Horkelia is a genus of plants in the rose family.
 It includes several species of plants known commonly as horkelias.
 These are flowering plants closely related to the cinquefoils ("Potentilla") and sometimes considered part of the same genus.
 There are nineteen species found in western North America, especially California.
 "Horkelia" was named for German scientist Johann Horkel.
Carduus is a genus of flowering plants in the aster family, Asteraceae, and the tribe Cynareae, one of two genera considered to be true thistles, the other being "Cirsium".
 Plants of the genus are known commonly as plumeless thistles.
 They are native to Eurasia and Africa, and several are known elsewhere as introduced species.
 This genus is noted for its disproportionately high number of noxious weeds compared to other flowering plant genera.
Anthecology, or pollination biology, is the study of pollination as well as the relationships between flowers and their pollinators.
 Floral biology is a bigger field that includes these studies.
 Most flowering plants, or angiosperms, are pollinated by animals, and especially by insects.
 The major flower-frequenting insect taxa include beetles, flies, wasps, bees, ants, thrips, butterflies, and moths.
 Insects carry out pollination when visiting flowers to obtain nectar or pollen, to prey on other species, or when pseudo-copulating with insect-mimicking flowers such as orchids.
 Pollination-related interactions between plants and insects are considered mutualistic, and the relationships between plants and their pollinators have likely led to increased diversity of both angiosperms and the animals that pollinate them.
Prinsepia is a genus of trees in the Rosaceae.
 It bears fruit which looks like a cherry.
 The various species grow largely in Nepal, India, China, Bangladesh, and Taiwan, though "P. sinensis" is hardy in zone 4, to about -32*C.
Trilliaceae is the botanical name of a family of flowering plants.
 The family has been recognised as distinct since 1846 when it was recognized; this table  for a summarizes the placement of these taxa.
 The family has been recognized by taxonomists such as Takhtajan, Dahlgren, Thorne, and Watson & Dallwitz; other taxonomists have considered these plants to belong to the family Liliaceae.
 The APG II system, of 2003 (unchanged from the APG system, of 1998), does not recognize such a family either and assigns the plants involved to family Melanthiaceae.
 One problem with this recognition is the lack of morphological synapomorphies for the family Melanthiaceae; this chart  provides a summary of the characters in each of the major groups.
Ravenala is a genus of flowering plants with a single species, Ravenala madagascariensis, commonly known as traveller's tree or traveller's palm, from Madagascar.
 It is not a true palm (family Arecaceae) but a member of a monocotyledonous flowering plant family, Strelitziaceae.
 The genus is closely related to the southern African genus "Strelitzia" and the South American genus "Phenakospermum".
 Some older classifications include these genera in the banana family (Musaceae).
 Although it is usually considered to be a single species, four different forms have been distinguished.
The eudicots, Eudicotidae or eudicotyledons are a monophyletic clade of flowering plants that had been called tricolpates or non-magnoliid dicots by previous authors.
 The botanical terms were introduced in 1991 by evolutionary botanist James A. Doyle and paleobotanist Carol L. Hotton to emphasize the later evolutionary divergence of tricolpate dicots from earlier, less specialized, dicots.
 The close relationships among flowering plants with tricolpate pollen grains was initially seen in morphological studies of shared derived characters.
 These plants have a distinct trait in their pollen grains of exhibiting three colpi or grooves paralleling the polar axis.
 Later molecular evidence confirmed the genetic basis for the evolutionary relationships among flowering plants with tricolpate pollen grains and dicotyledonous traits.
 The term means "true dicotyledons", as it contains the majority of plants that have been considered dicots and have characteristics of the dicots.
 The term "eudicots" has subsequently been widely adopted in botany to refer to one of the two largest clades of angiosperms (constituting over 70% of the angiosperm species), monocots being the other.
 The remaining angiosperms include magnoliids and what are sometimes referred to as basal angiosperms or paleodicots, but these terms have not been widely or consistently adopted, as they do not refer to a monophyletic group.
The Lloydieae were a tribe of monocotyledon perennial, herbaceous mainly bulbous flowering plants in the Liliaceae (Lily) family.
 The tribe was generally considered monogeric, being represented by the single genus "Lloydia".
 But since that genus has at various times and is now considered to be part of the genus "Gagea", and therefore in the "Lilieae" tribe, it was sometimes listed with both genera.
 Furthermore many authorities place "Gagea" into a separate tribe, Tulipeae.
 It has also historically been considered to be a subtribe of the Lilieae.
 In 2013, Kim "et al." proposed splitting off "Gagea" from the rest of Tulipeae by resurrecting the tribe Lloydieae.
Canarina is a genus of flowering plants within the family Campanulaceae.
 They are herbaceous perennial vines with bell-shaped flowers.
 The best known species is "C. canariensis" from the laurel forests of the Canary Islands which is grown as an ornamental plant.
 "Canarina canariensis" is one of a group of unrelated Canarian plants that appear to be adapted for bird pollination, including the members of the genera "Isoplexis" and "Lotus".
 It was once thought that the original pollinators of these plants were sunbirds which had become extinct on the Canary Islands, explaining why some of these species are rare and considered endangered (Vogel 1954; Vogel et al. 1984; Olesen 1985; Valido et al. 2004).
 However more recent work has shown that these plants are adequately pollinated by non-specialist flower visiting birds, particularly the Canary Islands chiffchaff ("Phylloscopus canariensis") and the Canary Island spectacled warbler ("Sylvia conspicillata orbitalis") (Olesen 1985; Ollerton et al. 2008), and in fact show some specific adaptations to infrequent pollination by these birds, such as extended flower lifespans (Ollerton et al. 2008), and a hexose-dominated sugar ratio of the nectar (Dupont et al. 2004).
Erinacea is a small genus of flowering plant in the legume family Fabaceae.

Question: Are both Erinacea and Prinsepia considered flowering plants?
Answer: no