Selected images for twoleaf watermilfoil (Myriophyllum heterophyllum )
Variable watermilfoil is a perennial, aquatic herb that has leaves of two noticeably different forms. The submerged leaves are finely dissected, whorled, reddish/greenish-brown, and ½-2 ½ in. (1.3-6.4 cm) long. The emergent leaves are small, oval, bright green, whorled and up to ¼ in. (0.6 cm) wide. Emergent leaves stand 6-8 in. (15.2-20.3 cm) out of the water and may not be apparent until late summer. Flowering occurs from June to September. Flowers are emergent on 2-12 in. (5.1-30.5 cm), green to reddish stalks. Petals are less than 0.1 in. (3 mm) in length and are subtended by downward curved bracts. Fruits are small, nearly round and have a rough surface. Variable watermilfoil is native to the southern United States, but is considered invasive in much of the northeast. This species is listed as endangered or threatened in three states (Kentucky, Ohio, and Pennsylvania).
| 4 Images | View Subjects Page | Send to Your Light Box |
|
|
|
|
||||
5273020 twoleaf watermilfoil Myriophyllum heterophyllum Infestation Leslie J. Mehrhoff |
5273021 twoleaf watermilfoil Myriophyllum heterophyllum Foliage Leslie J. Mehrhoff |
5308025 twoleaf watermilfoil Myriophyllum heterophyllum Plant(s) USDA PLANTS Database |
5308026 twoleaf watermilfoil Myriophyllum heterophyllum Plant(s) USDA PLANTS Database |
