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Perigynium
In botany, a perigynium (plural: perigynia), also referred to as a utricle, typically refers to a sac that surrounds the achene of plants in the genus ''Carex'' (Cyperaceae). The perigynium is a modified prophyll, tissue of leaf origin, that encloses the dry, one-seeded achene. In liverworts, "perigynium" refers to a tube-shaped structure which encases the archegonium and the developing sporophyte. The location, size, shape, hairiness, color, and other aspects of the perigynium are important structures for distinguishing ''Carex'' species. They are often subtended by a scale, which may also aid in identification. Dispersal Features of the perigynium may aid in seed dispersal, such as a surface that clings to fur or skin or a shape that enables dispersion via wind or water. Seed dispersal by animals such as ants (myrmechory) has been recorded, as some species of sedges have developed elaiosomes at the base of the perigynia. Ants carry the perigynium back to the nest, use the elaios ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carex Buxbaumii Kz1
''Carex'' is a vast genus of more than 2,000 species of grass-like plants in the family Cyperaceae, commonly known as sedges (or seg, in older books). Other members of the family Cyperaceae are also called sedges, however those of genus ''Carex'' may be called true sedges, and it is the most species-rich genus in the family. The study of ''Carex'' is known as caricology. Description All species of ''Carex'' are perennial, although some species, such as '' C. bebbii'' and '' C. viridula'' can fruit in their first year of growth, and may not survive longer. They typically have rhizomes, stolons or short rootstocks, but some species grow in tufts (caespitose). The culm – the flower-bearing stalk – is unbranched and usually erect. It is usually distinctly triangular in section. The leaves of ''Carex'' comprise a blade, which extends away from the stalk, and a sheath, which encloses part of the stalk. The blade is normally long and flat, but may be folded, inrolled, cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carex
''Carex'' is a vast genus of more than 2,000 species of grass-like plants in the family Cyperaceae, commonly known as sedges (or seg, in older books). Other members of the family Cyperaceae are also called sedges, however those of genus ''Carex'' may be called true sedges, and it is the most species-rich genus in the family. The study of ''Carex'' is known as caricology. Description All species of ''Carex'' are perennial, although some species, such as '' C. bebbii'' and '' C. viridula'' can fruit in their first year of growth, and may not survive longer. They typically have rhizomes, stolons or short rootstocks, but some species grow in tufts (caespitose). The culm – the flower-bearing stalk – is unbranched and usually erect. It is usually distinctly triangular in section. The leaves of ''Carex'' comprise a blade, which extends away from the stalk, and a sheath, which encloses part of the stalk. The blade is normally long and flat, but may be folded, inrolled, c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carex Buxbaumii
''Carex buxbaumii'' is a species of sedge known as Buxbaum's sedge or club sedge. It is native to much of the northern Northern Hemisphere, from Alaska to Greenland to Eurasia, and including most of Canada and the United States. It grows in wet habitat, such as marshes and fens. This sedge grows in clumps from long rhizomes. The stems are in maximum height. The leaves are narrow and small. The inflorescence has a bract which is sometimes longer than the spikes. The fruits have dark-colored bracts and a sac called a perigynium In botany, a perigynium (plural: perigynia), also referred to as a utricle, typically refers to a sac that surrounds the achene of plants in the genus ''Carex'' (Cyperaceae). The perigynium is a modified prophyll, tissue of leaf origin, that enclos ... or utricle which is gray-green and rough in texture. References External linksJepson Manual Treatment [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southern Illinois University Press
Southern Illinois University Press or SIU Press, founded in 1956, is a university press located in Carbondale, Illinois, owned and operated by Southern Illinois University. The press publishes approximately 50 titles annually, among its more than 1,200 titles currently in print. Southern Illinois University Press is a member of the Association of American University Presses. History Southern Illinois University Press was founded by President Delyte Morris in the mid-1950s, and its first book—Charles E. Colby's A Pilot Study of Southern Illinois—was published on October 20, 1956. Publishing primarily in the humanities and social sciences, in a wide range of subject areas: art and architecture, classical studies, history (world and American), literary criticism, philosophy, religion, rhetoric and composition, speech communication, and theatre. The Press has become especially well known for its publications in First Amendment Studies, Restoration and Eighteenth Century Theatre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kobresia
''Kobresia'' is a genus of plants in the sedge family. They are sometimes called bog sedges. These perennial sedges are quite similar to ''Carex'' species in appearance. The genus is widespread across much of Europe, Asia and North America, with many species native to the Himalayas. Species *'' Kobresia burangensis'' Y.C.Yang – Tibet *'' Kobresia capillifolia'' (Decne.) C.B.Clarke – Central Asia, Himalayas, Tuva region of Siberia, Mongolia, central and western China including Tibet and Xinjiang *''Kobresia cercostachys'' (Franch.) C.B.Clarke – Eastern Himalayas, Nepal, Bhutan, Tibet, Yunnan *''Kobresia condensata'' (Kük.) S.R.Zhang & Noltie – Sichuan, Yunnan *''Kobresia cuneata'' Kük – Tibet to central China *'' Kobresia curticeps'' (C.B.Clarke) Kük. in H.G.A.Engler – Tibet, Nepal, Bhutan *'' Kobresia curvirostris'' (C.B.Clarke) C.B.Clarke in J.D.Hooker – Bhutan, Arunachal Pradesh, Thailand *'' Kobresia duthiei'' C.B.Clarke in J.D.Hooker – Tibet, Nepal, Bhutan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carex Hirta
''Carex hirta'', the hairy sedge or hammer sedge, is a species of sedge native across Europe. It has characteristic hairy leaves and inflorescences, and is the type species of the genus ''Carex''. Description ''Carex hirta'' grows tall, with leaves long and (occasionally up to ) wide. The stems are trigonous (roughly triangular in cross-section), but with convex, rounded faces. The leaves, leaf sheaths and ligules are all hairy, although plants growing in wetter positions may be less hairy; these have sometimes been separated as ''C. hirta'' var. ''sublaevis'' by Jens Wilken Hornemann, but this may not be a worthwhile taxon. The culms bear 2–3 lateral female spikes, each long, and on half-ensheathed peduncles up to twice the length of the spike. There are 2–3 male spikes at the end of the culm, each long. The hairy utricles, male glumes and leaves make it hard to confuse ''Carex hirta'' with any other ''Carex'' species. Distribution ''Carex hirta'' is native to Europ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carex Michelii
''Carex michelii'' is a species of sedge (family Cyperaceae The Cyperaceae are a family of graminoid (grass-like), monocotyledonous flowering plants known as sedges. The family is large, with some 5,500 known species described in about 90 genera, the largest being the "true sedges" genus ''Carex'' w ...), native to central, southern and eastern Europe, Turkey, the Caucasus, and Iran. It is typically found in semiarid grasslands. References michelii Flora of France Flora of Central Europe Flora of Southeastern Europe Flora of Ukraine Flora of the Crimean Peninsula Flora of Central European Russia Flora of South European Russia Flora of the Caucasus Flora of Turkey Flora of Iran Plants described in 1797 {{Carex-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carex Melanostachya
''Carex melanostachya'', called the Great Plains sedge, is a species of flowering plant in the genus ''Carex ''Carex'' is a vast genus of more than 2,000 species of grass-like plants in the family Cyperaceae, commonly known as sedges (or seg, in older books). Other members of the family Cyperaceae are also called sedges, however those of genus ''Carex'' ...'', native to central Europe to western Asia, and introduced to the central US. Its chromosome number is 2n=54, with some uncertainty. References melanostachya Plants described in 1805 {{Carex-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Myrmechory
Myrmecochory ( (sometimes myrmechory); from grc, μύρμηξ, mýrmēks ("ant") and ''khoreíā'' ("circular dance") is seed dispersal by ants, an ecologically significant ant–plant interaction with worldwide distribution. Most myrmecochorous plants produce seeds with elaiosomes, a term encompassing various external appendages or "food bodies" rich in lipids, amino acids, or other nutrients that are attractive to ants. The seed with its attached elaiosome is collectively known as a diaspore. Seed dispersal by ants is typically accomplished when foraging workers carry diaspores back to the ant colony, after which the elaiosome is removed or fed directly to ant larvae. Once the elaiosome is consumed, the seed is usually discarded in underground middens or ejected from the nest. Although diaspores are seldom distributed far from the parent plant, myrmecochores also benefit from this predominantly mutualistic interaction through dispersal to favourable locations for germin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elaiosome
Elaiosomes ( grc, ἔλαιον ''élaion'' "oil" + ''sóma'' "body") are fleshy structures that are attached to the seeds of many plant species. The elaiosome is rich in lipids and proteins, and may be variously shaped. Many plants have elaiosomes that attract ants, which take the seed to their nest and feed the elaiosome to their larvae. After the larvae have consumed the elaiosome, the ants take the seed to their waste disposal area, which is rich in nutrients from the ant frass and dead bodies, where the seeds germinate. This type of seed dispersal is termed myrmecochory from the Greek "ant" (myrmex) and "circular dance" (khoreíā). This type of symbiotic relationship appears to be mutualistic, more specifically dispersive mutualism according to Ricklefs, R.E. (2001), as the plant benefits because its seeds are dispersed to favorable germination sites, and also because it is planted (carried underground) by the ants. Elaiosomes develop in various ways either from seed ti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Achene
An achene (; ), also sometimes called akene and occasionally achenium or achenocarp, is a type of simple dry fruit produced by many species of flowering plants. Achenes are monocarpellate (formed from one carpel) and indehiscent (they do not open at maturity). Achenes contain a single seed that nearly fills the pericarp, but does not adhere to it. In many species, what is called the "seed" is an achene, a fruit containing the seed. The seed-like appearance is owed to the hardening of the fruit wall (pericarp), which encloses the solitary seed so closely as to seem like a seed coat. Examples The fruits of buttercup, buckwheat, caraway, quinoa, amaranth, and cannabis are typical achenes. The achenes of the strawberry are sometimes mistaken for seeds. The strawberry is an accessory fruit with an aggregate of achenes on its outer surface, and what is eaten is accessory tissue. A rose produces an aggregate of achene fruits that are encompassed within an expanded hypanthium (aka f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sporophyte
A sporophyte () is the diploid multicellular stage in the life cycle of a plant or alga which produces asexual spores. This stage alternates with a multicellular haploid gametophyte phase. Life cycle The sporophyte develops from the zygote produced when a haploid egg cell is fertilized by a haploid sperm and each sporophyte cell therefore has a double set of chromosomes, one set from each parent. All land plants, and most multicellular algae, have life cycles in which a multicellular diploid sporophyte phase alternates with a multicellular haploid gametophyte phase. In the seed plants, the largest groups of which are the gymnosperms and flowering plants (angiosperms), the sporophyte phase is more prominent than the gametophyte, and is the familiar green plant with its roots, stem, leaves and cones or flowers. In flowering plants the gametophytes are very reduced in size, and are represented by the germinated pollen and the embryo sac. The sporophyte produces spores (hence t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
