Najas minor, Brittleleaf Naiad


Invasive Species: Najas minor, Brittleleaf Naiad

Brittleleaf naiad is an invasive annual forb that is native to Europe. The highly branched stems can grow up to 4 ft. (1.2 m) in length and fragment easily; hence the common name. Leaves are opposite, linear, and approximately 1 in. (2.5 cm) in length with prominent teeth along the margins. Flowering occurs in late spring to early summer, when small flowers develop in the axils of the leaves. Fruit are single-seeded. Germination …

Myriophyllum heterophyllum, Variable Watermilfoil


Invasive Species: Myriophyllum heterophyllum, Variable Watermilfoil

Variable watermilfoil is an invasive perennial aquatic herb that has leaves of two noticeably different forms. The submerged leaves are finely dissected, whorled, reddish/greenish-brown, and 1/2 to 2 1/2 in. (1.3 to 6.4 cm) long. The emergent leaves are small, oval, bright green, whorled, and up to 1/4 in. (0.6 cm) wide. Emergent leaves stand 6 to 8 in. (15.2 to 20.3 cm) out of the water and may not be apparent until …

Solanum tampicense, Wetland Nightshade


Invasive Species: Solanum tampicense, Wetland Nightshade

Wetland nightshade is a sprawling, semi-woody shrub that invades wetlands in Florida. The green stems are up to 15 ft. (4.6 m) long and prickly. Leaves are alternate, to 10 in. (25 cm) long, 3 in. (7 cm) wide, wavy along the margins with prickles on the veins. The small white flowers occur in small clusters at the leaf axils from summer to fall. The fruits are small tomato-like berries that turn bright …

Myriophyllum aquaticum, Parrotfeather Watermilfoil


Invasive Species: Myriophyllum aquaticum, Parrotfeather Watermilfoil

Parrotfeather watermilfoil is an herbaceous, rooted, submerged/emergent plant that invades aquatic habitats throughout much of the United States. Stems are stout and blue-green in color. Leaves are abundant, whorled, pinnately compound, and finely dissected. Submersed leaves are 0.6 to 1.4 in. (1.5 to 3.5 cm) long and have 20 to 30 divisions per leaf. Emergent leaves are 0.8 to 2 in. (2 to 5 cm) long, less divided, and greener than the submersed …

Cyperus entrerianus, Deeprooted Sedge


Invasive Species: Cyperus entrerianus, Deeprooted Sedge

Deeprooted sedge is a wetland sedge that invades disturbed areas throughout the southeastern United States. It is a robust, up to 40 in. (102 cm) tall, grass-like plant with deeply set, thick rhizomes and dark purple to black leaf bases. The leaves are basal, glossy, and flat or V-shaped. The terminal inflorescence has 5 to 11 elongate rays ending in densely clustered spikelets. A large plant can produce one million viable seeds a …

Colocasia esculenta, Coco Yam


Invasive Species: Colocasia esculenta, Coco Yam

Coco yam is an invasive perennial forb that originates from a large corm and can grow to 4 ft. (1.5 m) in height. Leaves, supported by petioles that are 3 ft. (1 m) long, are arrowhead shaped, up to 2 ft. (0.6 m) long and 1.6 ft. (0.5 m) wide, peltate, and velvety on their upper surfaces. Flowering seldom occurs outside the native range. Plants spread vegetatively through rhizomes. Some plants also spread …