Bidens pilosa fruit NC2 : 無料・フリー素材/写真
Bidens pilosa fruit NC2 / 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 to short-lived perennial, hairless to densely hairy herb to 1 m tall. Leaves are opposite, 6-12 cm long, 3-5 lobed and toothed. Flowerheads are in loose cymes or heads are solitary. Heads are 5-15 mm wide, with yellow central florets; white ray florets may be present. Fruit are 6-12 mm long, dark and linear; with 2-3 barbs at the tip. Flowering is year-round, but mainly from summer to autumn. A native of tropical America, it is a weed of disturbed areas, such as roadsides, pastures, maize, and sorghum. Sometimes incorrectly referred to as fleabane. An indicator of disturbance or low ground cover. Potentially toxic to sheep and cattle when plants accumulate high levels of nitrate (more likely on fertile sites). The risk to goats is low. Plants with normal nitrate levels are palatable and safe to graze. Burrs are a nuisance as they readily attached to clothing and fur. Aromatic oil in the plant has an offensive smell and can taint milk. Plants can be controlled by healthy vigorous pastures, grazing (goats preferred), chipping or hand pulling, slashing and herbicides. |
| 撮影日 | 2005-07-22 13:30:46 |
| 撮影者 | Macleay Grass Man , Dungog, Australia |
| タグ | |
| 撮影地 | |
| カメラ | E5400 , NIKON |
| 露出 | 0.008 sec (1/119) |
| 開放F値 | f/7.9 |
| 焦点距離 | Asteraceae "Cobblers Pegs" "Devils Pitch-forks" "Farmers Friends" floretstubularligulate floretswhite floretsyellow introduced leafmarginstoothed leaveslobed leavesopposite leavespetiolate pappusbarbed plantsannual plantsherb weed |