Krameria tomentosa oil flowers and their pollinators: bees specialized on trichome elaiophores exploit its epithelial oil glands - Carneiro, Liedson Tavares; Aguiar, Antônio José Camillo; Martins, Celso Feitosa; Machado, Isabel Cristina; Alves-dos-Santos, Isabel (Flora: morphology, distribution, functional ecology of plants, 2015)