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Saaremaa yellow rattle is a late-flowering annual hemiparasite endemic to western Saaremaa, Estonia, growing on wet calcareous fens by attaching to the roots of perennial host plants. It is a wild species of a very restricted range and is not grown as a garden plant, so care notes apply only to its natural wetland conditions.
Rhinanthus osiliensis, in English known by the common name Saaremaa yellow rattle, is a flowering plant in the genus Rhinanthus in the family Orobanchaceae. It is endemic to the Estonian island Saaremaa in the Baltic Sea. Plants growing on the Swedish island Gotland have been ascribed to R. osiliensis, too, but genetic analyses have not supported this hypothesis.
Morphological features of R. osiliensis include glandular hairs on the sepals (calyx) and relatively narrow leaves. It is a late-flowering species of Rhinanthus, flowering from the end of July onwards.
Rhinanthus osiliensis is strictly endemic to the western part of Saaremaa island, Estonia, with a highly restricted geographic range. The species is a habitat specialist that primarily inhabits calcareous spring fens, which are naturally scarce wetland habitats. It also occurs in other wetland environments such as species-rich fens and paludified meadows. The plant can temporarily colonize marginal habitats like ditch verges and stream banks, though such populations tend to be transient.
European yellow rattle · Greater yellow-rattle · Aristate Yellow Rattle · Little yellow rattle · Hay Rattle
Text excerpted from the Wikipedia article Rhinanthus osiliensis by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
