Ludwigia (Single) refers to an individual stem or plant of Ludwigia peruviana, emphasizing its solitary character before it forms larger colonies. A single plant displays upright, somewhat woody stems with broad, oval green leaves and occasional yellow flowers that emerge from the upper nodes. When viewed alone, Ludwigia peruviana appears more shrub-like, revealing its branching structure and the reddish tint that sometimes appears on new growth.

As a standalone plant, it often establishes first in moist soil or shallow water before expanding outward. This single form highlights the species’ ability to anchor itself firmly and tolerate fluctuating water levels. Even in isolation, Ludwigia peruviana shows signs of its eventual tendency toward colonization, but its individual architecture is more legible and less overwhelming to the surrounding habitat.