yellow flower with green background, coreopsis lanceolata

america arboretum asteraceae asterales auriculata bloom blossom botanical botanist botany camomile chamomile color coreopsis crassifolia daisy europe european flora floral florist flower flowers gallen garden gladiata heterogyna horticulture july lance lanceleaf lanceolata leaf leaved natural nature nobody north oblongifolia petals plants pubescens rosea sand summer switzerland tickseed yellow