Platanthera integra - Yellow Fringeless Orchid Home - Plant Profiles & Photos

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Older scientific names for Platanthera integra include:  Gymnadeniopsis integra, Habenaria integra.

This plant is on the The New Jersey Natural Heritage Program "List of Endangered Plant Species and Plant Species of Concern". For more information click "More info" button above or scroll down to the bottom.

Platanthera integra, yellow fringeless orchid, is a native herbaceous perennial plant that grows in wet areas of the pine barrens, savannas, and sandy woods. It blooms in July, August.


The yellow to orange flowers grow in a dense cluster that forms a spike (flowers are sessile) on an upright stalk. Each flower has three sepals that are rounded and have smooth margins. It also has 3 petals. The petals have crenulated (wavy and notched) margins that can be easily seen on the distinctive third petal, lip/labellum. A spur is connected to the back of the lip that contains nectar.

The first photo in this section shows a flower cluster. The flowers mature from the bottom.

The next two side view photos show the relative spur and bract lengths. Also seen are the crenulations of the labellum

The front view closeup shows all the sepals and petals. You can see the mouth of the spur at the base of the lip. When an insect reaches in to obtain the nectar it at the same time comes into contact with the pollen and stigma.

Platanthera integra - Yellow / Orange Fringeless Orchid - Flower cluster, infloresence

Platanthera integra - Yellow / Orange Fringeless Orchid -  flower closeup - side view - spur
Platanthera integra - Yellow / Orange Fringeless Orchid -  flower closeup - side view - bract
Platanthera integra - Yellow / Orange Fringeless Orchid -  flower closeup: front view - lip labellum, 3 sepals, 3 petals, spur opening



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Plant and leaves

Platanthera integra - Yellow / Orange Fringeless Orchid: entire plant The plant has a single erect stalk with a cluster of flowers on top that form a spike. The plant is 1- 2 ft tall. Along the stem are narrow lanceolate sheathing leaves, larger at the base and rapidly reduced to bracts upward. This can be seen in the first photo with three plants. The next three photos show close ups of a bract, a lower leaf and a bunch of lower leaves from 3 plants.
Platanthera integra - Yellow / Orange Fringeless Orchid : bract along stem Platanthera integra - Yellow / Orange Fringeless Orchid : lower leaf Platanthera integra - Yellow / Orange Fringeless Orchid : bottom leaves

All photos by H & M Ling, 8/5/2017, Pine barrens NJ.

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Additional information

Additional information / references:

Distribution and Prevalence: 

The USDA website shows the NJ population of P. integra is a northern outlier.

New Jersey report on P. integra:

New Jersey Heritage Natural Heritage Program: P. integra is in the endangered plant species list with these classifications: G3G4, S1, E, LP, HL
G3=Either very rare and local throughout its range or found locally in a restricted range or because of other factors making it vulnerable to extinction throughout it's range; with the number of occurrences in the range of 21 to 100..
G4=Apparently secure globally; although it may be quite rare in parts of its range, especially at the periphery.
S1=Critically imperiled in New Jersey because of extreme rarity.
E=Native New Jersey plant species whose survival in the State or nation is in jeopardy.
LP=Indicates taxa listed by the Pinelands Commission as endangered or threatened within their legal jurisdiction,
HL=Indicates taxa or ecological communities protected by the Highlands Water Protection and Planning Act within the jurisdiction of the Highlands Preservation Area

NJ Heritage Natural Heritage Program overview:
NJ Heritage Natural Heritage Program list of endangered plants:
NJ Heritage Natural Heritage Program status codes:

The NatureServe website shows P. integra is S1 or S2 or S3 in all the states that it is found in

Other References 

Flora of North America:

Go Orchids:

Florida's Native and Naturalized Orchids: More photos:

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