American lotus

Scientific name: Nelumbo lutea. Verified common names: American lotus, yellow lotus. Family: Nelumbonaceae. Genus Nelumbo is distinct from water lilies (Nymphaeaceae) and is the only genus in Nelumbonaceae; this taxon is closely related to other Nelumbo species.

An emergent, rhizomatous aquatic perennial that typically forms dense colonies in shallow water. Plants produce long petioles arising from thick horizontal rhizomes; leaves are large, peltate (petiole attached near the center), round to slightly oblong and often held above the water surface rather than floating. Leaves typically exhibit a water-repellent (superhydrophobic) surface that causes water to bead and roll off.

Flowers are showy and solitary on stout stalks, opening above the leaves. Petals are numerous (often in multiple series) and range in color from pale yellow to creamy white; the central floral structure is a distinctive conical or flattened receptacle surrounded by numerous stamens. Flowers produce a prominent seedpod as they mature. Seasonal appearance: flowering generally occurs in the growing season when water and air temperatures are warm, while leaves persist through the season and die back as plants enter dormancy.

Typically found in shallow, still or slow-moving freshwater habitats such as ponds, oxbow lakes, marshes and slow rivers. Plants are rooted in muddy or silty substrate and commonly occupy open, sunny sites; they often tolerate a range of water depths within the littoral zone. Geographic distribution includes many U.S. states (reported in AL, AR, CA, CT, DE and 27 more), with populations primarily in eastern and central North America and occurrences elsewhere where conditions permit.

Flowers attract a variety of insect visitors, including bees and other pollinators, which forage for nectar and pollen. Seedheads provide a food source for waterfowl and other wetland wildlife; rhizomes and tubers may be used by mammals that forage in marshy areas. Dense stands can influence wetland structure by stabilizing sediments and providing habitat for aquatic organisms.

Populations can be vulnerable to wetland drainage, shoreline development and competition from invasive aquatic plants, and may be locally uncommon where habitat has been lost. Fascinating traits include the highly water-repellent leaf surface (the “lotus effect”) and the genus-wide capacity for producing long-lived, robust seeds. Unique adaptations include peltate leaves and a prominent seed-bearing receptacle that aid identification.