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Key to Scrophularia
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40435
1 Staminode (hidden under the upper corolla lip) yellowish-green (often drying darker), usually wider than long and the tip fan-shaped; leaf serrations coarse, often > 3 mm long; flowering May-early Jul; capsule 6-10 mm long, tapered at the tip, the surface dull at maturity | |