1. Cosmopolitan except South America and New Zealand and some oceanic islands
   - water flaxseed, Spirodela polyrrhiza

Derived forms: great duckweeds

Type of: duckweed

Part of: genus Spirodela, Spirodela

• heliac
• heliacal
• Heliamphora
• helianthemum
• Helianthemum canadense
• Helianthemum scoparium
• helianthus
• Helianthus angustifolius
• Helianthus annuus
• Helianthus giganteus
• Helianthus laetiflorus
• Helianthus maximilianii
• Helianthus petiolaris
• Helianthus tuberosus
• helical
• Helichrysum
• Helichrysum bracteatum
• Helichrysum secundiflorum
• Helicidae
• helicoid
• helicon
• helicopter
• helicopter view
• Helicteres
• Helicteres isora