Parnassia


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Parnassia

 

a genus of annual grasses of the family Saxifragaceae. They are often (with the genus Lepuropetalon) distinguished as the separate family Parnassiaceae. There are 55 varieties in the temperate and subtropical regions of the northern hemisphere. There are four types in the USSR; of them, the most widely distributed is the swamp whiteface (P. palustris), which grows in damp fields, brush, and swamps. This is a graceful plant 15–40 cm. high, with a rosetta of leaves near the roots and single white flowers with five petals on the ends of the stems. The other varieties are found in tundra and alpine and subalpine mountain meadows.

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The status of Parnassia (Saxifragaceae) in the West Gulf Coastal Plain.
Beitrage zur floralen Morphogenese und Histogenese der Saxifragaceae, VII: Parnassia palustris und Francoa sonchifolia.
Studies in the family Saxifragaceae, X: Floral morphology and systematic position of Parnassia.
However, there are a few plants that occur only or primarily in these calcareous fens, including Juncus brachycephalus, Parnassia glauca, Rhynchospora capillacea, Selaginella apoda, Triglochin palustre, and Zizia aurea.
It differs in that its substrate is more treacherous (usually floating), the groundwater is not under pressure, no marl is present in the sediment profiles, and extremely calcicolous species such as Parnassia glauca and Selaginella are absent.
7, 2 44, 13, 13 Parnassia glauca P -- -- Parthenocissus quinquefolia 3, 0.