bright yellow greater celandine flower.

aggressive alcoholic alkaloids allocryptopine aqueous background berberine bokeh botanical botany bright buttercup celandine chelerythrine chelidonine chelidonium chinese close closeup coptisine dark detial europe european extractions flower flowers focus greater gree green growth herb herbaceous herbal herbalism hot invasive isoquinoline leaf leaves majus medicinal medicine nature nipplewort norchelidonine perennial petal petals plant poison poisonous protopine sanguinarine selective spring springtime stylopine swallowwort tea tetterwort toxic traditional ukrain wildflower wildflowers yellow