About 70% of angiosperm species have endosperm cells that are polyploid. It can be useful for flower identification or comparison between angiosperm taxa. Apomixis (reproduction via asexually formed seeds) is found naturally in about 2.2% of angiosperm genera. During the Cretaceous, a radiation of angiosperm plants and their insect pollinators occurred. Polypores are often restricted to either deciduous (angiosperm) or conifer (gymnosperm) host trees. Monoecy is especially common in conifers, but occurs in only about 7% of angiosperm species. Morina is a genus of the angiosperm family Caprifoliaceae. Lycopods, ferns, and angiosperm shrubs may have been important components of the Paleocene understory. The region provides shelter to various thallophyte, bryophyte, pteridophyte, gymnosperm, and angiosperm species. It is found in both gymnosperm and angiosperm plants. The term is opposed to hardwood, which is the wood from angiosperm trees. Phylogeny based on the Angiosperm Phylogeny Website. Taxonomy based on the Angiosperm Phylogeny Website. This section lists the orders of Viridiplantae within the division Angiosperm. This follows the work of the Angiosperm Phylogeny Group.