Isotria verticillata (Muhl. ex Willd.) Raf.
Large Whorled Pogonia
Facts About
Accepted Synonyms: Arethusa verticillata, Pogonia verticillata
Isotria verticillata, commonly called Large Whorled Pogonia, is found throughout the central and eastern United States, from Texas to Maine, and in Ontario. It has a purplish brown stem and 5 leaves which form a whorled ring around the upper part of the stem. The leaves are green on the upper surface, and occasionally greyish blue or green on the bottom surface. It produces 1-2 flowers with purple-brown sepals, yellowish green petals, and a yellow-green to white labellum, which is often striped with purple. It can be distinguished from I. medeoloides by its larger size and its purple, instead of green, sepals. It is known to form extensive clonal groups and can be found in mesic to dry forests and woodlands, and occasionally in bogs.
Isotria verticillata is considered globally secure, but may be rare or vulnerable around the southern, western, and northern edges of its range.
Pollination
This orchid is pollinated by bees, including Andrena ceanothi, Andrena miranda, Andrena nasonii, Augochlora pura, Lasioglossum cressonii and Nomada sayi which are attracted by the flowers' nectar guides, even though they provides no nectar. The pollinator lands on the flower and enters through the floral tube in search of nectar. The pollinator goes under the anther to the stigma where it gets a sticky substance on its thorax. As the pollinator is leaving the flower it passes by the anther and pollen is then stuck to the sticky substance on the thorax. The pollen is then transferred to the stigma of another flower.
Ecosystem Type
Disturbed habitats, forests, woodlands
Characteristics
- Habitat:
- terrestrial
- Leaf arrangement:
- whorled
- Number of leaves on stem:
-
- five
- six
- Form of the labellum:
- the labellum is not pouch-like
- Labellum outline:
- the labellum is lobed
- Main color of labellum:
-
- blue to purple
- green to brown
- white
- yellow
- Nectar spur:
- absent
- Inflorescence type:
- the inflorescence has one flower or a pair of flowers
- Labellum characteristics:
- the labellum is lobed
- Labellum length:
- 15–25 mm
- Sepal length:
- 34–67 mm
- Plant height:
- 4–40 cm
-
Flowers
- Flower petal color:
-
- green
- yellow
- Flower symmetry:
- the flower is zygomorphic
- Flowering date:
-
- April
- May
- June
- Flowers per inflorescence:
- 1–2
- Form of the labellum:
- the labellum is not pouch-like
- Hairs on flower stalk:
- the pedicel is hairless
- Hairs on inflorescence axis:
- the inflorescence stem is hairless
- Inflorescence type:
- the inflorescence has one flower or a pair of flowers
- Labellum characteristics:
- the labellum is lobed
- Labellum length:
- 15–25 mm
- Labellum outline:
- the labellum is lobed
- Labellum position:
- the flowers are resupinate
- Length of flower stalk:
- 20–55 mm
- Length of peduncle:
- 20–55 mm
- Lower petal strongly red-veined:
- no
- Main color of labellum:
-
- blue to purple
- green to brown
- white
- yellow
- Nectar spur:
- absent
- Number of stamens:
- 1
- Orientation of side petals:
-
- the lateral petals are ascending
- the lateral petals are spreading
- Pollen sacs:
- the pollinia remain intact and do not fragment into smaller parts
- Self-pollinating flowers:
- there are no cleistogamous flowers
- Sepal length:
- 34–67 mm
- Sepals fused only to sepals:
- the sepals are separate from one another
- Spots on labellum:
- no
-
Fruits or seeds
- Fruit length:
- 20–42 mm
- Fruit width:
- 5–10 mm
- Length of peduncle when in fruit:
- 20–55 mm
- Seed capsule orientation:
- the capsule points upwards or outwards
-
Growth form
- Plant height:
- 4–40 cm
- Roots:
- the rhizomes are non-coralloid
- Underground organs:
-
- slender roots
- this plant has a rhizome
- myco-heterotrophic or not:
- the plant is chlorophyllous
-
Leaves
- Bract relative length:
- no bract associated with flower is present
- Leaf arrangement:
- whorled
- Leaf blade edges:
- the leaf edges are entire
- Leaf blade length:
- 25–100 mm
- Leaf blade length to width ratio:
- 1.9–2.5
- Leaf blade shape:
-
- elliptic
- lanceolate
- obovate
- Leaf blade tip:
-
- the tip of the leaf blade is acuminate
- the tip of the leaf blade is obtuse
- Leaf blade width:
- 10–53 mm
- Leaves during flowering:
- leaves are present during flowering
- Number of leaves on stem:
-
- five
- six
-
Place
- Ecosystem type:
-
- disturbed habitats
- forests
- woodlands
- Habitat:
- terrestrial
- Location:
-
- Alabama
- Arkansas
- Connecticut
- Delaware
- District of Columbia
- Florida
- Georgia
- Illinois
- Indiana
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Mississippi
- Missouri
- New Hampshire
- New Jersey
- New York
- North Carolina
- Ohio
- Oklahoma
- Ontario
- Pennsylvania
- Rhode Island
- South Carolina
- Tennessee
- Texas
- Vermont
- Virginia
- West Virginia
-
Facts and Uses
- Mycorrhiza
- Monitoring
- Propagation
- Restoration
Native to North America
Yes
North American Conservation Status & Distribution
Conservation Status
Conservation and Wetland Status | |
---|---|
Global Rank | Secure |
US Status | N/A |
Canadian Status | Endangered |
Conservation status for: Alabama | |
---|---|
Global Rank | Secure |
US Status | N/A |
Alabama Rank | State Rare |
Alabama Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |
Conservation status for: Arkansas | |
---|---|
Global Rank | Secure |
US Status | N/A |
Arkansas Rank | N/A |
Arkansas Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative |
Conservation status for: Connecticut | |
---|---|
Global Rank | Secure |
US Status | N/A |
Connecticut Rank | N/A |
Connecticut Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative |
Conservation status for: District of Columbia | |
---|---|
Global Rank | Secure |
US Status | N/A |
District of Columbia Rank | N/A |
District of Columbia Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |
Conservation status for: Delaware | |
---|---|
Global Rank | Secure |
US Status | N/A |
Delaware Rank | Watch List |
Delaware Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |
Conservation status for: Florida | |
---|---|
Global Rank | Secure |
US Status | N/A |
Florida Rank | Highly State Rare |
Florida Status | Endangered |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |
Conservation status for: Georgia | |
---|---|
Global Rank | Secure |
US Status | N/A |
Georgia Rank | Watch List |
Georgia Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |
Conservation status for: Illinois | |
---|---|
Global Rank | Secure |
US Status | N/A |
Illinois Rank | Highly State Rare |
Illinois Status | Endangered |
Canadian Status | Endangered |
Wetland Status | Facultative |
Conservation status for: Indiana | |
---|---|
Global Rank | Secure |
US Status | N/A |
Indiana Rank | Watch List |
Indiana Status | Species of Concern |
Canadian Status | Endangered |
Wetland Status | Facultative |
Conservation status for: Kentucky | |
---|---|
Global Rank | Secure |
US Status | N/A |
Kentucky Rank | Apparently Secure |
Kentucky Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative |
Conservation status for: Louisiana | |
---|---|
Global Rank | Secure |
US Status | N/A |
Louisiana Rank | Watch List |
Louisiana Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |
Conservation status for: Massachusetts | |
---|---|
Global Rank | Secure |
US Status | N/A |
Massachusetts Rank | N/A |
Massachusetts Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative |
Conservation status for: Maryland | |
---|---|
Global Rank | Secure |
US Status | N/A |
Maryland Rank | N/A |
Maryland Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |
Conservation status for: Maine | |
---|---|
Global Rank | Secure |
US Status | N/A |
Maine Rank | Presumed Extirpated |
Maine Status | Extirpated |
Canadian Status | Endangered |
Wetland Status | Facultative |
Conservation status for: Michigan | |
---|---|
Global Rank | Secure |
US Status | N/A |
Michigan Rank | State Rare |
Michigan Status | Threatened |
Canadian Status | Endangered |
Wetland Status | Facultative |
Conservation status for: Missouri | |
---|---|
Global Rank | Secure |
US Status | N/A |
Missouri Rank | Highly State Rare |
Missouri Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative |
Conservation status for: Mississippi | |
---|---|
Global Rank | Secure |
US Status | N/A |
Mississippi Rank | Watch List |
Mississippi Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |
Conservation status for: North Carolina | |
---|---|
Global Rank | Secure |
US Status | N/A |
North Carolina Rank | State Rare |
North Carolina Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |
Conservation status for: New Hampshire | |
---|---|
Global Rank | Secure |
US Status | N/A |
New Hampshire Rank | Highly State Rare |
New Hampshire Status | Endangered |
Canadian Status | Endangered |
Wetland Status | Facultative |
Conservation status for: New Jersey | |
---|---|
Global Rank | Secure |
US Status | N/A |
New Jersey Rank | N/A |
New Jersey Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |
Conservation status for: New York | |
---|---|
Global Rank | Secure |
US Status | N/A |
New York Rank | N/A |
New York Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |
Conservation status for: Ohio | |
---|---|
Global Rank | Secure |
US Status | N/A |
Ohio Rank | N/A |
Ohio Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative |
Conservation status for: Oklahoma | |
---|---|
Global Rank | Secure |
US Status | N/A |
Oklahoma Rank | Highly State Rare |
Oklahoma Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |
Conservation status for: Ontario | |
---|---|
Global Rank | Secure |
US Status | N/A |
Ontario Rank | Highly State Rare |
Ontario Status | N/A |
Canadian Status | Endangered |
Wetland Status | N/A |
Conservation status for: Pennsylvania | |
---|---|
Global Rank | Secure |
US Status | N/A |
Pennsylvania Rank | N/A |
Pennsylvania Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |
Conservation status for: Rhode Island | |
---|---|
Global Rank | Secure |
US Status | N/A |
Rhode Island Rank | N/A |
Rhode Island Status | Species of Concern |
Canadian Status | Endangered |
Wetland Status | Facultative |
Conservation status for: South Carolina | |
---|---|
Global Rank | Secure |
US Status | N/A |
South Carolina Rank | N/A |
South Carolina Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |
Conservation status for: Tennessee | |
---|---|
Global Rank | Secure |
US Status | N/A |
Tennessee Rank | N/A |
Tennessee Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative |
Conservation status for: Texas | |
---|---|
Global Rank | Secure |
US Status | N/A |
Texas Rank | Highly State Rare |
Texas Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |
Conservation status for: Virginia | |
---|---|
Global Rank | Secure |
US Status | N/A |
Virginia Rank | N/A |
Virginia Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |
Conservation status for: Vermont | |
---|---|
Global Rank | Secure |
US Status | N/A |
Vermont Rank | State Rare |
Vermont Status | Threatened |
Canadian Status | Endangered |
Wetland Status | Facultative |
Conservation status for: West Virginia | |
---|---|
Global Rank | Secure |
US Status | N/A |
West Virginia Rank | N/A |
West Virginia Status | N/A |
Canadian Status | Endangered |
Wetland Status | Facultative Upland |