Malaxis unifolia Michx.
Green Adder's Mouth
Facts About
Accepted Synonym: Microstylis unifolia
Malaxis unifolia, commonly known as Green Adder's Mouth, is widely distributed across central and eastern Canada and the U.S., from Texas to Newfoundland. It is a small orchid, no more than 50 cm tall, and produces one or rarely two glossy leaves mid-way up the stem, with a sheathing base that reaches down to the stem's swollen base. It produces up to 160 small green flowers, with a three-lobed labellum and strongly recurved lateral petals. It flowers in spring and early summer in the northern part of its range, while in the south it blooms later into the fall. It can be distinguished from M. monophyllos by its three-lobed labellum, and generally grows in swamps and bogs, habitats too moist for M. bayardii, although it can be found in drier woodlands and forests.
Malaxis unifolia is considered globally secure, although it may be rare in a few central U.S. states.
Pollination
This orchid is pollinated by species of Aedes (mosquitoes), Bradysia (fungus gnats) and Trioxys (parasitic wasps). A gall midge (Cecidomyiidae) has been observed with pollinium attached to its head and crawling toward the column.
Ecosystem Type
Bogs, forests, swamps, woodlands
Characteristics
- Habitat:
- terrestrial
- Leaf arrangement:
- alternate
- Number of leaves on stem:
-
- one
- two
- Form of the labellum:
- the labellum is not pouch-like
- Labellum outline:
- the labellum is lobed
- Main color of labellum:
- green to brown
- Nectar spur:
- absent
- Inflorescence type:
- the inflorescence is a raceme
- Labellum characteristics:
- the labellum is lobed
- Labellum length:
- 1.1–2.3 mm
- Sepal length:
- 1.1–3 mm
- Plant height:
- 3–35 cm
-
Flowers
- Floral bract length:
- 0.16–1.4 mm
- Flower petal color:
- green
- Flower symmetry:
- the flower is zygomorphic
- Flowering date:
-
- February
- March
- April
- May
- June
- July
- August
Malaxis unifolia may flower as early as February in Florida and as late as August in the north.
- Flowers per inflorescence:
- 10–160
- 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 length:
- 10–130 mm
- Inflorescence type:
- the inflorescence is a raceme
- Labellum characteristics:
- the labellum is lobed
- Labellum length:
- 1.1–2.3 mm
- Labellum outline:
- the labellum is lobed
- Labellum position:
- the flowers are resupinate
- Length of flower stalk:
- 3.8–13 mm
- Lobes at base of labellum:
- 0.4–1.1 mm
- Lower petal strongly red-veined:
- no
- Main color of labellum:
- green to brown
- Nectar spur:
- absent
- Number of stamens:
- 1
- Orientation of side petals:
- 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:
- 1.1–3 mm
- Sepals fused only to sepals:
- the sepals are separate from one another
- Spots on labellum:
- no
-
Fruits or seeds
- Fruit length:
- Up to 8 mm
- Fruit width:
- Up to 4 mm
- Seed capsule orientation:
-
- the capsule bends downwards
- the capsule points upwards or outwards
-
Growth form
- Plant height:
- 3–35 cm
- Roots:
- the rhizomes are non-coralloid
- Underground organs:
-
- slender roots
- the plant has one or more swollen storage organs underground, such as bulbs, tubers or corms
- myco-heterotrophic or not:
- the plant is chlorophyllous
-
Leaves
- Bract relative length:
- bracts may be variable, both longer and shorter than the flower
- Leaf arrangement:
- alternate
- Leaf blade edges:
- the leaf edges are entire
- Leaf blade length:
- 16–100 mm
- Leaf blade length to width ratio:
- 2–3
- Leaf blade shape:
- ovate
- Leaf blade tip:
- the tip of the leaf blade is acute
- Leaf blade width:
- 5–50 mm
- Leaves during flowering:
- leaves are present during flowering
- Number of leaves on stem:
-
- one
- two
-
Place
- Ecosystem type:
-
- bogs
- forests
- swamps
- woodlands
- Habitat:
- terrestrial
- Location:
-
- Alabama
- Arkansas
- Connecticut
- Delaware
- District of Columbia
- Florida
- Georgia
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Manitoba
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- New Brunswick
- New Hampshire
- New Jersey
- New York
- Newfoundland and Labrador
- North Carolina
- Nova Scotia
- Ohio
- Oklahoma
- Ontario
- Pennsylvania
- Prince Edward Island
- Quebec
- Rhode Island
- South Carolina
- Tennessee
- Texas
- Vermont
- Virginia
- West Virginia
- Wisconsin
-
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 | Secure |
Conservation status for: Alabama | |
---|---|
Global Rank | Secure |
US Status | N/A |
Alabama Rank | N/A |
Alabama Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Arkansas | |
---|---|
Global Rank | Secure |
US Status | N/A |
Arkansas Rank | N/A |
Arkansas Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Connecticut | |
---|---|
Global Rank | Secure |
US Status | N/A |
Connecticut Rank | N/A |
Connecticut Status | Endangered |
Canadian Status | Secure |
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 | Secure |
Wetland Status | Facultative |
Conservation status for: Delaware | |
---|---|
Global Rank | Secure |
US Status | N/A |
Delaware Rank | Highly State Rare |
Delaware Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Florida | |
---|---|
Global Rank | Secure |
US Status | N/A |
Florida Rank | Watch List |
Florida Status | Endangered |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Georgia | |
---|---|
Global Rank | Secure |
US Status | N/A |
Georgia Rank | Apparently Secure |
Georgia Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Iowa | |
---|---|
Global Rank | Secure |
US Status | N/A |
Iowa Rank | Presumed Extirpated |
Iowa Status | Species of Concern |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Illinois | |
---|---|
Global Rank | Secure |
US Status | N/A |
Illinois Rank | Highly State Rare |
Illinois Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Indiana | |
---|---|
Global Rank | Secure |
US Status | N/A |
Indiana Rank | Highly State Rare |
Indiana Status | Endangered |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Kansas | |
---|---|
Global Rank | Secure |
US Status | N/A |
Kansas Rank | Highly State Rare |
Kansas Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Kentucky | |
---|---|
Global Rank | Secure |
US Status | N/A |
Kentucky Rank | Apparently Secure |
Kentucky Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Louisiana | |
---|---|
Global Rank | Secure |
US Status | N/A |
Louisiana Rank | Apparently Secure |
Louisiana Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Massachusetts | |
---|---|
Global Rank | Secure |
US Status | N/A |
Massachusetts Rank | N/A |
Massachusetts Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Manitoba | |
---|---|
Global Rank | Secure |
US Status | N/A |
Manitoba Rank | State Rare |
Manitoba Status | N/A |
Canadian Status | Secure |
Wetland Status | N/A |
Conservation status for: Maryland | |
---|---|
Global Rank | Secure |
US Status | N/A |
Maryland Rank | State Rare |
Maryland Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Maine | |
---|---|
Global Rank | Secure |
US Status | N/A |
Maine Rank | N/A |
Maine Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Michigan | |
---|---|
Global Rank | Secure |
US Status | N/A |
Michigan Rank | N/A |
Michigan Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Minnesota | |
---|---|
Global Rank | Secure |
US Status | N/A |
Minnesota Rank | N/A |
Minnesota Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Missouri | |
---|---|
Global Rank | Secure |
US Status | N/A |
Missouri Rank | Watch List |
Missouri Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Mississippi | |
---|---|
Global Rank | Secure |
US Status | N/A |
Mississippi Rank | N/A |
Mississippi Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: New Brunswick | |
---|---|
Global Rank | Secure |
US Status | N/A |
New Brunswick Rank | Secure |
New Brunswick Status | N/A |
Canadian Status | Secure |
Wetland Status | N/A |
Conservation status for: North Carolina | |
---|---|
Global Rank | Secure |
US Status | N/A |
North Carolina Rank | Apparently Secure |
North Carolina Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: New Hampshire | |
---|---|
Global Rank | Secure |
US Status | N/A |
New Hampshire Rank | State Rare |
New Hampshire Status | Threatened |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: New Jersey | |
---|---|
Global Rank | Secure |
US Status | N/A |
New Jersey Rank | Possible Extirpated |
New Jersey Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Newfoundland and Labrador | |
---|---|
Global Rank | Secure |
US Status | N/A |
Newfoundland and Labrador Rank | N/A |
Newfoundland and Labrador Status | N/A |
Canadian Status | Secure |
Wetland Status | N/A |
Conservation status for: Nova Scotia | |
---|---|
Global Rank | Secure |
US Status | N/A |
Nova Scotia Rank | Secure |
Nova Scotia Status | N/A |
Canadian Status | Secure |
Wetland Status | N/A |
Conservation status for: New York | |
---|---|
Global Rank | Secure |
US Status | N/A |
New York Rank | N/A |
New York Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Ohio | |
---|---|
Global Rank | Secure |
US Status | N/A |
Ohio Rank | Watch List |
Ohio Status | N/A |
Canadian Status | Secure |
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 | Secure |
Wetland Status | Facultative |
Conservation status for: Ontario | |
---|---|
Global Rank | Secure |
US Status | N/A |
Ontario Rank | Secure |
Ontario Status | N/A |
Canadian Status | Secure |
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 | Secure |
Wetland Status | Facultative |
Conservation status for: Prince Edward Island | |
---|---|
Global Rank | Secure |
US Status | N/A |
Prince Edward Island Rank | Watch List |
Prince Edward Island Status | N/A |
Canadian Status | Secure |
Wetland Status | N/A |
Conservation status for: Quebec | |
---|---|
Global Rank | Secure |
US Status | N/A |
Quebec Rank | Secure |
Quebec Status | N/A |
Canadian Status | Secure |
Wetland Status | N/A |
Conservation status for: Rhode Island | |
---|---|
Global Rank | Secure |
US Status | N/A |
Rhode Island Rank | N/A |
Rhode Island Status | Endangered |
Canadian Status | Secure |
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 | Secure |
Wetland Status | Facultative |
Conservation status for: Tennessee | |
---|---|
Global Rank | Secure |
US Status | N/A |
Tennessee Rank | N/A |
Tennessee Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Texas | |
---|---|
Global Rank | Secure |
US Status | N/A |
Texas Rank | N/A |
Texas Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Virginia | |
---|---|
Global Rank | Secure |
US Status | N/A |
Virginia Rank | N/A |
Virginia Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Vermont | |
---|---|
Global Rank | Secure |
US Status | N/A |
Vermont Rank | State Rare |
Vermont Status | N/A |
Canadian Status | Secure |
Wetland Status | Facultative |
Conservation status for: Wisconsin | |
---|---|
Global Rank | Secure |
US Status | N/A |
Wisconsin Rank | N/A |
Wisconsin Status | N/A |
Canadian Status | Secure |
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 | Secure |
Wetland Status | Facultative |