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AWNS

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Exempel på hur man kan använda AWNS i en mening

  • In Asteraceae, the pappus may be composed of bristles (sometimes feathery), awns, scales, or may be absent, and in some species, is too small to see without magnification.
  • Bromus is distinguished from other grass genera by a combination of several morphological characteristics, including leaf sheaths that are closed (connate) for most of their length, awns that are usually inserted subapically, and hairy appendages on the ovary.
  • In species where awns are present they are found on the fertile, unstalked spikelet as an extension of the lemma.
  • Two other types of autochory not described in detail here are blastochory, where the stem of the plant crawls along the ground to deposit its seed far from the base of the plant; and herpochory, where the seed crawls by means of trichomes or hygroscopic appendages (awns) and changes in humidity.
  • During the daytime the humidity drops and the awns slacken back again; however, fine silica hairs on the awns act as ratchet hooks in the soil and prevent the spikelets from reversing back out again.
  • The glumes of a spikelet are narrow lanceolate, usually without any awns, while the lemmas are hard, three-veined, and have the three awns near the tip.
  • Depending on the initial concentration of inoculum and environmental conditions, infection can spread to the leaf sheath, stem, awns, and glumes.
  • Water absorbed by the cell wall binds to the matrix of the awns, causing it to expand and to drive the cellulose microfibrils apart, which causes the matrix to uncoil, thus straightening the awns.
  • Most of the species of the genus were originally described as members of Helianthus, based on having a pappus of two caducous awns.
  • Each spikelet is flat and has excurved awns, meaning the tip of each of the two to eight flowers on the spikelet curls outward.
  • It can often be distinguished from other bunchgrasses by the awns on its seedheads which stand out at an angle nearly 90 degrees from the stem.
  • The drooping inflorescence holds spikelets which are each about a centimeter long and have light-colored, hairlike awns.
  • It has a quite similar habitat to Alopecurus aequalis and Alopecurus geniculatus, but those species have quite shorter glumes and awns.
  • Aldama is currently, characterized by having a perennial herbaceous habit, a pappus usually of awns and scales, and a multi-seriate involucre.
  • Phoebanthus is characterized by having a pappus of short scales that are usually persistent (don't fall off) compared to the pappus of two deciduous awns (and sometimes a few scales) in Helianthus, and Phoebanthus is also characterized by a distinctive type of slender, horizontal tuber that forms the perennating organ.
  • As the grass expands or contracts according to the temperature and moisture conditions, the awns twist or untwist to eventually drill the seeds into the soil – a phenomenon known as geocarpy.
  • They tend to differ from North American and Eurasian species of Elymus in having more slender stems, longer, usually curved awns, and glumes that are shorter in relation to the lemmas.
  • Bidens cernua has yellow rays, achenes are wedge-shaped with retrorsed barbed awns, and simple unlobed leaves that are often roughly the same width along the entire length and lack a petiole.
  • In veterinary medicine the Hartmann, ear polypus forceps is used to remove awns or epilate hairs of dogs ears.
  • Calamagrostis tweedyi can be distinguished from other reedgrasses in the region by its flat broad leaves combined with long bent awns and only slightly hairy calluses.


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