Appearance
The plant is perennial with fibrous roots. Its leaves are arranged into a rosette while its petiole is hairy and is 3.5–12 centimetres long. It has an ovate blade that is also hairy, cordate at the base, and both crenate and rounded at the apex. The species has 10–25 centimetres tall scapes with an inflorescence which has an umbel of 5-15 flowers. The sepals form a bell-shaped calyx 0.7 centimetres long, with spreading, lanceolate lobes. Depending on region and habitat, it flowers from April to June. "Primula sieboldii" is a heterostylous clonal herb and is pollinated by a variety of insects. Pollinators include butterflies, syrphids, and bumblebees such as "Bombus diversus".Distribution
"Primula sieboldii" is an ornamental plant which grows in wet areas and forests in China, Japan, Korea, and Russia.Status
The species was once common in moist habitats among the volcanic soils of Japan but has declined in recent years and was put on the Japanese national red list in 2000. In 2007 it was reclassified as near threatened thanks to success in conservation effects. However 19 prefectures in Japan consider "Primula sieboldii" as a threatened species; it has been extirpated in four prefectures as of 2017. Most populations of the species in Japan are now isolated as a consequence of habitat fragmentation, with different populations facing different conditions, genetic diversity, and risk of localized extinction.References:
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