Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 10 accessions of Allium munzii in orthodox seed collection. There are as many as 10113 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.
Based on an August 2020 extract of the California Plant Rescue Database, California Botanic Garden has collected 9 seed accessions of Allium munzii from 7 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 233 maternal plants
Allium munzii is narrowly endemic to western Riverside County in southern California. Munz's onion is known from fifteen extant populations. It is extremely threatened by rapid and extensive urbanization, dry land farming activities, competition from non-native plants throughout its entire range, and off-road vehicle activities throughout a significant portion of its range. Other threats include, clay mining and grazing (CNPS 2001).
Development (both urban and agricultural)
Dryland farming activities
Fire suppression actions (i.e.. bulldozing and disking)
Grazing by cattle and sheep
13 populations in Western Riverside County CA, including the Gavilan Hills, Harford Springs County Park, Paloma Valley, Skunk Hollow, Domenigoni Hills, Bachelor Mountain and the Elsinore Mountains. It is estimated that the total number of plants is somewhere between 20,000 to 70,000 individuals. (USFWS 1998)
A few of the known populations occur on land managed by the Reserve Management Committees for the Riverside County multispecies plans, but a number of others occur on private lands with no management. One population occurs on Federal land. (USFWS 1998)
An inventory of all populations
Surveys of potential habitat
Maintain genetically representative seed bank.
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