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- H. hispanica has paler flowers produced on all sides of the upright stem, less recurved petals and blue pollen. (en)
- Bluebells in Pryor's Wood, Hertfordshire (en)
- In the west of its range, H. non-scripta lives in open habitats, here on Ulva in the Hebrides, Scotland (en)
- H. non-scripta has dark flowers in one-sided, nodding racemes, with strongly recurved petals and white pollen. (en)
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