Agriculture Reference
In-Depth Information
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emergent (emersed)—most of the plant extends above the water sur-
face. Examples are cattails, bulrushes, arrowheads, and reeds (
Figure
3.15
shows the common cattail)
•
floating—all or part of the plant floats on the surface. Examples are
waterlilies, duckweeds, waterlettuce, and waterhyacinth
•
submergent (submersed)—all of the plant grows beneath the water
surface. Examples are watermilfoil, elodea, naiads, pond weeds
(Potamogeton), and coontails.
Figure 3.12
Bull thistle is also a biennial.
Emergent and floating plants, like some land plants, have a thick outer
layer on their leaves and stems which hinders herbicide absorption. Submer-
gent plants have a very thin outer layer on their leaves and stems and are very
susceptible to herbicide injury.