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Aspidostemon
''Aspidostemon'' is a genus of flowering plants belonging to the family Lauraceae. It occurs in Madagascar. Taxonomy The genus was described by Jens Gunter Rohwer & Hans Georg Richter in ''Jahrbuch für Botanische Systematik, Pflanzengeschichte und Pflanzengeographie'' 109 (1): 74 in 1987. The type species is '' Aspidostemon perrieri'' ( Danguy) Rohwer. The number of collections available is not large. The identification was done at the Missouri Botanical Garden. Description They are shrubs or trees up to 25 m high, hermaphrodites. The leaves are entire, elliptical or narrowly elliptical. The fruit is a berry-like drupe dispersed mostly by birds. ''Aspidostemon'' species are no exception among the Lauraceae; they are trees with small flowers, hard to detect and collect and often overlooked or ignored when plants easier to collect or with showier flowers are at hand. ''Aspidostemon'' is characterized by its opposite leaves, flowers with three or six stamens (compared to 9 in ''C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lauraceae
Lauraceae, or the laurels, is a plant Family (biology), family that includes the bay laurel, true laurel and its closest relatives. This family comprises about 2850 known species in about 45 genus (biology), genera worldwide. They are dicotyledons, and occur mainly in warm temperate and tropical regions, especially Southeast Asia and South America. Many are aromatic evergreen trees or shrubs, but some, such as ''Sassafras'', are deciduous, or include both deciduous and evergreen trees and shrubs, especially in tropical and temperate climates. The genus ''Cassytha'' is unique in the Lauraceae in that its members are parasite, parasitic vines. Most laurels are highly poisonous. Overview The family has a worldwide distribution in tropical and warm climates. The Lauraceae are important components of tropical forests ranging from low-lying to Montane forest, montane. In several forested regions, Lauraceae are among the top five families in terms of the number of species present. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryptocarya
''Cryptocarya'' is a genus of about 360 species of flowering plants in the laurel family, Lauraceae. Most species are trees, occasionally shrubs, distributed through the Neotropical, Afrotropical, Indomalayan, and Australasian realms. Most plants in the genus ''Cryptocarya'' have leaves arranged alternately along the stems, small flowers with 6 tepals, stamens in 2 rows, the inner row alternating with staminodes, and the fruit is a drupe. Description Plants in the genus ''Cryptocarya'' are trees, occasionally shrubs, the leaves usually arranged alternately along the branches. The leaves are petiolate and pinnately-veined. The flowers are arranged in cymes, racemes or panicles in leaf axils usually at the ends of branches and often appearing as if on the ends of the branches. The flowers have both male and female parts, with 6 tepals usually erect as the flower opens, and 9 stamens in 2 rows, the inner row of 3 alternating with staminodes. The ovary is sessile, usually with an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mammal
A mammal () is a vertebrate animal of the Class (biology), class Mammalia (). Mammals are characterised by the presence of milk-producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair, and three Evolution of mammalian auditory ossicles, middle ear bones. These characteristics distinguish them from reptiles and birds, from which their ancestors Genetic divergence, diverged in the Carboniferous Period over 300 million years ago. Around 6,640 Neontology#Extant taxon, extant species of mammals have been described and divided into 27 Order (biology), orders. The study of mammals is called mammalogy. The largest orders of mammals, by number of species, are the rodents, bats, and eulipotyphlans (including hedgehogs, Mole (animal), moles and shrews). The next three are the primates (including humans, monkeys and lemurs), the Artiodactyl, even-toed ungulates (including pigs, camels, and whales), and the Carnivora (including Felidae, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seed Dispersal
In spermatophyte plants, seed dispersal is the movement, spread or transport of seeds away from the parent plant. Plants have limited mobility and rely upon a variety of dispersal vectors to transport their seeds, including both abiotic vectors, such as the wind, and living (Biotic component, biotic) vectors such as birds. Seeds can be dispersed away from the parent plant individually or collectively, as well as dispersed in both space and time. The patterns of seed dispersal are determined in large part by the dispersal mechanism and this has important implications for the demographic and genetic structure of plant populations, as well as wikt:migration, migration patterns and species interactions. There are five main modes of seed dispersal: Gravitation, gravity, wind, ballistic, water, and by animals. Some plants are serotinous and only disperse their seeds in response to an environmental stimulus. These modes are typically inferred based on adaptations, such as wings or fle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gondwanian
Gondwana ( ; ) was a large landmass, sometimes referred to as a supercontinent. The remnants of Gondwana make up around two-thirds of today's continental area, including South America, Africa, Antarctica, Australia, Zealandia, Arabia, and the Indian subcontinent. Gondwana was formed by the accretion of several cratons (large stable blocks of the Earth's crust), beginning with the East African Orogeny, the collision of India and Madagascar with East Africa, and culminating in with the overlapping Brasiliano and Kuunga orogenies, the collision of South America with Africa, and the addition of Australia and Antarctica, respectively. Eventually, Gondwana became the largest piece of continental crust of the Paleozoic Era, covering an area of some , about one-fifth of the Earth's surface. It fused with Laurasia during the Carboniferous to form Pangaea. It began to separate from northern Pangea (Laurasia) during the Triassic, and started to fragment during the Early ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
