Unfortunately both Plantnet and Vicflora use the attachment of stem hairs, not leaf hairs, to differentiate Swainsona serices and Swainsona behriana (attached part way along the hairs for Swainsona sericea; attached at the end or nearly at the end for Swainsona behriana. I don't think even a macro will show that if the hairs are close to the stem.