Perennial forb to 80cm tall. Leaves opposite each other near the base, alternating up the stems higher up. Leaves 0.4-6cm long, 1-4mm wide, linear, hairless to sparsely hairy, margins flat, entire or with small teeth, and with pointed tips. Flowers blue, sometimes pink or white inside, white to yellowish brown outside, bell-shaped, with 5 or sometimes 6 lobes, in open groups at the tops of the stems.
The main flower colour is blue.
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