Nymphoides crenata, commonly known as wavy marshwort, is an aquatic plant of the family Menyanthaceae native to eastern and northern Australia.
Syneilesis is a genus of East Asian plants in the groundsel tribe within the Asteraceae.
Hydrocleys nymphoides, the waterpoppy or water-poppy, is an aquatic plant species in the Alismataceae.
 It is widespread across South America, Central America, Puerto Rico, Trinidad and the Netherlands Antilles.
 It is cultivated in many places for used in decorative ponds and artificial aquatic habitats, and naturalized in Australia, New Zealand, South Africa, Fiji, New Caledonia, French Polynesia, Florida, Louisiana and Texas.
Nymphoides peltata (syn.
 "Villarsia nymphaeoides", fringed water-lily, yellow floatingheart, water fringe) is an aquatic plant of the family Menyanthaceae native to Eurasia.
 It has cordate floating leaves that support a lax inflorescence of yellow flowers with fringed petal margins.
 The fruit is a capsule bearing many flattened seeds with stiff marginal hairs.
Nymphoides, or floatingheart, is a genus of aquatic flowering plants in the family Menyanthaceae.
 The genus name refers to their resemblance to the water lily "Nymphaea".
 "Nymphoides" are aquatic plants with submerged roots and floating leaves that hold the small flowers above the water surface.
 Flowers are sympetalous, most often divided into five lobes (petals).
 The petals are either yellow or white, and may be adorned with lateral wings or covered in small hairs.
 The inflorescence consists of either an umbellate cluster of flowers or a lax raceme, with internodes occurring between generally paired flowers.
Menyanthaceae is a family of aquatic and wetland plants in the order Asterales.
 There are approximately 60-70 species in five genera distributed worldwide.
 The simple or compound leaves arise alternately from a creeping rhizome.
 In the submersed aquatic genus "Nymphoides", leaves are floating and support a lax, umbellate or racemose inflorescence.
 In other genera the inflorescence is erect and consists of one (e.g., "Liparophyllum") to many flowers.
 The sympetalous, insect-pollinated flowers are five-parted and either yellow or white.
 The petals are ciliate or adorned with lateral wings.
 Fruit type is a capsule.
Nymphoides indica is an aquatic plant in the Menyanthaceae, native to tropical areas around the world.
 It is sometimes cultivated, and has become a minor weed in Florida, where it resembles the native "Nymphoides aquatica".
 Common names include banana plant, robust marshwort, and water snowflake.
Nymphoides balakrishnanii is an aquatic plant in the Menyanthaceae, endemic to lateritic plateaus of the southern Western Ghats of India.
Diphlebia nymphoides is a species of Australian damselfly in the family Lestoideidae,
Nymphoides hydrophylla (crested floatingheart, white water snowflake, white snowflake ) is an aquatic plant of the family Menyanthaceae native to tropical Asia.
 It has cordate floating leaves that support a lax inflorescence of dainty white flowers with fringed petal margins.
 Its slim stem (spear) is edible, and is used as vegetable in Taiwan, mostly produced at Meinong District, Kaohsiung.

Question: Syneilesis and Nymphoides are both what?
Answer: genus