FWS Focus

Overview

Characteristics
Overview

The western prairie fringed orchid is federally protected under the Endangered Species Act as a threatened species. It is a member of the orchid family and is found in moist tallgrass prairies in Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, and Manitoba, Canada. The species appears to be extirpated from Oklahoma and South Dakota. The largest populations are found in North Dakota, Minnesota and Manitoba, Canada.

Main threats to the species include the conversion of remnant prairie to cropland, incompatible use of herbicides and pesticides, siltation, changes in hydrology, fire suppression, encroaching woody vegetation, and the spread of non-native, invasive plant species. Heavy grazing and early haying may also have detrimental impacts on populations (USFWS 2021, p. 12). Protecting known populations, applying prescribed burns and other activities are necessary to keep this orchid on the landscape. 

Scientific Name

Platanthera praeclara
Common Name
Great Plains white fringed orchid
western prairie fringed orchid
FWS Category
Flowering Plants
Kingdom

Location in Taxonomic Tree

Identification Numbers

TSN:

Characteristics

Characteristic category

Habitat

Characteristics
Habitat

The western prairie fringed orchid occurs in moist tallgrass prairies and sedge meadows. In North Dakota, it is commonly found with sedges, reedgrass, and rushes or where those plants meet big bluestem, little bluestem, and switchgrass. The western prairie fringed orchid is well adapted to survive fires. Light grazing does not appear to negatively affect the western prairie fringed orchid, although researchers are still studying the relationship.

Grassland

Land on which the natural dominant plant forms are grasses and forbs.

Rural

Environments influenced by humans in a less substantial way than cities. This can include agriculture, silviculture, aquaculture, etc.

Wetland

Areas such as marshes or swamps that are covered often intermittently with shallow water or have soil saturated with moisture.

Characteristic category

Life Cycle

Characteristics
Life Cycle

The western prairie fringed orchid is distinguished by large, creamy white flowers that come from a single stem. Up to 24 flowers may occur on a single plant. The flower is fringed on the margins, giving it a feathery appearance. Plants have 2 to 5 thick, narrow leaves that hug the stem (USFWS 1996, p.1).

Life Span

The western prairie fringed orchid is a perennial; however, differences exist between North Dakota and Minnesota populations in how long an individual plant lives. In North Dakota, most plants live 3 years or less and show higher rates of mortality than Minnesota plants (USFWS 1996, p. 9).

Reproduction

The nocturnally fragrant flowers of these perennial orchids attract hawkmoths that feed on nectar and transfer pollen from flower to flower and plant to plant. Seed germination and proper plant growth depend on a symbiotic relationship between the plants' reduced root systems and a soil-inhabiting fungus for proper water uptake and nutrition.

Characteristic category

Physical Characteristics

Characteristics
Color & Pattern

The western prairie fringed orchid is distinguished by large, creamy white flowers that come from a single stem. Up to 24 flowers may occur on a single plant. The flower is fringed on the margins, giving it a feathery appearance. Plants have 2 to 5 thick, narrow leaves that hug the stem (USFWS 1996, p.1).

Size & Shape

Western prairie fringed orchids produce flower stalks up to 4 feet (1.19 meters) tall. Each stalk has up to 40 flowers each about an inch (2.5 centimeters) long (USFWS 1996, p. 1).

Physical Characteristics

The western prairie fringed orchid occurs in moderately moist (mesic) tallgrass prairies and sedge meadows with level or gently sloping topography. The species may also be found in old fields and roadside ditches (USFWS 1996, p. 4). In North Dakota, it is commonly found with sedges, reedgrass, and rushes or where those plants meet big bluestem, little bluestem, and switchgrass. Western prairie fringed orchids rely on specific soil fungi for seedling establishment and plant growth. 

Characteristic category

Similar Species

Characteristics
Similar Species

The eastern prairie fringed orchid is similar to the western prairie fringed orchid; however, it primarily inhabits areas east of the Mississippi River. The eastern prairie fringed orchid is also listed as a threatened plant.

Geography

Characteristics
Range

The western prairie fringed orchid is restricted to west of the Mississippi River and currently occurs in Iowa, Kansas, Minnesota, Nebraska, North Dakota, and in Manitoba, Canada.

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Timeline

Explore the information available for this taxon's timeline. You can select an event on the timeline to view more information, or cycle through the content available in the carousel below.

6 Items

Listing

Listing

Five Year Review

Five Year Review

Five Year Review

Five Year Review

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Listing

Oct 11, 1988

Oct 11, 1988 Listing (Threatened)
Proposal to Determine Platanthera leucophaea (Eastern Prairie Fringed Orchid) & Plantanthera pra…
  • Publication type: Proposed
Item 1

Listing

Sep 28, 1989

Sep 28, 1989 Listing (Threatened)
ETWP; Determination of Threatened Status for Eastern and Western Prairie Fringed Orchids; 54 FR 3985…
  • Publication type: Final
Item 2

Five Year Review

Mar 30, 2006

Mar 30, 2006 Five Year Review (Information Solicitation)
5-Year Review of Five Midwestern Species
  • Publication type: Notice
Item 3

Five Year Review

Sep 14, 2010

Sep 14, 2010 Five Year Review (Information Solicitation)
5-Year Status Reviews of Seven Midwest Species; Notice of initiation of reviews; request for informa…
  • Publication type: Notice
Item 4

Five Year Review

Dec 17, 2015

Dec 17, 2015 Five Year Review (Information Solicitation)
Endangered and Threatened Wildlife and Plants; Initiation of 5-Year Status Reviews of One Listed Ani…
  • Publication type: Notice
Item 5

Five Year Review

Aug 31, 2020

Aug 31, 2020 Five Year Review (Information Solicitation)
Initiation of 5-Year Status Reviews of 14 Listed Animal and Plant Species
  • Publication type: Notice
Item 6