grass of Parnassus 
noun
A herbaceous plant of north temperate regions, which bears a solitary white flower.
- Genus Parnassia, family Saxifragaceae: several species, in particular P. palustris.
- Both Old Fen and Middle Fen are dominated by a mix of saw sedge and black bog rush, with shows of grass of Parnassus in the calcium-rich spring flushes.
- A single stem leaf, located near the midpoint of the flowering stem, makes grass of Parnassus easy to identify.
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