Taxon Report

Piperia yadonii Morgan & Ackerman

Yadon's rein orchid

Print Report

Taxon Summary

Piperia yadonii, commonly known as Yadon's rein orchid, is a perennial herb in the Orchidaceae that is found only in California. It occurs within Chaparral (maritime), Closed-cone coniferous forest, and Coastal bluff scrub, growing at elevations from 10 to 510 meters. Piperia yadonii is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Piperia yadonii Morgan & Ackerman
Common Name:	Yadon's rein orchid
Family:	Orchidaceae
Element Code:	PMORC1X070
USDA Plants Symbol:	PIYA
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: (Feb)May-Aug	(Feb)May-Aug
Elevation:	10-510 (35-1675)
General Habitats:	Chaparral, Closed-cone coniferous forest, Coastal bluff scrub
Microhabitat:	Sandy
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G1
State Rank:	S1
State List:	None
Fed List:	FE
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	26
Element Occurrence Ranks:
Excellent (A)	2
Good (B)	8
Fair (C)	5
Poor (D)	2
None (X)	1
Unknown (U)	8

Location


California Endemic: True
California Counties and Islands: Name (Code)
Monterey (MNT)
Quads: Name (Quad Code)
Marina (3612167)*, Monterey (3612158), Moss Landing (3612177), Mt. Carmel (3612147), Prunedale (3612176), Seaside (3612157), Soberanes Point (3612148)

Threat List Data from the CNDDB


Threat List Total:	9
EOs with Threat Listed:	Total EOs	% of EOs
	19	73 %
Development	13	50%
Other	8	30%
Foot traffic/trampling	7	26%
Non-native plant impacts	5	19%
Road/trail construction/maint.	5	19%
Recreational use (non-ORV)	2	7%
Erosion/runoff	2	7%
Feral pigs	1	3%
Wood cutting or brush clearing	1	3%

Notes



Threatened by urbanization, recreational development, non-native plants, road maintenance, and herbivory. See Lindleyana 5(4):205-211 (1990) for original description, and The Wild Orchids of California, p. 134-135 (1995) by R. Coleman for species account.
Threats:

Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 29 October 2025].