Two voucher samples per species per plot should be made. Ideally, the voucher specimens collected for herbarium mounting should be from the same individual and in flower or fruit; however sterile specimens are acceptable. DNA barcode sequences of unvouchered samples will be compared to the DNA barcode sequence of the vouchered specimen to confirm identity. One voucher sample should be deposited in the host country with a duplicate sent to the US National Herbarium at the Smithsonian Institution where it will be mounted and accessioned into the herbarium collections.