Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.
1 Nutlets 3.5-5 mm long; calyx lobes 1.5-3 mm long (from the pedicel insertion point to the apices of the lobes); corolla 2.5-6.3 (-7.6) mm wide; some stem leaves petiolate
1 Nutlets 5-8.7 mm long, calyx lobes 2-5 mm, slightly accrescent up to 6.2 mm in fruit; corolla 6-12 (-16) mm wide; all stem leaves clasping or sessile