Environmental control of flowering and morphology in the high‐arctic Cerastium regelii, and the taxonomic status of C. jenisejense

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Abstract
Cerastium regelii has a distribution confined largely to regions north of 70° N but has retained a strong short‐day (SD) response for primary flower induction despite the fact that it will hardly ever experience SD in a non‐frozen condition in its natural environment. However, like many other high‐latitude short‐long‐day plants it has also an alterntive long day (LD) pathway for floral initiation at low temperatures (C. regelii develops a striking resemblance to the sub‐arctic C. jenisejense . Based on examination of authentic herbarium material it is concluded that the latter is merely a high‐temperature morphotype of C. regelii .