How many herbarium specimens are needed to detect threatened species

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Using species distribution models to inform IUCN Red List assessments (2014, background): “Many threatened plant species are known from only a few localities (< 15), and their Red List assessments are often based on a small number of collections (Rivers et al. 2011).”
The Effects of Sampling Bias and Model Complexity on the Predictive Performance of MaxEnt Species Distribution Models (2013, background): “These simpler models have the added benefit of being easier to interpret and thereby aid the understanding of a species’ ecology, which may be particularly valuable in the case of the many potentially threatened plant species for which ecological information is lacking [59,60].”
Assessing the Relevance of Herbarium Collections as Tools for Conservation Biology (2017, background): “…of occurrence (EOO) and the area of occupation (AOO) of a given taxon, necessary to define its degree of threat, various articles point to the importance of using herbarium materials (e.g., Hernández & Navarro, 2007; Rivers et al., 2010, 2011; Miller et al., 2012, 2013; Roberts et al., 2016).”
Innovative approaches to the preservation of forest trees (2014, unknown): “In a study on 661 endemic species of legumes and orchids from Madagascar, it was concluded that capturing 15 geo-referenced specimens per species was sufﬁcient to produce robust preliminary conservation assessments based on range estimates (Rivers et al., 2011).”