Isotoma Lindl.

Corolla tube entire, notched or slit half-way to the base anteriorly Isotoma

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Corolla pale blue; the tube 2–3 cm long. Leaves deeply pinnate-lobed, narrow-oblong to narrow-elliptic in outline, 4–6.5 cm long. Capsule ellipsoid, c. 8 mm diam., on peduncles up to 13 cm long. Acrid, tufted herbs up to 50 cm high. Widespread. Stony sites. Fl. spring–autumn Isotoma axillaris

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Corolla tube less than 1cm. Leaves entire or toothed less than 2 cm long