Question: Which genus is aquatic, Phylica or Nelumbo?
Context: Hygrophila, commonly known as swampweeds, is a genus of flowering plants in the acanthus family, Acanthaceae.  There are about 80 to 100 species, of which many are aquatic plants.  The genus is distributed across the tropical and subtropical world.  It is one of only two genera in its family that contains aquatic plants, the other being "Justicia".  The genus is treated in the tribe "Hygrophileae", which is noted as being in need of revision at the genus level, meaning the current taxonomic boundaries of "Hygrophila" are likely to change in the future. Nelumbonaceae, sometimes called the sacred lotus family, is a family of flowering plants, including the single genus "Nelumbo" with two species, "N. lutea" (North America) and "N. nucifera" (widespread in tropical Asia). Cylindrospermum is a genus of filamentous cyanobacteria found in terrestrial and aquatic environments.  In terrestrial ecosystems, "Cylindrospermum" is found in soils, and in aquatic ones, it commonly grows as part of the periphyton on aquatic plants.  The genus is heterocystous (nitrogen-fixing) cyanobacteria. Padma ("Nelumbo nucifera", the sacred lotus) is an aquatic plant that plays a central role in Indian religions such as Hinduism, Buddhism, Sikhism, and Jainism.  The lotus flower has many different names such as the "Indian Lotus", the "Sacred Lotus", and the "Bean of India". Nelumbo is a genus of aquatic plants with large, showy flowers. Members are commonly called lotus, though "lotus" is a name also applied to various other plants and plant groups, including the unrelated genus "Lotus".  Members outwardly resemble those in the family Nymphaeaceae ("water lilies"), but "Nelumbo" is actually very distant to Nymphaeaceae.  "Nelumbo" is derived from the Sinhalese word Sinhalese: නෙළුම් "neḷum", the name for the lotus "Nelumbo nucifera". Lotus seeds or lotus nuts are the seeds of plants in the genus "Nelumbo", particularly the species "Nelumbo nucifera".  The seeds are of great importance to East Asian cuisine and are used extensively in traditional Chinese and Indian medicine and in Chinese/Indian desserts.  The seeds are most commonly sold in the shelled and dried form.  Fresh lotus seeds are relatively uncommon in the market except in areas of lotus root and seed production (such as Upper and Central Sindh of Pakistan), where they are sometimes sold as a raw snack commonly called "Dodee".  Raw lotus seeds are low in saturated fat, cholesterol, and sodium, and are a good source of protein, thiamin, magnesium, phosphorus, potassium, and manganese. Laticauda or sea kraits are a genus of venomous elapid snakes from the subfamily Hydrophiinae.  They are semi-aquatic: they retain the wide ventral scales typical of terrestrial snakes for moving on land but also have paddle-shaped tails for swimming.  Sea kraits are often confused with another group of aquatic reptiles: sea snakes.  However, unlike the fully aquatic ovoviviparous sea snakes, sea kraits are oviparous and must come to land to digest prey and lay eggs.  They also have independent evolutionary origins into aquatic habitats, with sea kraits diverging earlier from other Australasian elapids.  Thus, sea kraits and sea snakes are an example of convergent evolution into aquatic habitats within Hydrophiinae snakes. Colocasia is a genus of flowering plants in the family Araceae, native to southeastern Asia and the Indian subcontinent.  Some species are widely cultivated and naturalized in other tropical and subtropical regions.  Common names include tarul, karkala ko ganu, elephant-ear, taro, cocoyam, dasheen, chembu, champadhumpa, shavige gadde, and eddoe.  Elephant-ear and cocoyam are also used for some other large-leaved genera in the Araceae, notably "Xanthosoma" and "Caladium".  The generic name is derived from the ancient Greek word "kolokasion", which in the Greek botanist Dioscorides (1st century AD) meant the edible roots of both "Colocasia esculenta" and "Nelumbo nucifera".  It is thought that the edible roots of "Colocasia esculenta" have been cultivated in Asia for more than ten thousand years.  The species "Colocasia esculenta" is an invasive species in wetlands along the American Gulf coast, where it threatens to displace native wetland plants. Phylica is a genus of plants in the family Rhamnaceae.  It contains about 150 species, the majority of which are restricted to South Africa, where they form part of the "fynbos ".  A few species occur in other parts of southern Africa, and on islands including Madagascar, the Mascarene Islands, Île Amsterdam, Saint Helena, Tristan da Cunha, and Gough Island. Nelumbo nucifera, also known as Indian lotus, sacred lotus, bean of India, Egyptian bean or simply lotus, is one of two extant species of aquatic plant in the family Nelumbonaceae.  The Linnaean binomial "Nelumbo nucifera" (Gaertn. ) is the currently recognized name for this species, which has been classified under the former names, "Nelumbium speciosum" (Willd. ) and "Nymphaea nelumbo", among others.  (These names are obsolete synonyms and should be avoided in current works.)  This plant is an aquatic perennial.  Under favorable circumstances its seeds may remain viable for many years, with the oldest recorded lotus germination being from that of seeds 1,300 years old recovered from a dry lakebed in northeastern China.
Answer: Nelumbo