سلام نه از خانواده چنوپیدیاسه نیست ولی با عکسهای زیر کاملا مشخصه از چه خانواده ای می باشد
مسابقه علمی *** کی این علف هرز را می شناسه ؟
- شروع کننده موضوع **آگاهدخت**
- تاریخ شروع
Convolvulus arvensis آلوشک-لبلاب-نیلوفرصحرایی-پیچک صحرایی-لولوکسلام نه از خانواده چنوپیدیاسه نیست ولی با عکسهای زیر کاملا مشخصه از چه خانواده ای می باشد
اگه درست بود سوال بعد را لطفا خودتان طرح کنید.خانم مهندس جعفری زاده
بله درسته بفرمایید سوال بعدی با شما
سلام
این سوال واقعا جایزه داره ؟
این سوال واقعا جایزه داره ؟
آخرین ویرایش توسط مدیر:
از solanaceae ?
گیاه مهر گیاه (Mandragora autumnalis) از خانواده سیب زمینی (Solanaceae)
آخرین ویرایش:
سلام
بله درسته لطفا سوال بعدی؟جایزتون هم یک فلش 8 گیگ با یک روپوش .نزدیک هستید تشریف آوردید شیراز تقدیم میکنم.چون نزدیک هستید میگم.
به من یه ایمیل یزنید yazdan.taheri@bayer.com
این هم سوال بعد:
گونه اش واسه من مهمه...
hordeum jubatum
من هم با همین نام علمی موافقم
که همون جو موشک میشه
[h=1][/h]
| Foxtail barley | |
|---|---|
| |
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Monocots |
| (unranked): | Commelinids |
| Order: | Poales |
| Family: | Poaceae |
| Genus: | Hordeum |
| Species: | H. jubatum |
| Binomial name | |
| Hordeum jubatum L. |
Hordeum jubatum (Foxtail barley) is a perennials plant species in the grass family Poaceae. It occurs wild mainly in northern North America and adjacent northeastern Siberia. However, as it escaped often from gardens it can be found worldwide in areas with temperate to warm climates, and is considered a weed in many countries. The species is a polyploid and originated via hybridization of an East Asian Hordeum species with a close but extinct relative of Californian H. brachyantherum. It is grown as an ornamental plant for its attractive inflorescences and when done flowering for its infructescence.
| [h=2]Contents[/h] |
[h=2]Seedling[/h] Foxtail barley is a prolific seed producer, with each plant capable of producing upwards of 200 seeds. Seeds are elliptical, yellowish-brown and about a ¼ inch long with four to eight awns. The seeds have sharp, backwards pointing barbs. Seed is dispersed by wind, machinery and animals and germinates in the cooler temperatures of the spring or fall. Seed germinating in the fall can overwinter and resume growth in early spring, giving Foxtail barley a competitive advantage over many crops. Germination is inhibited by warm temperatures and seeds require a period of darkness for germination to occur. Foxtail barley is a shallow-rooted plant with germination occurring at soil depths not greater than three inches. The seedling of Foxtail barley first appears as thin, vertical leaves covered in short, dense hairs. The leaves have prominent venation and rough margins, while auricles are absent or elemental and the membranous ligule is very short with fine hairs.
[h=2]Juvenile/Mature[/h] Foxtail barley is a fibrous-rooted, densely tufted grass that grows from 30 cm to 100 cm tall and is erect or reclining at the base. The stems are erect and smooth and the leaf sheaths are split and hairy. The inflorescence of the mature plant is a dense, long-awned nodding spike with greenish or purplish colouring. The jointed rachis breaks into sharply pointed segments with three spikelets composing each segment. Only the central spikelet has one creamy coloured seed while each segment has seven awns with upward pointing barbs. These awns are up to three inches long and become easily attached to animals, clothing, machinery, etc. Leaf blades are slender and a greyish-green colour.
[h=2]Ecological Impact[/h] Foxtail barley is distinguished from cultivated barley (Hordeum vulgare L.) and Meadow barley (Hordeum brachyantherum) by lemma awn length. H. brachyantherum has awn lengths of ½ an inch; Foxtail barley has lengths of ½-3 inches; and cultivated barley of 10–15 cm in length. Once Foxtail barley is established, it becomes extremely difficult to eradicate. Its extensive root systems and aggressive habit, as well as its ability to tolerate saline soils make it a resilient competitor. It is considered a weed because of this competitive ability and the dangers it poses to wildlife and livestock. While Foxtail barley may be palatable for animals in early spring before it flowers, its seed heads, when dry, are very harmful to grazing animals. The awns with upward-pointing barbs become easily attached and embedded in the animal's mouth and face, causing severe irritation, abscesses, and even blindness. Foxtail barley is also host to a number of viruses, and because it harbours wheat rust and blackstem rust, can indirectly affect the development of field crops. Since Foxtail barley accumulates high amounts of salt in its leaves and roots, it has the potential of reducing soil salinity. Given Foxtail barley's ability to withstand saline soils, it has been identified as having potential for the revegetation of saline mine spoils to reduce erosion. It has also been recommended as a species suitable for wildlife habitat rehabilitation on disturbed lands, but given its other less desirable traits, other natural grass species would be more beneficial.
[h=2]References[/h]
- Pink, A. (2004). Gardening for the Million. Project Gutenberg Literary Archive Foundation.
- R. von Bothmer, N. Jacobsen, C. Baden, R. B. Jørgensen & I. Linde-Laursen (1995). An ecogeographical study of the genus Hordeum, 2nd ed.. International Plant Genetic Resources Institute, Rome. ISBN 92-9043-229-2.
- Blattner, F. R. (2004). "Phylogenetic analysis of Hordeum (Poaceae) as inferred by nuclear rDNA ITS sequences". Molecular Phylogenetics and Evolution 33 (2): 289–299. doi:10.1016/j.ympev.2004.05.012. PMID 15336664.
- Blattner, F. R. (2006). "Multiple intercontinental dispersals shaped the distribution area of Hordeum (Poaceae)". New Phytologist 169 (3): 603–614. doi:10.1111/j.1469-8137.2005.01610.x. PMID 16411962
بله دقیقا درسته، آفرین. از خیال شیشه ای هم به خاطر توضیحات تشکر میکنم. مهندس طاهری منتظر سوال بعدیتون هستیم...
سلام
خیال شیشه ای ببخشید.من تقاضا میکنم شما سوال بعد رابفرمایید چون توضیحات کاملی دادید این حق شماست.منتظریم بفرمایید........
خیال شیشه ای ببخشید.من تقاضا میکنم شما سوال بعد رابفرمایید چون توضیحات کاملی دادید این حق شماست.منتظریم بفرمایید........
آخرین ویرایش توسط مدیر:
پیاز منگوله (Allium atroviolaceum)
نه مهندس!
جنس رو درست گفتید اما گونه اش اشتباه !
allium giganteum
نه مهندس گل!
allium canadense حتما اینه
Allium commutatum
??????
??????
کاملا درسته
توصیجات و سوال بعدی!
Allium commutatum
این هم درسته
=============================================
شکل اول اسم علمیش allium canadense
و دومی هم Allium commutatum این بود به هر حال هر دو سیر وحشی بودن اما از گونه های مختلف!
یعنی کسی متوجه نشد تصاویر کمی فرق میکنه ؟؟
باز هم ببخشید اگه دو تا تصویر گذاشته بودم
فقط میخواستم ببینم کسی تفاوت عکس ها رو حس میکنه یا نه !
سوال بعد اگاهدخت عزیز یا مهندس hfarda2011 بذارن !
یه پیشنهاد هم داشتم بعضی از گونه ها مثه این نوع گونه که از نظر ظاهری تا حدودی شبیه هم هستن
رو میشه دو تا گذاشت هم گونه ها رو تشخیص بدیم و هم تفاوت گونه ها رو بهتر بشناسیم و کمی هم تو این بخش شناسایی علف هرز تنوع ایجاد بشه
ممنون
آخرین ویرایش:
Allium commutatum
A very late flowering Allium for a Mediterranean species, in bloom from July later. This curious species grows on rocky slopes just in front of sea and at time of flowering is totally leafless. Bulbs are salt resistant and floaters, and they are dispersed during sea storms. Plants are found also growing deeply embedded in the pebbles of the beaches, fallen down from the above slopes.
A very late flowering Allium for a Mediterranean species, in bloom from July later. This curious species grows on rocky slopes just in front of sea and at time of flowering is totally leafless. Bulbs are salt resistant and floaters, and they are dispersed during sea storms. Plants are found also growing deeply embedded in the pebbles of the beaches, fallen down from the above slopes.
سلام
سوال بعدی
بفرمایید لطفا اسم این علف هرز ؟
سوال بعدی
بفرمایید لطفا اسم این علف هرز ؟
قمیش (Arundo donax)
عکس پائینی گونه زینتیه قمیش است به نام Arundo donax "Versicolor"
عکس پائینی گونه زینتیه قمیش است به نام Arundo donax "Versicolor"
آخرین ویرایش:
Arundo donax L.
| نام تیره انگلیسی : Poaceae - Gramineae نام تیره فارسی : گندميان نام فارسی : ني، خيزران، قميش نام انگلیسی : Giant reed, Bamboo reed, Spanish reed | |||||
| شکل زندگی : چندساله، ساقه‌ها به صورت دسته‌اي، ريزوم‌دار طول عمر : چند ساله | |||||
| ساقه : افراشته، به ندرت منشعب، به ارتفاع 200-400 (-600) س‌م | |||||
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| رویشگاه : زمينهاي باير و رويشگاههاي آبي | |||||
| تعداد لپه : تک لپه |
