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No vegetative reproduction. Flowers regularly and regularly produces numerous mature nutlets, germinating to about 70 % (Alsos et al. in prep.)
The two smallest species of Ranunculus in Svalbard – R. hyperboreus and R. pygmaeus – are often confused. They are easily distinguished by R. hyperboreus having three sepals and petals and a prostrate growth form with rooting shoots, whereas R. pygmaeus has five sepals and petals and grows as solitary plants with no rooting shoots. They also differ ecologically; R. hyperboreus is the perhaps only true aquatic vascular plant in Spitsbergen, whereas R. pygmaeus is confined to dry to occasionally moist ground.
Tall-grown plants of R. pygmaeus may be confused with small plants of R. nivalis, but the former has smaller flowers (0.5–0.8 vs. 1.5–2.2 cm wide), white willose hairs on sepals, and smaller heads (4–6 × 4–5 vs. 5–20 × 5–8 mm) with much smaller nutlets.
Snowbeds, base of soil slopes, snow protected meadows, and depressions in heaths, base of bird cliff meadows. Mainly on well-drained and often coarse substrates (coarse sand to stones), but often moist or close to brooks. Indifferent as to soil reaction (pH) or perhaps slightly preferring circumneutral to acidic soils.
Alsos, I.G., Müller, E. & Eidesen, P.B. In prep. Germinability of 87 arctic species stored in Svalbard Global Seed Vault.
Frøplante: Frø av denne arten er lagret i Svalbard globale frøhvelv, og deres spireevne vil bli sjekket med jevne mellomrom. (Alsos et al. In prep).
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|Source: Brochmann, C. & Steen, S.W, 1999 - Sex and genes in the flora of Svalbard|