Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 6 accessions of Pentachaeta lyonii in orthodox seed collection. There are as many as 187986 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 3 seed accessions of Pentachaeta lyonii from 2 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass an unknown number of maternal plants
urban development including construction of housing, golf courses and infrastructure trampling from hikers, off-road vehicles, and equestrian use stochastic events local disturbance facilitating the introduction of competitive weeds and alteratio
known from only 6 locations in the transition zone in the Simi Hills and Santa Monica Mountains currently known from five population units in the Santa Monica Mountains and the western Simi Hills. One unit has 4,000 individuals; one has 3 occurrences with 1,200 individuals; one unit has 7 occurrences with 28,000 individuals; one unit has 7 occurrences with 2,900 individuals; and one unit has 4 occurrences with 1,000 individuals.
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