FWS Focus

Overview

Characteristics
Overview

The small whorled pogonia is a member of the orchid family. The plant is named for the whorl of five or six leaves near the top of the stem and beneath the flower. The species is listed as threatened under the Endangered Species Act. 

Scientific Name

Isotria medeoloides
Common Name
green fiveleaf orchid
small whorled pogonia
FWS Category
Flowering Plants
Kingdom

Location in Taxonomic Tree

Identification Numbers

TSN:

Characteristics

Characteristic category

Physical Characteristics

Characteristics
Size & Shape

The stem of the small whorled pogonia grows about 10 inches tall when in flower and about 14 inches tall when bearing fruit. Leaves of the orchid are oblong and 1 to 3.5 inches long. The fruit appears as an upright ellipsoid capsule. 

Measurements
Height: 10 to 14 inches (25 to 36 cm)
Leaf Length: 1 to 3.5 inches (2.5 to 9 cm)

Color & Pattern

The small whorled pogonia has a single stem and oblong leaves that are grayish-green in color. A single or paired green-yellow flower can be visible in May or June.  

Characteristic category

Life Cycle

Characteristics
Reproduction

The small whorled pogonia flowers from mid-May to mid-June, with the flowers lasting only a few days to a week. It may not flower every year but when it does flower, one or two flowers are produced per plant. If pollinated, a capsule forms that contains several thousand minute seeds. The pogonia appears to self-pollinate by mechanical processes. The flower lacks both nectar guides and fragrance and insect pollination has not been observed. 

Characteristic category

Habitat

Characteristics
Habitat

This orchid grows in older hardwood stands of beech, birch, maple, oak, and hickory that have an open understory. Sometimes it grows in stands of softwoods such as hemlock. It prefers acidic soils with a thick layer of dead leaves, often on slopes near small streams. 

Forest

A dense growth of trees and underbrush covering a large tract.

Geography

Characteristics
Range

Although widely distributed, the small whorled pogonia is rare. It is found in 18 eastern states and Ontario, Canada. Populations are typically small with less than 20 plants. It has been extirpated from Missouri, Vermont and Maryland. 

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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.

7 Items

Listing

Listing

Downlisting

Downlisting

Five Year Review

Five Year Review

Five Year Review

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Listing

Sep 11, 1980

Sep 11, 1980 Listing (Endangered)
Proposal to Determine Isotria meleoloides (Small Whorled Pogonia) to be an Endangered Species
  • Publication type: Proposed
Item 1

Listing

Sep 9, 1982

Sep 9, 1982 Listing (Endangered)
ETWP; Determination of Isotria medeoloides (small whorled pogonia) To Be an Ednangered Species
  • Publication type: Final
Item 2

Downlisting

Oct 19, 1993

Oct 19, 1993 Downlisting (Downlist Threatened)
ETWP; Proposed Rule To Reclassify the Plant Isotria Medeoloides (Small Whorled Pogonia) From Endange…
  • Publication type: Proposed
Item 3

Downlisting

Oct 6, 1994

Oct 6, 1994 Downlisting (Downlist Threatened)
ETWP; Final Rule to Reclassify the Plant Isotria medeoloides (Small Whorled Pogonia) From Endangered…
  • Publication type: Final
Item 4

Five Year Review

Jan 29, 2007

Jan 29, 2007 Five Year Review (Information Solicitation)
Initiation of a 5-Year Review of Ten Listed Northeastern Species
  • Publication type: Notice
Item 5

Five Year Review

Mar 6, 2012

Mar 6, 2012 Five Year Review (Information Solicitation)
Initiation of a 5-Year Review of Nine Northeastern Species. Notice of initiation of reviews; request…
  • Publication type: Notice
Item 6

Five Year Review

Nov 8, 2021

Nov 8, 2021 Five Year Review (Information Solicitation)
Initiation of 5- Year Reviews of Eight Northeastern Species; request for information
  • Publication type: Notice
Item 7