Cultivar 'Ron Williams' (a garden hybrid of cultivars 'Columnaris' and 'Asplenifolia'), also sold as Fine Line®
(photographed in 2024). "The cultivar 'Asplenifolia' (Frangula alnus var. asplenifolia Dippel; fernleaf or cutleaf buckthorn) has linear-oblong leaves with coarsely toothed to incised margins and commonly is grown as a specialty plant. The cultivar 'Columnaris' (tallhedge glossy buckthorn) has a narrow, upright habit and is used in hedging."--Flora of North America. Photo 1 of 2