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Article from Bean's Trees and Shrubs Hardy in the British Isles
Recommended citation
'Lithospermum' from the website Trees and Shrubs Online (treesandshrubsonline.
A genus of about fifty species of herbs and sub-shrubs, with a few shrubs. Leaves alternate, entire; calyx five-parted; corolla funnel-shaped or salver-shaped spreading at the mouth into five lobes. The generic name refers to the hard, stone-like seeds. The genus is found in the temperate parts of both hemispheres.