Myriophyllum aquaticum stem5 : 無料・フリー素材/写真
Myriophyllum aquaticum stem5 / 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, perennial aquatic or semi-aquatic herb that roots freely from the lower nodes. Stems are to 5 m long, often protruding about 30 cm above the water. Emergent leaves occur in whorls of 4-6 and are hairless, grey-green and feather-like (10-18 pairs of leaflets). Only female plants are present in Australia; flowers are solitary and tiny (to 0.5 mm long) in the leaf axils. Flowering is during the warmer months. A native of central South America, it is an escapee from aquariums and water-gardens, and now an environmental weed. Found in shallow, still to slow-flowing, dams, pools and creeks, especially if nutrient enriched. Spread only by stem fragments via humans and water as fruit are not formed in Australia. Can form dense stands that choke waterways and exclude native plants and animals. Control by manual removal over the warmer months; dry out in the sun and don’t dispose of near creeks or ditches. There are no registered herbicides for control. |
| 撮影日 | 2008-03-18 12:36:37 |
| 撮影者 | Macleay Grass Man , Dungog, Australia |
| タグ | |
| 撮影地 | |
| カメラ | E5400 , NIKON |
| 露出 | 0.013 sec (1/78) |
| 開放F値 | f/6.3 |
| 焦点距離 | "Brazilian Water-milfoil" flowerheadssolitary flowerswhite Haloragaceae introduced leavesglaucous leavespinnate leaveswhorled "Myriophyllum aquaticum" "Parrots Feather" plantsaquatic plantsdioecious plantsperennial "Water Milfoil" weed |