Species Details

Allium tribracteatum

three-bracted onion

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Classification

Scientific Name: Allium tribracteatum Torr.
Common Name: three-bracted onion
Family:	Alliaceae
Element Code:	PMLIL022D0
USDA Plants Symbol:	ALTR2
Synonyms/Other Names:

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G2
State Rank:	S2
Other Status:	SB_SBBG; USFS_S
CRPR Changes:
Add Date:	1988-01-01
Date Edited:	2022-12-06

Ecology and Life History

Lifeform: perennial bulbiferous herb

Blooming Period: Apr-Aug

Elevation:
1100 - 3000 meters
3610 - 9845 feet

General Habitats:

Chaparral
Lower montane coniferous forest
Upper montane coniferous forest

Microhabitat Details:

Microhabitat:

Volcanic

Notes

Notes: Threatened by vehicles. See Report of the Pacific Railroad Expedition 4:148 (1857) for original description, and Aliso 11(1):27-35 (1985) for revised treatment.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	11
	Total EOs	% of EOs
EOs with Threat Listed:	23	61 %
ORV activity	12	31%
Logging	11	28%
Other	7	18%
Road/trail construction/maint.	6	15%
Recreational use (non-ORV)	5	13%
Vandalism/dumping/litter	4	10%
Non-native plant impacts	3	7%
Foot traffic/trampling	2	5%
Grazing	2	5%
Wood cutting or brush clearing	1	2%
Development	1	2%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					38
A	B	C	D	X	U
5	9	2	2	0	20

Occurrence Status:
Historical >20 Years	21
Recent <=20 Years	17

Presence:
Presumed Extant	38
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Alpine (ALP), Calaveras (CAL), El Dorado (ELD), Tuolumne (TUO)

Quads: Name (Quad Code)
Boards Crossing (3812032), Crandall Peak (3812022), Dardanelle (3811937), Devils Nose (3812044), Garnet Hill (3812043), Hull Creek (3812011), Kibbie Lake (3811917), Lake Eleanor (3711987), Liberty Hill (3812031), Mokelumne Peak (3812051), Pyramid Peak (3812072), Strawberry (3812021), Tamarack (3812041), Tiltill Mtn. (3811916), Tragedy Spring (3812062), Twain Harte (3812012)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Presumed Extant

Click on quad for name. Hold Shift Key to use mouse scroll wheel

CNPS Rare Plant Inventory