emergent
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Wetland and Aquatic Plants of Oklahoma

Interactive Keys: Emergent

Yellow Flowers

2. Flowers with four petals
      A. Brassiaceae
      B. Onagraceae
           i. Ludwigia spp.
            a. plants growing upright
               b. plants growing prostrates, creeping, or slightly upright

Mustards (Brassicaceae)

Stalkless yellowcress (Rorippa sessiliflora (Nutt.) A.S. Hitchc.) 
Native annual.
                                                                                                                                                                Click thumbnail to enlarge

Rorippa sessiliflora map                                    Rorippa sessiliflora

Note: Flowers and fruits without a stalk (peduncle).

NWI status: FACW+

Spreading yellowcress (Rorippa sinuata (Nutt.) A.S. Hitchc.) 
Native perennial.

Rorippa sinuata map                               Rorippa sinuata

NWI status: FACW

Evening primrose (Onagraceae)
 
(Ludwigia spp.)

Note: The seeds of some species are eaten by waterfowl and other birds.

Plants growing upright

Seedbox (Ludwigia alternifolia L.) 
Native perennial.

Ludwigia alternifolia map                                     Ludwigia alternifolia

Note: Leaves alternate along the stem.

NWI status: OBL

Wingleaf primrose-willow (Ludwigia decurrens Walt.) 
Native perennial.

Ludwigia decurrens map                               Ludwigia decurrens

Note: Leaves opposite one another along the stem.  Fruits and stems are winged.

NWI status: OBL

Cylindricfruit primrose-willow (Ludwigia glandulosa Walt.) 
Native perennial.

Ludwigia glandulosa map                              Ludwigia glandulosa

Note: Leaves alternate along the stem.

NWI status: OBL

Spindleroot (Ludwigia hirtella Raf.) 
Native perennial.

Ludwigia hirtella map                              Ludwigia hirtella

Note: Leaves opposite one another along the stem.  Spreading hairs occur on stems, leaves, and fruits.

NWI status: FACW+ 

Plants growing prostrate, creeping, or slightly upright

Anglestem primrose-willow (Ludwigia leptocarpa (Nutt.) Hara) 
Native perennial.

Ludwigia leptocarpa map                              Ludwigia leptocarpa

Note: Flowers and fruits on a short stalk (peduncle).

NWI status: OBL

Marsh seedbox (Ludwigia palustris (L.) Ell.) 
Native perennial.

Ludwigia palustris map                               Ludwigia palustris

Note: Flowers have no petals.

NWI status: OBL 

Floating primrose-willow (Ludwigia peploides (Kunth) Raven) 
Native perennial.

Ludwigia peploides map                       Ludwigia peploides

Note: A very common species in marshes and pond margins in eastern Oklahoma.

NWI status: OBL

Creeping primrose-willow (Ludwigia repens J.R. Forst.) 
Native perennial.

Ludwigia repens map                              Ludwigia repens

Note: A small plant which grows along muddy shorelines or in shallow water.  Flowers have very small petals.

NWI status: OBL

 

Last update: 2/25/04
Comments to : Bruce Hoagland

bhoagland@ou.edu

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