Abstract
Phenological Predictability Index (PPI) is a tool for analysing phenological patterns incorporating herbarium data within BRAHMS (Botanical Research and Herbarium Management System). PPI produces a maximum‐activity period and associated event predictability index between ∼0 and 1. Simple, monthly random sampling showed the ideal number of unique records (event/month/year) is > 50. PPI correctly predicted the maximum‐activity flowering month for seven out of eight species studied in the field, and was positively correlated (R2= 0.610, p = 0.02) with phenophase length, even using suboptimum numbers of unique records.
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