|
Urtica Lalibertadensis
''Urtica lalibertadensis'' is a species of the genus Urtica. It differs from '' U. leptostachya'' in its subscandent habit and the deflexed stinging hairs on the glabrous stem, and by the presence of numerous stinging hairs on the perigon of the female flowers (and fruits) and individual stinging hairs on the perigon of the male flower. It is a very abundant species in Peru. Description It is a lianescent subshrub or erect perennial herb around tall. Its rhizome is around thick; its stems are erect, with numerous deflexed stinging hairs, approximately long. Its leaves are opposite, interpetiolar stipules united in pairs but deeply incised, about long and wide, without conspicuous cystoliths and with scattered, white simple trichomes along the margins. Petioles are long, abaxial surface with scattered pubescence on the veins and with scattered stinging hairs. Its inflorescences are androgynous, the lowest ones often pure male, upper one often pure female. Distribution La ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urtica Leptostachya
''Urtica'' is a genus of flowering plants in the family Urticaceae. Many species have stinging hairs and may be called nettles or stinging nettles, although the latter name applies particularly to ''Urtica dioica''. ''Urtica'' species are food for the caterpillars of numerous Lepidoptera (butterflies and moths), such as the tortrix moth ''Syricoris lacunana'' and several Nymphalidae, such as ''Vanessa atalanta'', one of the red admiral butterflies. The generic name ''Urtica'' derives from the Latin for sting. Description ''Urtica'' species grow as annuals or perennial herbaceous plants, rarely shrubs. They can reach, depending on the type, location and nutrient status, a height of . The perennial species have underground rhizomes. The green parts have stinging hairs. Their often quadrangular stems are unbranched or branched, erect, ascending or spreading. Most leaves and stalks are arranged across opposite sides of the stem. The leaf blades are elliptic, lanceolate, ovate or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trichome
Trichomes (); ) are fine outgrowths or appendages on plants, algae, lichens, and certain protists. They are of diverse structure and function. Examples are hairs, glandular hairs, scales, and papillae. A covering of any kind of hair on a plant is an indumentum, and the surface bearing them is said to be pubescent. Algal trichomes Certain, usually filamentous, algae have the terminal cell produced into an elongate hair-like structure called a trichome. The same term is applied to such structures in some cyanobacteria, such as '' Spirulina'' and ''Oscillatoria''. The trichomes of cyanobacteria may be unsheathed, as in ''Oscillatoria'', or sheathed, as in ''Calothrix''. These structures play an important role in preventing soil erosion, particularly in cold desert climates. The filamentous sheaths form a persistent sticky network that helps maintain soil structure. Plant trichomes Plant trichomes have many different features that vary between both species of plants an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urtica Urentivelutina
''Urtica urentivelutina'' is a species of the genus ''Urtica''. This species is closely related to '' U. macbridei'', but differs in its much denser and longer indument, especially on the stipules ( subglabrous in ''U. macbridei'') and the presence of stinging hairs on the perigon of the female flowers. The leaves are densely pubescent and also irregularly bullate between the veins, which is a character not found in other Peruvian species. Description Its liana is tall from a ligneous rhizome approximately thick. Its stems are lax, with scattered stinging hairs between long and with a dense, white cover of simple trichomes long. Leaves are opposite, with interpetiolar stipules united in pairs but deeply incised, and completely covered with white simple trichomes appromately in length. Petioles are long, and its cystoliths are largely punctiform. Inflorescences are unisexual, while its fruit is ovate, approximately x , with a very short apex, largely included in the pube ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ancash Region
Ancash ( qu, Anqash; es, Áncash ) is a department and region in northern Peru. It is bordered by the departments of La Libertad on the north, Huánuco and Pasco on the east, Lima on the south, and the Pacific Ocean on the west. Its capital is the city of Huaraz, and its largest city and port is Chimbote. The name of the region originates from the Quechua word ('light, of little weight'), from ('blue') or from ('eagle'). Geography Ancash is a land of contrasts: it features two great longitudinal valleys, which combine the mountain characteristics of the Callejón de Huaylas (Alley of Huaylas) with the sylvan ones of the Alto Marañón. Kilometres of sandy beaches and the blue waters of the Pacific. The territory of the coast, high plateaux and Andean '' punas'' of the department are flat, while the rest of the territory, in the Andes, is very rough. In the west, there are slopes with strong declivity form narrow canyons with abrupt and deserted sides. The rough territor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
La Libertad Region
La Libertad (; in English: ''The Liberty'') is a region in northwestern Peru. Formerly it was known as the Department of La Libertad ('). It is bordered by the Lambayeque, Cajamarca and Amazonas regions on the north, the San Martín Region on the east, the Ancash and Huánuco regions on the south and the Pacific Ocean on the west. Its capital is Trujillo, which is the nation's third biggest city. The region's main port is Salaverry, one of Peru's largest ports. The name of the region is Spanish for "freedom" or "liberty"; it was named in honor of the Intendencia of Trujillo's proclaiming independence from Spain in 1820 and fighting for that. It is the ninth smallest department in Peru, but it is also its second most populous department after Piura and its second most densely populated department after Lambayeque. Name During the viceroyalty of Peru, the La Libertad region, together with the present-day regions of Lambayeque, Piura and Tumbes regions in Peru, and Guayaquil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Androgynous
Androgyny is the possession of both masculine and feminine characteristics. Androgyny may be expressed with regard to biological sex, gender identity, or gender expression. When ''androgyny'' refers to mixed biological sex characteristics in humans, it often refers to intersex people, who are born with congenital variations that complicate assigning their sex at birth. In comparison, hermaphroditism is the possession of both male and female reproductive organs. Regarding gender identity, androgynous individuals may identify with non-binary identities. Others may identify as transgender. As a form of gender expression, androgyny has fluctuated in popularity in different cultures and throughout history. Physically, an androgynous appearance may be achieved through personal grooming, fashion, or hormone treatment. Etymology The term derives from grc, ἀνδρόγυνος, from , stem - (''anér, andro-'', meaning man) and (''gunē, gyné'', meaning woman) through the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inflorescence
An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Morphologically, it is the modified part of the shoot of seed plants where flowers are formed on the axis of a plant. The modifications can involve the length and the nature of the internodes and the phyllotaxis, as well as variations in the proportions, compressions, swellings, adnations, connations and reduction of main and secondary axes. One can also define an inflorescence as the reproductive portion of a plant that bears a cluster of flowers in a specific pattern. The stem holding the whole inflorescence is called a peduncle. The major axis (incorrectly referred to as the main stem) above the peduncle bearing the flowers or secondary branches is called the rachis. The stalk of each flower in the inflorescence is called a pedicel. A flower that is not part of an inflorescence is called a solitary flower and its stalk is al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pubescence
Puberty is the process of physical changes through which a child's body matures into an adult body capable of sexual reproduction. It is initiated by hormonal signals from the brain to the gonads: the ovaries in a girl, the testes in a boy. In response to the signals, the gonads produce hormones that stimulate libido and the growth, function, and transformation of the brain, bones, muscle, blood, skin, hair, breasts, and sex organs. Physical growth—height and weight—accelerates in the first half of puberty and is completed when an adult body has been developed. Before puberty, the external sex organs, known as primary sexual characteristics, are sex characteristics that distinguish boys and girls. Puberty leads to sexual dimorphism through the development of the secondary sex characteristics, which further distinguish the sexes. On average, girls begin puberty at ages 10–11 and complete puberty at ages 15–17; boys generally begin puberty at ages 11–12 and complete p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petiole (botany)
In botany, the petiole () is the stalk that attaches the leaf blade to the stem, and is able to twist the leaf to face the sun. This gives a characteristic foliage arrangement to the plant. Outgrowths appearing on each side of the petiole in some species are called stipules. Leaves with a petiole are said to be petiolate, while leaves lacking a petiole are called sessile or apetiolate. Description The petiole is a stalk that attaches a leaf to the plant stem. In petiolate leaves, the leaf stalk may be long, as in the leaves of celery and rhubarb, or short. When completely absent, the blade attaches directly to the stem and is said to be sessile. Subpetiolate leaves have an extremely short petiole, and may appear sessile. The broomrape family Orobanchaceae is an example of a family in which the leaves are always sessile. In some other plant groups, such as the speedwell genus '' Veronica'', petiolate and sessile leaves may occur in different species. In the grasses (Poaceae), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cystolith
Cystolith (Gr. "cavity" and "stone") is a botanical term for outgrowths of the epidermal cell wall, usually of calcium carbonate, formed in a cellulose matrix in special cells called lithocysts, generally in the leaf of plants. Cystoliths are present in certain families, including in many genera of Acanthaceae. Plants in the family Urticaceae, known as stinging nettles, also form leaf cystoliths, but only during their later flowering and seed setting stages. Other examples include Cannabis and other plants in the family Cannabaceae, which produce leaf and flower cystoliths, and ''Ficus elastica'', the Indian rubber plant of the family Moraceae The Moraceae — often called the mulberry family or fig family — are a family of flowering plants comprising about 38 genera and over 1100 species. Most are widespread in tropical and subtropical regions, less so in temperate climates; however .... From a 1987 article on cystolith development and structure: References Cell ana ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Habit (biology)
Habit, equivalent to habitus in some applications in biology, refers variously to aspects of behaviour or structure, as follows: *In zoology (particularly in ethology), habit usually refers to aspects of more or less predictable ''behaviour'', instinctive or otherwise, though it also has broader application. Habitus refers to the characteristic form or morphology of a species. *In botany, habit is the characteristic form in which a given species of plant grows (see plant habit).Jackson, Benjamin, Daydon; A Glossary of Botanic Terms with their Derivation and Accent; Published by Gerald Duckworth & Co. London, 4th ed 1928 Behavior In zoology, ''habit'' (not to be confused with ''habitus'' as described below) usually refers to a specific behavior pattern, either adopted, learned, pathological, innate, or directly related to physiology. For example: * ...the atwas in the ''habit'' of springing upon the oor knockerin order to gain admission... * If these sensitive parrots are kep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stipule
In botany, a stipule is an outgrowth typically borne on both sides (sometimes on just one side) of the base of a leafstalk (the petiole). Stipules are considered part of the anatomy of the leaf of a typical flowering plant, although in many species they may be inconspicuous —or sometimes entirely absent, and the leaf is then termed ''exstipulate''. (In some older botanical writing, the term "stipule" was used more generally to refer to any small leaves or leaf-parts, notably prophylls.) The word ''stipule'' was coined by Linnaeus''Concise English Dictionary'' Wordsworth Editions Ltd. 1994, from Latin ''stipula'', straw, stalk. Types of stipules General characteristics The position of stipules on a plant varies widely from species to species, though they are often located near the base of a leaf. Stipules are most common on dicotyledons, where they appear in pairs alongside each leaf. Some monocotyledon plants display stipule-like structures, but only display one per leaf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
