Not a grass, but a broadleaf weed (Ludwigia species, likely Ludwigia decurrens or Ludwigia alternifolia).
Ludwigia species · Warm-season, perennial broadleaf plant, C3 or C4 pathway not applicable to grasses.
AI-generated identification · may be incorrect
Grass Category
Invasive/Weed
Hardiness Zones
USDA Zones 4 through 10, depending on the specific Ludwigia species and local moisture availability.
About This Grass
Forms upright stems with lanceolate leaves and distinct bright yellow four-petaled flowers, typically reaching 1 to 3 feet in height.
Blade Characteristics
Leaves are simple, alternate or opposite, lance-shaped with entire margins, pointed tips, and lack traditional grass ligules, auricles, or parallel venation.
Growing Information
Growth Habit
Stoloniferous or upright branching stems, spreading moderately through seeds and root nodes.
Sunlight & Water Needs
Thrives in full sun to partial shade with high moisture needs, frequently found in wet soils, ditches, or damp areas.
Mowing & Maintenance
Controlled primarily by manual removal, broadleaf herbicides, or improving site drainage; not managed as a turfgrass.