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
Note: Flowers and fruits without a stalk
(peduncle).
NWI
status: FACW+
Spreading
yellowcress (Rorippa
sinuata (Nutt.) A.S. Hitchc.)
Native perennial.
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.
Note: Leaves alternate along the stem.
NWI
status: OBL
Wingleaf primrose-willow (Ludwigia
decurrens Walt.)
Native perennial.
Note: Leaves opposite one another along the stem. Fruits and stems are winged.
NWI
status: OBL
Cylindricfruit
primrose-willow (Ludwigia glandulosa
Walt.)
Native perennial.
Note: Leaves alternate along the stem.
NWI
status: OBL
Spindleroot (Ludwigia
hirtella Raf.)
Native perennial.
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.
Note: Flowers and fruits on a short stalk
(peduncle).
NWI
status: OBL
Marsh
seedbox (Ludwigia
palustris (L.) Ell.)
Native
perennial.
Note: Flowers have no petals.
NWI
status: OBL
Floating
primrose-willow (Ludwigia
peploides (Kunth) Raven)
Native
perennial.
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.
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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