2025年1月8日 · Fern, class of several thousand species of nonflowering vascular plants that reproduce by spores. Ferns have true roots, stems, and complex leaves and constitute an ancient division of plants. Learn about their physical characteristics, life cycle, genetics, evolutionary history, and classification.

Tree fern, any of a group of relatively primitive ferns in the order Cyatheales, most of them characterized by ascending trunklike stems and an arborescent (treelike) habit. Tree ferns are conspicuous plants of humid tropical forests around the world.

bracken, (Pteridium aquilinum), widely distributed fern (family Dennstaedtiaceae), found throughout the world in temperate and tropical regions. The fronds are used as thatching for houses and as fodder and are cooked as vegetables or in soups in some parts of Asia.

Agave, genus of the some 200 species of the family Asparagaceae, native to arid and semiarid regions of the Americas, particularly Mexico, and the Caribbean. They are characterized by a rosette of succulent or leathery leaves that range in size from a few centimeters to more than 2.5 meters (8 feet) in length.

Mosquito fern, genus of six or seven species of aquatic ferns, distributed nearly worldwide. Mosquito ferns can sometimes thoroughly cover ponds or other bodies of fresh water. They harbor a nitrogen-fixing cyanobacterium that is useful as …

2025年1月8日 · Fern - Spore Dispersal, Photosynthesis, Moisture: Ecologically, ferns are most commonly plants of shaded damp forests in both temperate and tropical zones. They may show structural adaptations to rocky habitats or to living as epiphytes.

2025年1月25日 · Varieties of common coleus, or painted nettle (Plectranthus scutellarioides, formerly Coleus blumei), from Java, are well-known house and garden plants up to one metre (three feet) tall.They have square stems and small, blue, two-lipped flowers borne in spikes. The leaves are often variegated with colourful patterns of magenta and green, though other colour …

Ferns (division Pteridophyta) are an ancient group of nonflowering vascular plants. They have true roots, stems, and complex leaves and reproduce by spores. Ferns can be found nearly worldwide and more than 9,000 extant species are known to science. The …

During summer, mountain beavers eat most species of ferns along with leaves of shrubs and deciduous trees, then shift to bark and seedlings of conifers and deciduous trees. Also eaten are bracken fern, devil’s club, stinging nettle, and rhododendron, which are toxic or unpalatable to other animals. Occasionally mountain beavers climb trees ...

2025年1月14日 · Ginkgo, deciduous gymnosperm tree (family Ginkgoaceae), native to China. Ginkgo has been planted since ancient times in Chinese and Japanese temple gardens and is valued as an ornamental tree in many places. Although widely cultivated, it is listed as an endangered species in its native habitat.