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..2 Carpels 4; petals white; seeds tuberculate; [section Leucoreseda]
..2 Carpels 3; petals yellowish; seeds smooth; [section Reseda]
....3 Sepals and petals 4; seeds smooth; fruits < 7 mm long, crowded, erect to ascending; [section Luteola]
......4 Capsules 7-11 mm long; sepals (in fruit) < 5mm long
......4 Capsules (well-developed) 11-15 mm long; sepals (in fruit > 5 mm long)