Fig. 2.

Comparison of sequence recovery for three DNA barcodes among 25 species-rich families using a beta regression model and reference families (Fabaceae for rbcL and matK, Brassicaceae for ITS2). Test 1: Herbarium specimens in seven different age classes (decade 1: 1–10 yr; decade 2: 11–20 yr; decade 3: 21–30 yr; decade 4: 31–40 yr; decade 5: 41–50 yr; decade 6: 51–60 yr; decade 7 and older: 61 yr and older). Test 2: Silica gel–preserved material vs. herbarium specimens from decade 1. NA = not applicable.