

How to identify Water Arum (Calla palustris)
Water Arum, also known as Water-Dragon, Bog Arum, Calla Lily, Marsh Calla
Water Arum is an aquatic perennial with a spadix of tiny flowers surrounded by a spathe, typically mistaken for a single flower. The heart-shaped leaves are glossy and arise on long stalks directly from the rhizome. Their dark green appearance contrasts with the more flamboyant spathes, which bloom in the summer. Fruits emerge after flowering, bearing red berries. The plant flourishes in shallow water, up to 6 inches (15 cm) deep, and spreads to form dense colonies.
Heart-shaped glossy leaves on long stalks directly from the rhizome.
Single flower with greenish spadix, creamy white spathe, and small yellow flowers.
Bright red obovoid berries, each approximately 0.5 inches (1.27 cm) in diameter.
Smooth, green stem without branching, with petioles 3 to 8 inches (7.6 to 20.3 cm) long.
Leaves taper to a narrow point, measure 2 to 4 inches (5 to 10 cm), with curling edges.
The leaves of water Arum are medium to dark green and heart-shaped, tapering abruptly to a narrow point. They are simple with entire margins and edges that curl inward. Each leaf measures 2 to 4 inches (5 to 10 cm) long and has a waxy, smooth texture. The veins are not prominently visible, contributing to the leaf's overall smooth appearance, and the uniform green color enhances its glossy look.
Water Arum blooms from May to June with a single flower consisting of a greenish spadix and a creamy white spathe. The spadix, about 1 inch (2.5 cm) long, is densely covered with small yellow petal-less flowers. The spathe is oval to elliptic, measuring 1-3 inches (2.5-7.6 cm) long and 1 inch (2.5 cm) wide, exhibiting a waxy and smooth texture.
The stem of water Arum is smooth, green, and erect, contributing to its sturdy appearance. Typically, the petioles measure between 3 to 8 inches (7.6 to 20.3 cm) long and are notably stout, providing robust support for the plant. The stem lacks significant branching and maintains a consistent texture and color throughout its length, aiding in easy identification.
The fruit of water Arum is an obovoid berry transitioning in color from green or greenish-yellow when immature to a bright red at full maturity. They are approximately 0.5 inches (1.27 cm) in diameter. Inside, the fruit has a gelatinous texture enclosing seeds that are 0.25 inches (0.63 cm) long and dark brown. These seeds are somewhat flattened and elliptical, contributing to the fruit's distinctive appearance.
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Scientific Classification of Water Arum