`wild violet` flower - monopsis unidentata

acrodon alba america american arboretum asterales august belliflora bloom blossom blue botanical botanist botany campanulaceae debilis decipiens europe european flava flora florist flowers gallen garden horticulture kowynensis leaf lobelia lobelioideae lutea malvacea monopsis natural nature petals plants purple saint scabra simplex south stellarioides summer swiss switzerland unidentata variifolia violet wild zeyheri