Question: Dieffenbachia and Tibouchina, are which kind of plants?

Context paragraphs:
Tibouchina: Tibouchina Aubl.  is a Neotropical flowering plant genus in Melastomataceae Juss.  that contains approximately 240 species.  Species of this genus are herbs, shrubs or trees and typically have purple flowers.  They are native to Mexico, the Caribbean, and South America where they are found as far south as northern Argentina.  Members of this genus are known as glory bushes, glory trees or princess flowers.  The name "Tibouchina" is adapted from a Guianan indigenous name for a member of this genus .  A recent systematic study has shown that this genus is paraphyletic.

Fen: A fen is one of the main types of wetland, the others being grassy marshes, forested swamps, and peaty bogs. Along with bogs, fens are a kind of mire.  Fens are minerotrophic peatlands, usually fed by mineral-rich surface water or groundwater.  They are characterised by their distinct water chemistry, which is pH neutral or alkaline, with relatively high dissolved mineral levels but few other plant nutrients.  They are usually dominated by grasses and sedges, and typically have brown mosses in general including "Scorpidium" or "Drepanocladus".  Fens frequently have a high diversity of other plant species including carnivorous plants such as "Pinguicula".  They may also occur along large lakes and rivers where seasonal changes in water level maintain wet soils with few woody plants.  The distribution of individual species of fen plants is often closely connected to water regimes and nutrient concentrations.

Melon: A melon is any of various plants of the family Cucurbitaceae with sweet edible, fleshy fruit.  The word "melon" can refer to either the plant or specifically to the fruit.  Botanically, a melon is a kind of berry, specifically a "pepo".  The word "melon" derives from Latin "melopepo ", which is the latinization of the Greek μηλοπέπων ("mēlopepōn"), meaning "melon", itself a compound of μῆλον ("mēlon"), "apple, treefruit ("of any kind")" and πέπων ("pepōn"), amongst others "a kind of gourd or melon".  Many different cultivars have been produced, particularly of cantaloupes.

Exophora: In linguistic pragmatics, exophora is reference to something extralinguistic, i.e. not in the same text, and contrasts with endophora.  Exophora can be deictic, in which special words or grammatical markings are used to make reference to something in the context of the utterance or speaker.  For example, pronouns are often exophoric, with words such as "this", "that", "here", "there", as in "that chair over there is John's" said while indicating the direction of the chair referred to.  Given "Did the gardener water those plants?" , it is quite possible that "those" refers back to the preceding text, to some earlier mention of those particular plants in the discussion.  But it is also possible that it refers to the environment in which the dialogue is taking place — to the "context of situation", as it is called — where the plants in question are present and can be pointed to if necessary.  The interpretation would be "those plants there, in front of us".  This kind of reference is called exophora, since it takes us outside the text altogether.  Exophoric reference is not cohesive, since it does not bind the two elements together into a text.

American Gothic: American Gothic is a painting by Grant Wood in the collection of the Art Institute of Chicago.  Wood's inspiration came from what is now known as the American Gothic House, and his decision to paint the house along with "the kind of people I fancied should live in that house."  Created in 1930, it depicts a farmer standing beside a woman that has been interpreted to be his daughter or wife.  The figures were modeled by Wood's sister, Nan Wood Graham, and Wood and Graham's dentist, Dr. Byron McKeeby.  The woman is dressed in a colonial print apron evoking 19th-century Americana, and the man is holding a pitchfork.  The plants on the porch of the house are mother-in-law's tongue and beefsteak begonia, which are the same plants as in Wood's 1929 portrait of his mother, "Woman with Plants".

Bognera: Bognera is a monotypic genus of flowering plants in the Araceae family.  The single species that makes up the genus is Bognera recondita.  The word "recondita" means "hidden" referring to the fact that the plant is only found in remote areas of Amazonian Brazil near the Peruvian border.  The species was discovered in the late 1970s and was originally placed in the genus "Ulearum".  In 1984 a new genus, "Bognera" named after the German Aroid specialist Josef Bogner, was created for it.  "Bognera" is believed to be closely related to "Dieffenbachia".

Nimbahera stone: Nimbahera stone is a kind of limestone which is found near Nimbahera city in the Chittorgarh district of Rajasthan, India.  It is blue in colour and inferior to Kota Stone.  It is used as major raw material in cement plants; in fact, there are a lot of cement plants in Chittorgarh district and specially in Nimbahera because of the stone's availability in the region.

Dieffenbachia: Dieffenbachia is a genus of tropical flowering plants in the family Araceae.  It is native to the New World Tropics from Mexico and the West Indies south to Argentina.  Some species are widely cultivated as ornamental plants, especially as houseplants, and have become naturalized on a few tropical islands.

Plantago: Plantago is a genus of about 200 species of small, inconspicuous plants commonly called plantains or fleaworts.  The common name plantain is shared with the unrelated cooking plantain, a kind of banana.  Most are herbaceous plants, though a few are subshrubs growing to 60 cm tall.

Cultigen: A cultigen (from the Latin "cultus" – cultivated, and "gens" – kind) is a plant that has been deliberately altered or selected by humans; it is the result of artificial selection.  These "man-made" or anthropogenic plants are, for the most part, plants with commercial value used in horticulture, agriculture or forestry.  Because cultigens are defined by their mode of origin and not by where they are growing, plants meeting this definition remain cultigens whether they are naturalised in the wild, deliberately planted in the wild, or growing in cultivation.

Supporting paragraphs: Dieffenbachia Tibouchina
Answer: flowering