Isotoma Lindl.

Corolla tube entire, notched or slit half-way to the base anteriorly Isotoma
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
Corolla tube less than 1cm. Leaves entire or toothed less than 2 cm long