Platanthera shriveri P.M. Brown

Shriver's Frilly Orchid

Facts About

Accepted Synonym: Blephariglottis shriveri

Platanthera shriveri, Shriver's Frilly Orchid, is a recently described species of possible hybrid origin with P. grandiflora and P. lacera as parents. Field observations and examination of herbarium records indicate this orchid may be endemic to the Appalachian region with a historical range from North Carolina to Pennsylvania. Recently this species has been reported in western Maryland.

Platanthera shriveri can be distinguished from the other purple fringed orchids by morphology and flowering date. The inflorescence of this orchid has an open, lax appearance with empty spaces between the flowers. The lip is deeply fringed and the erect, spreading petals also have lacerate margins. The orientation of the long, ascending nectar spur is unique among the purple fringed orchids. This orchid flowers in mid-July to early August, about three weeks later than Platanthera grandiflora in sympatric areas.


Most of the large, colorful Platanthera orchids in North America are pollinated by a variety of butterflies, day-flying moths and skippers in search of nectar. Evidence of pipevine swallowtails, Battus philenor, pollinating this orchid is quite recent and it is suspected that other large butterflies may also serve as pollinators.

Ecosystem Type

Forests, stream bank, woodlands


Leaf arrangement:
Number of leaves on stem:
  • three
  • four
Form of the labellum:
the labellum is not pouch-like
Labellum outline:
the labellum is fringed
Main color of labellum:
  • blue to purple
  • pink to red
Nectar spur:
Inflorescence type:
the inflorescence is a raceme
Labellum characteristics:
  • the labellum has a spur
  • the labellum is fringed
  • the labellum is lobed
Labellum length:
13–20 mm
Plant height:
35–110 cm
Show All Characteristics

Native to North America


North American Conservation Status & Distribution

Conservation Status

Select a location to view conservation status:

Conservation and Wetland Status
Global Rank Critically Imperiled
US Status N/A
Canadian Status N/A

North America Distribution

Adapted from USDA data