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Thelypodium Stenopetalum
''Thelypodium stenopetalum'' is a rare species of flowering plant in the mustard family known by the common names slenderpetal thelypody, slender-petaled thelypodium and slender-petaled mustard. It is endemic to the San Bernardino Mountains of southern California, where it is known from only three or four extant occurrences in moist mountain meadows near Big Bear Lake. Its remaining habitat is considered seriously threatened and the plant is a federally listed endangered species in the United States. Description ''Thelypodium stenopetalum'' is a biennial herb producing decumbent stems up to about 80 centimeters long. The branching stems are hairless, waxy in texture, and greenish to purple in color. The basal leaves have thick, oblong to lance-shaped blades up to 15 centimeters long with smooth or rippled edges. Leaves higher on the plant have much smaller blades which may clasp the stem at their bases. The inflorescence is an erect, open raceme of widely spaced flowers. The p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sereno Watson
Sereno Watson (December 1, 1826 in East Windsor Hill, Connecticut – March 9, 1892 in Cambridge, Massachusetts) was an American botanist. Graduating from Yale in 1847 in Biology, he drifted through various occupations until, in California, he joined the Clarence King Expedition and eventually became its expedition botanist. Appointed by Asa Gray as assistant in the Gray Herbarium of Harvard University in 1873, he later became its curator, a position he maintained until his death. Watson was elected a Fellow of the American Academy of Arts and Sciences in 1874, and a member of the National Academy of Sciences The National Academy of Sciences (NAS) is a United States nonprofit, non-governmental organization. NAS is part of the National Academies of Sciences, Engineering, and Medicine, along with the National Academy of Engineering (NAE) and the Nat ... in 1889. Works * ''Botany'', in ''Report of the geological exploration of the 40th parallel made ... by Clarence King ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Introduced Species
An introduced species, alien species, exotic species, adventive species, immigrant species, foreign species, non-indigenous species, or non-native species is a species living outside its native distributional range, but which has arrived there by human activity, directly or indirectly, and either deliberately or accidentally. Non-native species can have various effects on the local ecosystem. Introduced species that become established and spread beyond the place of introduction are considered naturalized. The process of human-caused introduction is distinguished from biological colonization, in which species spread to new areas through "natural" (non-human) means such as storms and rafting. The Latin expression neobiota captures the characteristic that these species are ''new'' biota to their environment in terms of established biological network (e.g. food web) relationships. Neobiota can further be divided into neozoa (also: neozoons, sing. neozoon, i.e. animals) and n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Natural History Of The Transverse Ranges
Nature, in the broadest sense, is the physical world or universe. "Nature" can refer to the phenomena of the physical world, and also to life in general. The study of nature is a large, if not the only, part of science. Although humans are part of nature, human activity is often understood as a separate category from other natural phenomena. The word ''nature'' is borrowed from the Old French ''nature'' and is derived from the Latin word ''natura'', or "essential qualities, innate disposition", and in ancient times, literally meant "birth". In ancient philosophy, ''natura'' is mostly used as the Latin translation of the Greek word ''physis'' (φύσις), which originally related to the intrinsic characteristics of plants, animals, and other features of the world to develop of their own accord. The concept of nature as a whole, the physical universe, is one of several expansions of the original notion; it began with certain core applications of the word φύσις by pre-Socr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Butterfly Food Plants
Butterflies are insects in the macrolepidopteran clade Rhopalocera from the order Lepidoptera, which also includes moths. Adult butterflies have large, often brightly coloured wings, and conspicuous, fluttering flight. The group comprises the large superfamily Papilionoidea, which contains at least one former group, the skippers (formerly the superfamily "Hesperioidea"), and the most recent analyses suggest it also contains the moth-butterflies (formerly the superfamily "Hedyloidea"). Butterfly fossils date to the Paleocene, about 56 million years ago. Butterflies have a four-stage life cycle, as like most insects they undergo complete metamorphosis. Winged adults lay eggs on the food plant on which their larvae, known as caterpillars, will feed. The caterpillars grow, sometimes very rapidly, and when fully developed, pupate in a chrysalis. When metamorphosis is complete, the pupal skin splits, the adult insect climbs out, and after its wings have expanded and dried, it fl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endemic Flora Of California
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsewhere. For example, the Cape sugarbird is found exclusively in southwestern South Africa and is therefore said to be ''endemic'' to that particular part of the world. An endemic species can be also be referred to as an ''endemism'' or in scientific literature as an ''endemite''. For example ''Cytisus aeolicus'' is an endemite of the Italian flora. ''Adzharia renschi'' was once believed to be an endemite of the Caucasus, but it was later discovered to be a non-indigenous species from South America belonging to a different genus. The extreme opposite of an endemic species is one with a cosmopolitan distribution, having a global or widespread range. A rare alternative term for a species that is endemic is "precinctive", which applies to s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thelypodium
''Thelypodium'' is a genus of flowering plants in the mustard family. There are 16 to 20 species, all native to western North America. Thelypody is a common name for plants in this genus. Species include: *'' Thelypodium brachycarpum'' - shortpod thelypody *'' Thelypodium crispum'' - crisped thelypody *'' Thelypodium eucosmum'' - world thelypody *'' Thelypodium flexuosum'' - nodding thelypody *'' Thelypodium howellii'' - Howell's thelypody *''Thelypodium integrifolium'' - entireleaved thelypody *''Thelypodium laciniatum'' - cutleaf thelypody *'' Thelypodium laxiflorum'' - droopflower thelypody *'' Thelypodium milleflorum'' - manyflower thelypody *'' Thelypodium paniculatum'' - northwestern thelypody *'' Thelypodium repandum'' - wavyleaf thelypody *'' Thelypodium rollinsii'' - Rollins' thelypody *''Thelypodium sagittatum ''Thelypodium'' is a genus of flowering plants in the mustard family. There are 16 to 20 species, all native to western North America. Thelypody is a common nam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Euchloe Hyantis
''Euchloe hyantis'', the pearly marble, pearly marblewing or California marble, is a butterfly in the family Pieridae. It is found on the West Coast of North America from southern Oregon south through California west of the Sierra Nevada crest to northern Baja California, Mexico. The habitat consists of rocky canyons, cliffs, moraines and gravelly flats. The wingspan is . Adults are on wing from April to early July in one generation per year. The larvae feed on the flowers and fruits of Brassicaceae species, especially ''Streptanthus ''Streptanthus'' is a genus of plants within the family Brassicaceae. There are about 35 known species within the genus ''Streptanthus'', distributed mostly throughout western North America. The common names for this genus are twistflower and je ...'' species. Chrysalids hibernate. Subspecies The following subspecies are recognized: *''Euchloe hyantis hyantis'' *''Euchloe hyantis andrewsi'' Martin, 1936 References Euchloe Butterflies d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pebble Plain
A pebble is a clast of rock with a particle size of based on the Udden-Wentworth scale of sedimentology. Pebbles are generally considered larger than granules ( in diameter) and smaller than cobbles ( in diameter). A rock made predominantly of pebbles is termed a conglomerate. Pebble tools are among the earliest known man-made artifacts, dating from the Palaeolithic period of human history. A beach composed chiefly of surface pebbles is commonly termed a shingle beach. This type of beach has armoring characteristics with respect to wave erosion, as well as ecological niches that provide habitat for animals and plants. Inshore banks of shingle (large quantities of pebbles) exist in some locations, such as the entrance to the River Ore, England, where the moving banks of shingle give notable navigational challenges. Pebbles come in various colors and textures and can have streaks, known as veins, of quartz or other minerals. Pebbles are mostly smooth but, dependent on how ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soil Quality
Soil quality refers to the condition of soil based on its capacity to perform ecosystem services that meet the needs of human and non-human life.Tóth, G., Stolbovoy, V. and Montanarella, 2007. Soil Quality and Sustainability Evaluation - An integrated approach to support soil-related policies of the European Union", EUR 22721 EN. 40 pp. Office for Official Publications of the European Communities, Luxembourg. . Soil quality reflects how well a soil performs the functions of maintaining biodiversity and productivity, partitioning water and solute flow, filtering and buffering, nutrient cycling, and providing support for plants and other structures. Soil management has a major impact on soil quality. Soil quality relates to soil functions. Unlike water or air, for which established standards have been set, soil quality is difficult to define or quantify. Indicators of soil quality Soil quality can be evaluated using the Soil Management Assessment Framework. Soil quality in agr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrology
Hydrology () is the scientific study of the movement, distribution, and management of water on Earth and other planets, including the water cycle, water resources, and environmental watershed sustainability. A practitioner of hydrology is called a hydrologist. Hydrologists are scientists studying earth or environmental science, civil or environmental engineering, and physical geography. Using various analytical methods and scientific techniques, they collect and analyze data to help solve water related problems such as environmental preservation, natural disasters, and water management. Hydrology subdivides into surface water hydrology, groundwater hydrology (hydrogeology), and marine hydrology. Domains of hydrology include hydrometeorology, surface hydrology, hydrogeology, drainage-basin management, and water quality, where water plays the central role. Oceanography and meteorology are not included because water is only one of many important aspects within those fields. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silique
A silique or siliqua (plural ''siliques'' or ''siliquae'') is a type of fruit (seed capsule) having two fused carpels with the length being more than three times the width. When the length is less than three times the width of the dried fruit it is referred to as a silicle. The outer walls of the ovary (the ''valves'') usually separate when ripe, then being named ''dehiscent'', and leaving a persistent partition (the ''replum''). ''Siliques'' are present in many members of the mustard family, Brassicaceae, but some species have ''silicles'' instead. Some species closely related to plants with true ''siliques'' have fruits with a similar structure that do not open when ripe; these are usually called ''indehiscent siliques'' (compare dehiscence). Lunaria annua MHNT.BOT.2004.0.779.jpg, Silicles of '' Lunaria annua'' – MHNT Capsella bursa-pastoris Sturm23.jpg, '' Capsella bursa-pastoris'' with silicles Raphanus sativus 004.jpg, Indehiscent siliques of radish '' Raphanus sativu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brassicaceae
Brassicaceae () or (the older) Cruciferae () is a medium-sized and economically important family of flowering plants commonly known as the mustards, the crucifers, or the cabbage family. Most are herbaceous plants, while some are shrubs. The leaves are simple (although are sometimes deeply incised), lack stipules, and appear alternately on stems or in rosettes. The inflorescences are terminal and lack bracts. The flowers have four free sepals, four free alternating petals, two shorter free stamens and four longer free stamens. The fruit has seeds in rows, divided by a thin wall (or septum). The family contains 372 genera and 4,060 accepted species. The largest genera are '' Draba'' (440 species), '' Erysimum'' (261 species), '' Lepidium'' (234 species), '' Cardamine'' (233 species), and '' Alyssum'' (207 species). The family contains the cruciferous vegetables, including species such as '' Brassica oleracea'' (cultivated as cabbage, kale, cauliflower, broccoli and co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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