gentiana affinis var. affinis
- Gentiana affinis var. ovata A.Gray
Previously described taxa such as G. affinis var. bigelovii and G. affinis var. parvidentata are now considered indistinct from the typical variety. The species has historically been placed in other genera, including Dasystephana and Pneumonanthe. It is closely related to Gentiana puberulenta and differs in its smaller corolla and variable calyx morphology.
Conservation
Gentiana affinis is considered secure globally, with a conservation status of G5. While widespread, some regional populations vary in conservation rank, reflecting local habitat conditions and distribution patterns.
References
affinis Category:Flora of Northern America