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Wolffiella oblonga (Phil.) Hegelm.

Introduction & Overview

Common and Scientific Names

  • Scientific Name: Wolffiella oblonga
  • Common Name: Oblong wolffiella or oblong duckweed

Quick Facts

  • Origin: Native to freshwater habitats
  • Features: Recognized for its tiny, oblong, bright-green fronds and swift clonal propagation. Its unassuming appearance belies a fascinating biology that supports diverse aquatic ecosystems

Taxonomy & Classification

  • Genus: Wolffiella
  • Botanical Background: Originally described by early botanists such as Philippi and later refined by Hegelmaier, the species has been studied for its evolutionary adaptations to aquatic environments. Modern research by institutions like the International Aroid Society continues to shed light on its taxonomic relationships.

Natural Habitat & Distribution

  • Geographical Range: Found in freshwater bodies across temperate and subtropical regions, where it typically populates ponds, lakes, and slow-moving streams.
  • Environment: Thrives in clear, still or gently flowing water with abundant sunlight. It favors soft, nutrient-rich substrates and consistently high humidity levels within its aquatic surroundings.

Morphological Characteristics

Leaves

  • Displays small, oblong, bright-green fronds that are smooth in texture
  • Structures carry out photosynthesis and contribute to the plant’s compact form

Inflorescence (Spadix & Spathe)

  • Flowering is infrequent and the inflorescences are inconspicuous
  • A reduced spadix and spathe that are typically self-pollinating under optimal conditions

Growth Habit

  • Free-floating aquatic plant that reproduces rapidly via vegetative budding, forming dense mats on the water’s surface without the development of significant rhizomes

Cultivation & Care

Light Requirements

  • Benefits from bright, indirect light or full sun when placed in outdoor ponds or aquariums

Watering & Humidity

  • Must remain submerged in clean, well-oxygenated water
  • Regular water changes help maintain optimal humidity and nutrient balance

Soil & Potting Mix

  • Typically grown directly in water, it does not require a traditional potting mix
  • Aquatic substrate may be used to anchor colonies if desired

Temperature & Fertilizer

  • Thrives in moderate water temperatures between 18°C and 28°C
  • Occasional applications of a diluted aquatic fertilizer can support its growth during extended cultivation

Propagation Methods

Division & Stem Cuttings

  • Propagation occurs primarily through vegetative budding
  • Dividing established colonies is the most common method to expand its presence in a water garden or research setting


Seeds

  • Rarely observed and plays a minor role in the plant’s natural propagation

Common Pests & Diseases

Typical Issues

  • Stagnant water may encourage fungal infections or the growth of algae and water molds

Treatment Recommendations

  • Ensuring proper water circulation and regular cleaning of cultivation areas usually prevents issues
  • In cases of infection, safe, diluted organic treatments are preferred over chemical interventions

Notable Traits & Uses

  • Contributes to aquatic ecosystems by providing shelter for microfauna and aiding in water purification
  • Contributes to aquatic ecosystems by providing shelter for microfauna and aiding in water purification
  • Its minimalist, natural aesthetic and its ability to quickly cover water surfaces, making it a favorite in aquascaping and small pond installations

Conservation & Availability

Wild Population Status

  • No major conservation concerns
  • It is considered locally abundant in suitable habitat

Market Availability

  • Widely available for aquatic gardening and research purposes

References & Resources

Further Reading

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