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Thorn (botany)
In plant morphology, thorns, spines, and prickles, and in general spinose structures (sometimes called ''spinose teeth'' or ''spinose apical processes''), are hard, rigid extensions or modifications of leaves, roots, stems or buds with sharp, stiff ends, and generally serve the same function: physically deterring animals from eating the plant material. Description In common language the terms are used more or less interchangeably, but in botanical terms, thorns are derived shoots (so that they may or may not be branched, they may or may not have leaves, and they may or may not arise from a bud),Simpson, M. G. 2010. "Plant Morphology". In: ''Plant Systematics, 2nd. edition''. Elsevier Academic Press. Chapter 9.Judd, Campbell, Kellogg, Stevens, Donoghue. 2007. "Structural and Biochemical Characters". In: ''Plant Systematics, a phylogenetic approach, third edition''. Chapter 4. spines are derived from leaves (either the entire leaf or some part of the leaf that has vascular bun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thorns On A Blackberry Branch In Norrkila
Thorn(s) or The Thorn(s) may refer to: Botany * Thorns, spines, and prickles, sharp structures on plants * '' Crataegus monogyna'', or common hawthorn, a plant species Comics and literature * Rose and Thorn, the two personalities of two DC Comics characters * Thorn (Marvel Comics), a fictional character from Marvel Comics * Thornn, a fictional character from Marvel Comics * Thorn (''Inheritance''), a dragon from the ''Inheritance cycle'' * ''Thorns'' (novel), a 1967 science fiction novel by Robert Silverberg * ''Thorn'', a 1982–1986 comic strip by Jeff Smith * Thorn Harvestar, a main character in Jeff Smith's ''Bone'' series * "The Thorn", a poem by William Wordsworth in ''Lyrical Ballads'', 1798 Companies, organisations and teams * Thorn (organization), an anti-human-trafficking organization * Thorn Electrical Industries, an electrical engineering business * Thorn EMI, a major British company involved in consumer electronics, music, defence and retail * Thorn Lightin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glochid
Glochids or glochidia (singular "glochidium") are hair-like spines or short prickles, generally barbed, found on the areoles of cacti in the sub-family ''Opuntioideae''. Cactus glochids easily detach from the plant and lodge in the skin, causing irritation upon contact. The tufts of glochids in the areoles nearly cover the stem surfaces of some cactus species, each tuft containing hundreds of glochids; this may be in addition to, or instead of, the larger, more conspicuous cactus spines, which do not readily detach and are not generally barbed. Mechanical irritant dermatitis Reaction to the glochidia Most cacti possess spines, some large enough to cause serious wounds. Glochids however, though smaller, commonly induce more troublesome, more persistent, dermatological manifestations in humans. Though minute, glochids commonly are barbed and once they have penetrated the skin barbed glochids are practically impossible to dislodge without leaving scraps of foreign material i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carissa Bispinosa
''Carissa'' is a genus of shrubs or small trees native to tropical and subtropical regions of Africa, Australia and Asia. Until recently about 100 species were listed, but most of them have been relegated to the status of synonyms or assigned to other genera, such as '' Acokanthera''. Description Different species of ''Carissa'' grow as shrubs or trees, attaining respective heights of 2 to 10 m tall. They bear smooth, sharp thorns that often are formidable; they are true botanical thorns, being modified branches, morphologically speaking. The thorns may be simple, as in ''Carissa spinarum'', dichotomously forked as in '' Carissa bispinosa'', or dichotomously branched as in ''Carissa macrocarpa''. The leaves are a rich, glossy, waxy green, smooth, simple, entire and elliptic to ovate or nearly lanceolate. They are 2–8 cm long, partly depending on the species, and generally are thick and leathery. In suitable climates some species flower through most of the year. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gymnosporia
''Gymnosporia'' is an Old World genus of plants, that comprise suffrutices, shrubs and trees. It was formerly considered congeneric with ''Maytenus'', but more recent investigations separated it based on the presence of achyblasts (truncated branchlets) and spines, alternate leaves or fascicles of leaves, an inflorescence that forms a dichasium, mostly unisexual flowers, and fruit forming a dehiscent capsule, with an aril on the seed. It is dioecious, with male and female flowers on separate plants. Range The genus occurs in all of Africa, Madagascar and adjacent islands, southern Spain, the Middle East, Afghanistan, Pakistan, India, Sri Lanka, Thailand, Vietnam, southern China, Taiwan, the Ryukyu Islands, Malesia, and in Queensland, Australia. In the Afrotropical realm the two main centers of diversity are in the south and the northeast. Species The genus includes some 114 species: * ''Gymnosporia acuminata'' Hook.f. ex M.A.Lawson * '' Gymnosporia addat'' Loes. * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Citrus
''Citrus'' is a genus of flowering trees and shrubs in the rue family, Rutaceae. Plants in the genus produce citrus fruits, including important crops such as oranges, lemons, grapefruits, pomelos, and limes. The genus ''Citrus'' is native to South Asia, East Asia, Southeast Asia, Melanesia, and Australia. Various citrus species have been used and domesticated by indigenous cultures in these areas since ancient times. From there its cultivation spread into Micronesia and Polynesia by the Austronesian expansion (c. 3000–1500 BCE); and to the Middle East and the Mediterranean (c. 1200 BCE) via the incense trade route, and onwards to Europe and the Americas. History Citrus plants are native to subtropical and tropical regions of Asia, Island Southeast Asia, Near Oceania, and northeastern Australia. Domestication of citrus species involved much hybridization and introgression, leaving much uncertainty about when and where domestication first happened. A genomic, phylog ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plant Stem
A stem is one of two main structural axes of a vascular plant, the other being the root. It supports leaves, flowers and fruits, transports water and dissolved substances between the roots and the shoots in the xylem and phloem, stores nutrients, and produces new living tissue. The stem can also be called halm or haulm. The stem is normally divided into nodes and internodes: * The nodes hold one or more leaves, as well as buds which can grow into branches (with leaves, conifer cones, or flowers). Adventitious roots may also be produced from the nodes. * The internodes distance one node from another. The term " shoots" is often confused with "stems"; "shoots" generally refers to new fresh plant growth including both stems and other structures like leaves or flowers. In most plants stems are located above the soil surface but some plants have underground stems. Stems have four main functions which are: * Support for and the elevation of leaves, flowers, and fruits. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leaf Morphology Apical Process Spinose-pungent
A leaf (plural, : leaves) is any of the principal appendages of a vascular plant plant stem, stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, stem, flower, and fruit collectively form the shoot system. In most leaves, the primary photosynthesis, photosynthetic tissue is the palisade mesophyll and is located on the upper side of the blade or lamina of the leaf but in some species, including the mature foliage of ''Eucalyptus'', palisade mesophyll is present on both sides and the leaves are said to be isobilateral. Most leaves are flattened and have distinct upper (Glossary of botanical terms#adaxial, adaxial) and lower (Glossary of botanical terms#abaxial, abaxial) surfaces that differ in color, hairiness, the number of stomata (pores that intake and output gases), the amount and structure of epicuticular wax and other features. Leaves are mostly green in color due ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leaf Morphology Tooth Spinose
A leaf ( : leaves) is any of the principal appendages of a vascular plant stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, stem, flower, and fruit collectively form the shoot system. In most leaves, the primary photosynthetic tissue is the palisade mesophyll and is located on the upper side of the blade or lamina of the leaf but in some species, including the mature foliage of ''Eucalyptus'', palisade mesophyll is present on both sides and the leaves are said to be isobilateral. Most leaves are flattened and have distinct upper (adaxial) and lower ( abaxial) surfaces that differ in color, hairiness, the number of stomata (pores that intake and output gases), the amount and structure of epicuticular wax and other features. Leaves are mostly green in color due to the presence of a compound called chlorophyll that is essential for photosynthesis as it absorbs lig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stem Morphology Type Areole
Stem or STEM may refer to: Plant structures * Plant stem, a plant's aboveground axis, made of vascular tissue, off which leaves and flowers hang * Stipe (botany), a stalk to support some other structure * Stipe (mycology), the stem of a mushroom under the cap * Stem (vine), part of a grapevine * Trunk (botany), the woody stem of a tree Education * Science, technology, engineering, and mathematics (STEM), a broad term used in curricula and policy * STEM.org, an educational publisher and service * Stem, a multiple choice question lede (excluding the options) Language and writing * Word stem, the part of a word common to all its inflected variants ** Stemming, a process in natural language processing * Stem (typography), the main vertical stroke of a letter * Stem (music), a part of a written musical note Man-made objects * Stem (ship), the upright member mounted on the forward end of a vessel's keel, to which the strakes are attached * Stem (bicycle part), connects ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stem Morphology Type Thorn
Stem or STEM may refer to: Plant structures * Plant stem, a plant's aboveground axis, made of vascular tissue, off which leaves and flowers hang * Stipe (botany), a stalk to support some other structure * Stipe (mycology), the stem of a mushroom under the cap * Stem (vine), part of a grapevine * Trunk (botany), the woody stem of a tree Education * Science, technology, engineering, and mathematics (STEM), a broad term used in curricula and policy * STEM.org, an educational publisher and service * Stem, a multiple choice question lede (excluding the options) Language and writing * Word stem, the part of a word common to all its inflected variants ** Stemming, a process in natural language processing * Stem (typography), the main vertical stroke of a letter * Stem (music), a part of a written musical note Man-made objects * Stem (ship), the upright member mounted on the forward end of a vessel's keel, to which the strakes are attached * Stem (bicycle part), connects the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rose
A rose is either a woody perennial flowering plant of the genus ''Rosa'' (), in the family Rosaceae (), or the flower it bears. There are over three hundred species and tens of thousands of cultivars. They form a group of plants that can be erect shrubs, climbing, or trailing, with stems that are often armed with sharp prickles. Their flowers vary in size and shape and are usually large and showy, in colours ranging from white through yellows and reds. Most species are native to Asia, with smaller numbers native to Europe, North America, and northwestern Africa. Species, cultivars and hybrids are all widely grown for their beauty and often are fragrant. Roses have acquired cultural significance in many societies. Rose plants range in size from compact, miniature roses, to climbers that can reach seven meters in height. Different species hybridize easily, and this has been used in the development of the wide range of garden roses. Etymology The name ''rose'' comes from L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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