Taxon Report

Piperia candida Morgan & Ackerman

white-flowered rein orchid

Print Report


©2016 Barry Rice

  Classification
Scientific Name:
 Piperia candida Morgan & Ackerman
Common Name:
 white-flowered rein orchid
Family: Orchidaceae
Element Code: PMORC1X050
USDA Plants Symbol: PICA13
Synonyms/Other Names:

Ecology and Life History
Lifeform: perennial herb
Blooming Period: (Mar-Apr)May-Sep (Mar-Apr)May-Sep
Elevation: 30-1310 (100-4300)
General Habitats: Broadleafed upland forest, Lower montane coniferous forest, North Coast coniferous forest
Microhabitat: Serpentine (sometimes)
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 1B.2
Global Rank: G3?
State Rank:
 S3
State List: None
Fed List: None
Other Status: BLM_S; SB_CalBG/RSABG
CRPR Changes:
  • changed from 4.3 to 1B.2 on 2007-10-01

Occurrence Data from the CNDDB
Total Occurrences: 222
Element Occurrence Ranks:
   Excellent (A) 7
   Good (B) 83
   Fair (C) 65
   Poor (D) 13
   None (X) 1
   Unknown (U) 53

Location
California Endemic:  False
California Counties and Islands: Name (Code)
Del Norte (DNT), Humboldt (HUM), Mendocino (MEN), San Mateo (SMT), Santa Clara (SCL), Santa Cruz (SCR), Siskiyou (SIS), Sonoma (SON), Trinity (TRI)
Quads: Name (Quad Code)
Annapolis (3812363), Bailey Ridge (3912324), Bald Hills (4112328), Bear Harbor (3912388), Big Basin (3712222), Big Foot Mtn. (3812372), Blake Mountain (4012355), Board Camp Mtn. (4012366), Briceland (4012318), Bridgeville (4012347), Broken Rib Mtn. (4112386), Buckeye Mtn. (4012432), Bull Creek (4012431), Burbeck (3912344), Cahto Peak (3912365), Cant Hook Mtn. (4112368), Castle Rock Ridge (3712221), Cazadero (3812351), Childs Hill (4112461), Cold Spring (3912315), Comptche (3912335), Crannell (4112411), Davenport (3712212), Eaton Peak (4112238), Elk (3912326), Ettersburg (4012328), Eureka Hill (3812385), Felton (3712211), Fish Lake (4112336), Forest Glen (4012333), Fort Seward (4012326), French Camp Ridge (4112327), Garberville (4012317), Gasquet (4112378), Greenough Ridge (3912334), Guerneville (3812258), Hales Grove (3912377), Harris (4012316), High Plateau Mtn. (4112388), Hiouchi (4112471), Holter Ridge (4112338), Honeydew (4012421), Hoopa (4112316), Hupa Mountain (4112317)?, Hurdygurdy Butte (4112377), Hyampom (4012354), Iaqua Buttes (4012368), Johnsons (4112337), Kangaroo Mtn. (4112382), Larabee Valley (4012346), Laytonville (3912364), Leggett (3912376), Lincoln Ridge (3912366), Longvale (3912354), Lord-ellis Summit (4012387), Mad River Buttes (4012367), Maple Creek (4012377), Mathison Peak (3912336), McGuire Ridge (3812374), Mindego Hill (3712232), Miranda (4012327), Myers Flat (4012337), Naufus Creek (4012343), Navarro (3912325), Noble Butte (3912386), Northspur (3912345), Ornbaun Valley (3812383), Orrs Springs (3912323), Philo (3912314), Piercy (3912387), Pony Buck Peak (4012331), Preston Peak (4112375), Rodgers Peak (4112421), Salyer (4012385), Sawyers Bar (4112332), Scotia (4012441), Seiad Valley (4112372), Shelly Creek Ridge (4112387), Sherwood Peak (3912355), Showers Mtn. (4012356), Sims Mountain (4012365), Smoky Creek (4012332), Somes Bar (4112344), Thurston Peaks (4012382), Weitchpec (4112326), Weott (4012338), Willits (3912343), Willow Creek (4012386), Zeni Ridge (3812384)

Threat List Data from the CNDDB

Threat List Total: 14
EOs with Threat Listed: Total EOs % of EOs
154 69 %
Logging 134 60%
Road/trail construction/maint. 54 24%
Other 16 7%
Foot traffic/trampling 7 3%
Non-native plant impacts 3 1%
ORV activity 2 0%
Grazing 2 0%
Altered flood/tidal/hydrologic regime 2 0%
Recreational use (non-ORV) 2 0%
Erosion/runoff 2 0%
Vandalism/dumping/litter 1 0%
Development 1 0%
Improper burning regime 1 0%
Mining 1 0%

Notes
Difficult to determine rarity as some populations rarely flower. Populations often have small numbers. Difficult to identify from herbarium material. 
Threats:
Threatened by logging, foot traffic, and road construction.
Taxonomy:

Selected References

Proposed Addition to CNPS List 1B.2
Lindleyana 5(4):205-211 (1990)
The Wild Orchids of California, p. 109-110 (1995) by R. Coleman 
Piperia candida profile for potential Species of Conservation Concern evaluation (2018)
USFS Potential Species of Conservation Concern Profile
Citation California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 December 2024].