Taxon Report

Tiarella trifoliata L. var. trifoliata

trifoliate laceflower

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Taxon Summary

Tiarella trifoliata var. trifoliata, commonly known as trifoliate laceflower, is a perennial rhizomatous herb in the Saxifragaceae that is found in California and elsewhere. It occurs within Lower montane coniferous forest, and North Coast coniferous forest, growing at elevations from 170 to 1500 meters. Tiarella trifoliata var. trifoliata is ranked 3.2, Plants About Which We Need More Information, A Review List; Moderately threatened in California.

Classification


Scientific Name:	Tiarella trifoliata L. var. trifoliata
Common Name:	trifoliate laceflower
Family:	Saxifragaceae
Element Code:	PDSAX10031
USDA Plants Symbol:	TITRT
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial rhizomatous herb
Blooming Period: (May)Jun-Aug	(May)Jun-Aug
Elevation:	170-1500 (560-4920)
General Habitats:	Lower montane coniferous forest, North Coast coniferous forest
Microhabitat:	Edges, Streambanks
Microhabitat Details:	moist shady banks

Conservation Status


CA Rare Plant Rank:	3.2
Global Rank:	G5T5
State Rank:	S2S3
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	changed from 3 to 3.2 on 2012-08-03

Occurrence Data from the CNDDB


Total Occurrences:	0
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	0

Location


California Endemic: False
California Counties and Islands: Name (Code)
Del Norte (DNT), Humboldt (HUM), Mendocino (MEN)
Quads: Name (Quad Code)
Ah Pah Ridge (4112348), Blue Lake (4012388), Board Camp Mtn. (4012366), Briceland (4012318), Hiouchi (4112471), Johnsons (4112337), Korbel (4012378), Lord-ellis Summit (4012387), Maple Creek (4012377), Noyo Hill (3912346), Owl Creek (4012358), Scotia (4012441)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	0 %

Notes



Move to CRPR 2B? Location, rarity, and endangerment information needed, especially quads for TRI Co. Possibly threatened by logging, road maintenance, and recreational activities. Intergrades with var. unifoliata. See Madroño 18(5):152-160 (1966) for additional information.
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 1 July 2025].