Flowering plant magnoliid (2%) clades. The remaining 5 clades contain a little over 250 species in total; i.e. less than 0.1% of flowering plant diversity, divided among 9 families. The 43 most-diverse of 443 families of flowering plants by species, in their APG circumscriptions, are Of these, the Orchidaceae, Poaceae, Cyperaceae, Araceae, Bromeliaceae, Arecaceae, and Iridaceae are monocot families; Piperaceae, Lauraceae, and Annonaceae are magnoliid dicots; the rest of the families are eudicots. Double fertilization refers to a process in which two sperm cells fertilize cells in the ovule. This process begins when a pollen grain adheres to the stigma of the
Narcissus (plant) that are mainly synanthous (leaves and flowers appearing at the same time). While most species flower in late winter to spring, five species are autumn flowering ("N. broussonetii", "N. cavanillesii", "N. elegans", "N. serotinus", "N. viridiflorus"). By contrast these species are hysteranthous (leaves appear after flowering). Flower longevity varies by species and conditions, ranging from 5–20 days. After flowering leaf and root senescence sets in, and the plant appears to be 'dormant' till the next spring, conserving moisture. However the dormant period is also one of considerable activity within the bulb primordia. It is also a period during which the