Question: Which is an aquatic plant, Pontederia or Heuchera?

full_context: Document 1: Giulio Pontedera: Giulio Pontedera (7 May 1688 – 3 September 1757) was an Italian botanist of Tuscan origin. He was professor of botany at Padua, and director of the botanical garden there. Although he rejected Carl Linnaeus' system, Linnaeus was a correspondent of Pontedera's, and named the genus "Pontederia" after him.
Document 2: Caulophyllum: Caulophyllum is a small genus of perennial herbs in the family Berberidaceae. It is native to eastern Asia and eastern North America. These plants are distinctive spring wildflowers, which grow in moist, rich woodland, it is known for its large triple-compound leaf, and large blue, berry-like fruits. Unlike many spring wildflowers, it is not an ephemeral plant and persists throughout much of the summer. Common names for plants in this genus include Blue Cohosh, Squaw Root, and Papoose Root. As hinted at by its common names, this plant is well known as an alternative medicine for inducing childbirth and menstrual flow; it is also considered a poisonous plant.
Document 3: Pistia: Pistia is a genus of aquatic plant in the arum family, Araceae. The single species it comprises, Pistia stratiotes, is often called water cabbage, water lettuce, Nile cabbage, or shellflower. Its native distribution is uncertain, but probably pantropical; it was first discovered from the Nile near Lake Victoria in Africa. It is now present, either naturally or through human introduction, in nearly all tropical and subtropical fresh waterways. The genus name is derived from the Greek word πιστός ("pistos"), meaning "water," and refers to the aquatic nature of the plants.
Document 4: × Heucherella: × "Heucherella" is an evergreen perennial flowering plant in the family Saxifragaceae. A hybrid of garden origin, it is the result of a cross between two distinct genera, "Heuchera" and "Tiarella", and shows similarities to both parents. This type of intergeneric hybrid is quite rare, and is indicated by a multiplication symbol before the name. The name "Heucherella" is an example of a portmanteau word, a combination of the two parents' names.
Document 5: Alum root: Alum root or Alumroot is a common name for some species of two different genera of flowering plants:
Document 6: Alternanthera philoxeroides: Alternanthera philoxeroides, commonly referred to as alligator weed, is a native species to the temperate regions of South America, which includes Argentina, Brazil, Paraguay and Uruguay. Argentina alone, hosts around 27 species that fall within the range of the genus Alternanthera. Its geographic range once used to cover only the Parana River region of South America, but it has since expanded to cover over 30 countries, such as the United States, New Zealand, China and many more. This invasive species is believed to have been accidentally introduced to these non-native regions through sediments trapped/attached to tanks and cargo of ships travelling from South America to these various areas.
Document 7: Pontederia cordata: Pontederia cordata, common name pickerelweed (USA) or pickerel weed (UK), is a monocotyledonous aquatic plant native to the American continent. It grows in a variety of wetlands, including pond and lake margins across an extremely large range from eastern Canada south to Argentina. A few examples include northern rivers, the Everglades and Louisiana.
Document 8: Sparganium natans: Sparganium natans is a species of bur-reed known by the common names least bur-reed and small bur-reed. It is a water plant native to high elevation lakes and marshes of Canada and the northern United States. It is usually found submersed in shallow, calm water. This bur-reed has thin, flexible, grasslike leaves which float in the water. Plants that spend more time out of water at the waterline are tougher and have shorter leaves. The plant bears two inflorescences, the staminate type being a rounded white filamentous ball and the pistillate type a sphere of thick, green, pointy peduncles. The fruits are small green or brown achenes.
Document 9: Pontederia: Pontederia is a genus of tristylous aquatic plants, members of which are commonly known as pickerel weeds. "Pontederia" is endemic to the Americas, distributed from Canada to Argentina, where it is found in shallow water or on mud. The genus was named by Linnaeus in honour of the Italian botanist Giulio Pontedera.
Document 10: Hellebore: Commonly known as hellebores , the Eurasian genus Helleborus consists of approximately 20 species of herbaceous or evergreen perennial flowering plants in the family Ranunculaceae, within which it gave its name to the tribe of Helleboreae. The scientific name "Helleborus" derives from the Greek name for "H. orientalis", ἑλλέβορος "helléboros", from "elein" "to injure" and βορά "borá" "food". Many species are poisonous. Despite names such as "winter rose", "Christmas rose" and "Lenten rose", hellebores are not closely related to the rose family (Rosaceae).
Document 11: Erica: Erica is a genus of roughly 860 species of flowering plants in the family Ericaceae. The English common names "heath" and "heather" are shared by some closely related genera of similar appearance. The genus "Calluna" was formerly included in "Erica" – it differs in having even smaller scale-leaves (less than 2–3 mm long), and the flower corolla consisting of separate petals. "Erica" is sometimes referred to as "winter (or spring) heather" to distinguish it from "Calluna" "summer (or autumn) heather".
Document 12: Ericaceae: The Ericaceae are a family of flowering plants, commonly known as the heath or heather family, found most commonly in acid and infertile growing conditions. The family is large, with c. 4250 known species spread across 124 genera, making it the 14th most species-rich family of flowering plants. The many well-known and economically important members of the Ericaceae include the cranberry, blueberry, huckleberry, rhododendron (including azaleas), and various common heaths and heathers ("Erica", "Cassiope", "Daboecia", and "Calluna" for example).
Document 13: Heuchera: Heuchera is a genus of evergreen, herbaceous perennial plants in the family Saxifragaceae, all native to North America. Common names include alumroot and coral bells.
Document 14: Hepatica: Hepatica (hepatica, liverleaf, or liverwort) is a genus of herbaceous perennials in the buttercup family, native to central and northern Europe, Asia and eastern North America. Some botanists include "Hepatica" within a wider interpretation of "Anemone".
Document 15: Lemna trisulca: Lemna trisulca L. (syn. "Staurogeton trisulcus" (L.) Schur; star duckweed; ivy-leaved duckweed) is a species of aquatic plants in the genus "Lemna" (duckweed) with a subcosmopolitan distribution, occurring in quiet freshwater habitats in cool temperate regions. "L. trisulca" normally doesn't occur in warm temperate regions. Unlike other duckweeds, it has submersed rather than floating fronds, except when flowering or fruiting.
ground_truth: Pontederia