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flower lily orange green leaves stems petals pollen pistil stamen ovary sepals bracts inflorescence scape pedicel bracteole flower bud open flower closed flower wilted flower dead flower pollination fertilization seed dispersal germination growth flowering fruiting senescence death decomposition nutrient cycling energy flow ecosystem habitat niche population community food chain food web trophic level predator prey parasite host symbiosis mutualism commensalism amenalism competition predation herbivory parasitism disease infection pathogen vector resistance immunity adaptation evolution natural selection artificial selection domestication hybridization cultivation horticulture floriculture landscape architecture gardening flower arranging floral design botanical art botanical illustration botanical photography botanical science botany plant biology plant anatomy plant morphology plant physiology plant ecology plant evolution plant genetics plant breeding plant pathology plant conservation plant diversity plant resources plant utilization plant products plant medicines plant foods plant fibers plant dyes plant oils plant waxes plant resins plant gums plant mucilages plant pectins plant starches plant sugars plant proteins plant vitamins plant minerals plant secondary metabolites plant toxins plant allergens plant carcinogens plant teratogens plant mutagens