Aquatic Plant Identification

Question 1

Types of algae that may become pests in Texas water include:

Answer 1

Filamentous
Chara
Planktonic

Question 2

This floating weed is very small, has one to three light green leaves, and can cause oxygen depletion if allowed to cover the entire surface of a pond.

Answer 2

Common duckweed

Question 3

This non-native floating plant has oblong leaves with a distinct midrib and it is illegal to possess or transport it.

Answer 3

Giant salvinia

Question 4

All of these floating plants are non-native and are illegal to possess or transport except:

Common salvinia
Water hyacinth
Mosquito fern
Giant salvinia

Answer 4

Mosquito fern

Question 5

This type of aquatic weed has flaccid stems and may be managed using aquashade.

Answer 5

Submerged

Question 6

This submerged perennial weed is native to Europe and has alternate oblong leaves that are toothed with a distinct midrib.

Answer 6

Curly-leaved pondweed

Question 7

This invasive, submerged plant is considered a noxious pest because it grows so rapidly it out competes and eliminates native species, hinders recreation and navigation, an blocks water intakes.

Answer 7

Hydrilla

Question 8

This submerged perennial arises from thickly matted rhizomes, has no floating leaves, and is an excellent food source for waterfowl.

Answer 8

Sago pondweed

Question 9

___ Is a submerged, grass like plant that can grow up to 6 feet tall and has bright yellow, star shaped flowers

Answer 9

Water stargrass

Question 10

This aquatic weed is very invasive, has soft whitish hairs in leaf axil, and flowers that resemble those of white clover.

Answer 10

Alligatorweed

Question 11

This emerged, woody shrub can occasionally grow into a small tree and is controlled only by the herbicide glyphosate.

Answer 11

Buttonbush

Question 12

___ is a very primitive, emerged, perennial weed that may be found in standing water or in wet areas. It has silicon embedded in the stem tissue.

Answer 12

Horsetail

Question 13

There are many species of these that are difficult to identify and are often confused with grasses and sedges.

Answer 13

Rushes

Question 14

This non-native is grazed by nutria, rabbits and other rodents and has been successfully controlled by glyphosate.

Answer 14

Torpedograss

Question 15

This perennial, emerged weed may stand erect along the shoreline or creep across wet soil or water. It has single yellow flowers and may be an aggressive invader of ponds

Answer 15

Water primrose