
1) Bog plant 2) Marsh plant 3) Swamp plant
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https://www.crosswordclues.com/clue/parnassia

The genus Parnassia, also known as Grass of Parnassus or bog-stars, are plants in the family Celastraceae. The plants occur in arctic and alpine habitats, as well as in dune systems and fens, swamps, wet meadows, open seepage areas, moist woods, and across the Northern Hemisphere. It is actually not a grass, but an herbaceous dicot. The stalk of t...
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http://en.wikipedia.org/wiki/Parnassia

• (n.) A genus of herbs growing in wet places, and having white flowers; grass of Parnassus.
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http://thinkexist.com/dictionary/meaning/parnassia/

genus of North American perennial herbs more commonly known as grass of Parnassus (q.v.).
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http://www.britannica.com/eb/a-z/p/21
Par·nas'si·a noun [ New Latin ]
(Botany) A genus of herbs growing in wet places, and having white flowers; grass of Parnassus.
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http://www.encyclo.co.uk/webster/P/25

Parnassia is a cultivated variety of potato.
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http://www.probertencyclopaedia.com/browse/QP.HTM

[
n] - any of various usually evergreen bog plants of the genus Parnassia having broad smooth basal leaves and a single pale flower resembling a buttercup
Found on
http://www.webdictionary.co.uk/definition.php?query=parnassia
grass-of-Parnassus noun any of various usually evergreen bog plants of the genus Parnassia having broad smooth basal leaves and a single pale flower resembling a buttercup
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.