Polygonum arenastrum leaf2 : 無料・フリー素材/写真
Polygonum arenastrum leaf2 / Macleay Grass Man
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | Introduced, warm-season, annual or biennial, mat-forming herb, with a deep taproot. Stems are prostrate, to 1 m long and arise from the one point. Leaves are all the same size, hairless, blue-green and 8-30 mm long. Flowers are small (1.8-3 mm long), pink or white and solitary or in small clusters in the leaf axils. Flowering is in spring and summer. A native of Europe, it is a weed of disturbed areas, particularly roadsides, wasteland, cropping paddocks, gateways and degraded pastures. An indicator of poor ground cover. Can form dense mats in newly sown pastures and is a weed of summer fallows or summer crops suchas lucerne. Strongly competitive, it has vigorous seedlings with a strong tap root; mature plants inhibit the germination of many seedlings (allelopathic effect) particularly medic species. May be grazed by cattle and sheep, usually without a problem, but seeds can cause photosensitization in cattle and enteritis in all types of livestock; leaves occasionally cause dermatitis. Controlled with healthy vigorous pastures. Registered herbicides are available for control. |
| 撮影日 | 2005-02-04 12:49:46 |
| 撮影者 | Macleay Grass Man , Dungog, Australia |
| タグ | |
| 撮影地 | |
| カメラ | E5400 , NIKON |
| 露出 | 0.004 sec (1/259) |
| 開放F値 | f/7.9 |
| 焦点距離 | flowerheadsclustered flowerheadssolitary flowerspink flowerswhite leafmarginsentire leaveselliptic leavesovate leavespetiolate leavessimple plantsherb plantsperennial plantsprostrate Polygonaceae "Polygonum arenastrum" Wireweed |