Corallorhiza maculata (Raf.) Raf.

Spotted Coral Root

Facts About

Accepted Synonyms: Corallorhiza multiflora

Corallorhiza maculata, commonly known as Spotted Coral Root, is widely distributed across North America, its range spanning virtually all of Canada and the United States with the exception of the northernmost Canadian provinces and some southern U.S. states. Like other members of its genus, this orchid is myco-heterotrophic: it primarily obtains nutrients not from photosynthesis but through mycorrhizal fungi. It produces up to 41 flowers with brown, yellow, or reddish petals and a white labellum spotted with purple (from which it derives its common name). It grows in a wide variety of woodlands and forests, generally preferring those with limited herbaceous cover.

Corallorhiza maculata is considered globally secure, and is only considered rare in a few central plain states. It is most likely to be confused with C. trifida, from which it can be distinguished by the latter's smaller size and earlier blooming period.

Pollination

This orchid is capable of self-pollination after the flower has opened but insect pollination can occur before and after self-fertilization. An unidentified species of Empis has been recorded removing nectar from the flower and leaving with pollinia stuck to its thorax then depositing it on the stigma of a second flower. Mining bees in the genus Andrena have also been recorded as pollinators.

Notes on Subspecies and Varieties

Corallorhiza maculata has two varieties: Corallorhiza maculata var. maculata, which has an unexpanded middle lobe of the labellum, and Corallorhiza maculata var. occidentalis, which has a distinctly expanded middle lobe of the labellum. When they grow together, C. maculata var. occidentalis usually flowers several weeks earlier than C. maculata var. maculata.

Ecosystem Type

Forests, woodlands

Characteristics

Habitat:
terrestrial
Leaf arrangement:
this plant has no leaves
Number of leaves on stem:
absent
Form of the labellum:
the labellum is not pouch-like
Labellum outline:
the labellum is lobed
Main color of labellum:
white
Nectar spur:
absent
Inflorescence type:
the inflorescence is a raceme
Labellum characteristics:
the labellum is lobed
Labellum length:
4–9 mm
Sepal length:
4.7–15 mm
Plant height:
10–80 cm
Show All Characteristics

Native to North America

Yes

North American Conservation Status & Distribution

Conservation Status

Select a location to view conservation status:

Conservation and Wetland Status
Global Rank Secure
US Status N/A
Canadian Status Secure

North America Distribution

Adapted from USDA data