Question: are Cladanthus and Oxydendrum both plant genus ?

Context articles: Phyllanthus
Oxydendrum
Ipheion
Hesperelaea
Acanthopale
Cladanthus
Aldrovanda vesiculosa
Banksia sessilis
Dorstenia
Falconeria

Phyllanthus is the largest genus in the flowering plant family Phyllanthaceae.
 Estimates of the number species in this genus vary widely, from 750 to 1200.
 "Phyllanthus" has a remarkable diversity of growth forms including annual and perennial herbs, shrubs, climbers, floating aquatics, and pachycaulous succulents.
 Some have flattened leaflike stems called cladodes.
 It has a wide variety of floral morphologies and chromosome numbers and has one of the widest range of pollen types of any seed plant genus.
Sourwood or sorrel tree, Oxydendrum arboreum, is the sole species in the genus Oxydendrum, in the family Ericaceae.
 It is native to eastern North America, from southern Pennsylvania south to northwest Florida and west to southern Illinois; it is most common in the lower chain of the Appalachian Mountains.
 The tree is frequently seen as a component of oak-heath forests.
The flowering plant genus Ipheion (starflower, spring starflower) belongs to Allioideae subfamily of the Amaryllidaceae family.
 The World Checklist of Selected Plant Families no longer recognize the genus, regarding it as a synonym of "Tristagma", although The Plant List accepts two species.
Hesperelaea is a plant genus with only one species, probably now extinct.
 Hesperelaea palmeri was found only on Guadalupe Island, a small island in the Pacific Ocean, part of the Mexican state of Baja California, about 400 km southwest of Ensenada.
 The last collection of the plant on the island was in 1875, so the species and the genus must now be presumed extinct.
 An intensive search for the plant in 2000 was unsuccessful.
Acanthopale is a plant genus in the Acanthaceae plant family.
 The genus name is based on the classic Greek words for thorn "ákantha" and stake "palum".
 Some species in the genus are cultivated as ornamental plants.
Cladanthus is a genus of plants in the family sunflower family, native to the Mediterranean region.
Aldrovanda vesiculosa, commonly known as the waterwheel plant, is the sole extant species in the flowering plant genus "Aldrovanda" of the family Droseraceae.
 The plant captures small aquatic invertebrates using traps similar to those of the Venus flytrap.
 The traps are arranged in whorls around a central, free-floating stem, giving rise to the common name.
 This is one of the few plant species capable of rapid movement.
Banksia sessilis, commonly known as parrot bush, is a species of shrub or tree in the plant genus "Banksia" in the family Proteaceae.
 It had been known as Dryandra sessilis until 2007, when the genus "Dryandra" was sunk into "Banksia".
 The Noongar peoples know the plant as Budjan or Butyak.
 Widespread throughout southwest Western Australia, it is found on sandy soils over laterite or limestone, often as an understorey plant in open forest, woodland or shrubland.
 Encountered as a shrub or small tree up to 6 m in height, it has prickly dark green leaves and dome-shaped cream-yellow flowerheads.
 Flowering from winter through to late spring, it provides a key source of food—both the nectar and the insects it attracts—for honeyeaters in the cooler months, and species diversity is reduced in areas where there is little or no parrot bush occurring.
 Several species of honeyeater, some species of native bee, and the European honey bee seek out and consume the nectar, while the long-billed black cockatoo and Australian ringneck eat the seed.
 The life cycle of "Banksia sessilis" is adapted to regular bushfires.
 Killed by fire and regenerating by seed afterwards, each shrub generally produces many flowerheads and a massive amount of seed.
 It can recolonise disturbed areas, and may grow in thickets.
Dorstenia is a predominately Old and New World plant genus within the family Moraceae, but there is one "Dorstenia" species that is located in Indonesia and South Asia.
 There are 105 species within this genus that are fairly equally distributed between the Afrotropics and Neotropics, second only in number to the "Ficus" genera in Moraceae, but "Dorstenia" is unique when compared to other members of the Moraceae because of their extremely diverse growth habits and life forms.
 The majority of the Moraceae is woody perennials, while "Dorstenia" is dominated by herbaceous, succulent, or suffrutescent perennials, and only 10% exhibit the typical woody habit of the Moraceae.
 "Dorstenia" also have a striking reproductive structure composed of clusters of bisexual flowers on disc-shaped receptacles that are often adorned with variable size and shape bracts.
 Like most members of the Moraceae, "Dorstenia" have drupe fruits like peaches (peaches are not a member of the Moraceae), but another special feature of "Dorstenia" drupes is that they explode to release the seed.
 The seeds are usually small with a minuscule endosperm.
 The "Dorstenia" genus is also well known by indigenous people in the tropics as a medicinal plant with numerous flavonoid compounds that have anti-microbial, anti-reverse transcriptase, and anti-inflammatory effects.
Falconeria is a monotypic plant genus in the family Euphorbiaceae, first described as a genus in 1839.
 The genus is sometimes included within the genus "Sapium".
 The sole species is Falconeria insignis.
 The plant is found from India, Nepal, Bangladesh, and Sri Lanka to Indochina, China (Hainan, Sichuan, Yunnan), Thailand and Peninsular Malaysia.