Cicuta, commonly known as water hemlock, is a small genus of four species of highly poisonous plants in the family Apiaceae.
 They are perennial herbaceous plants which grow up to 2.5 m tall, having distinctive small green or white flowers arranged in an umbrella shape (umbel).
 Plants in this genus may also be referred to as cowbane or poison parsnip.
 "Cicuta" is native to temperate regions of the Northern Hemisphere, mainly North America and Europe, typically growing in wet meadows, along streambanks and other wet and marshy areas.
 These plants bear a close resemblance to other members in the family Apiaceae and may be confused with a number of other edible and poisonous plants.
 The common name hemlock may also be confused with poison hemlock ("Conium maculatum").
Thuja ( ) is a genus of coniferous trees in the Cupressaceae (cypress family).
 There are five species in the genus, two native to North America and three native to eastern Asia.
 The genus is monophyletic and sister to "Thujopsis".
 Members are commonly known as arborvitaes, (from Latin for "tree of life") thujas or cedars.
Cucurbita (Latin for gourd) is a genus of herbaceous vines in the gourd family, Cucurbitaceae, also known as cucurbits, native to the Andes and Mesoamerica.
 Five species are grown worldwide for their edible fruit, variously known as squash, pumpkin, or gourd depending on species, variety, and local parlance, and for their seeds.
 First cultivated in the Americas before being brought to Europe by returning explorers after their discovery of the New World, plants in the genus "Cucurbita" are important sources of human food and oil.
 Other kinds of gourd, also called bottle-gourds, are native to Africa and belong to the genus "Lagenaria", which is in the same family and subfamily as "Cucurbita" but in a different tribe.
 These other gourds are used as utensils or vessels, and their young fruits are eaten much like those of Cucurbita species.
Cortusa is a genus that consists of 19 species of delicate, hardy, alpine perennials, relative to "Primula" both in general appearance and habit of growth.
 The genus is named by the herbalist Matthiolus after his friend Cortusus, professor of botany at Padua, who discovered the plant called today "Cortusa matthioli".
 The plants are flowering herbaceous perennials native to the mountains of southern and eastern Europe, including the Alps and the Carpathians, and some species native to China.
 Most of the species are small spring bloomers for shade and rock garden.
 These low-growing and rather handsome little plants have clumps of downy, light green, heart-shaped leaves with serrated edges.
 In late spring, small loose umbel of delicate bell-shaped to lily-liked flowers born terminally on drooping spikes arise from the base, some 6-8in high.
 Flowers are magenta, pink, white and yellow.
 They are dormant in some months, and as spring begins, stems and leaves quickly start to reproduce.
Thujopsis (pronounced ) is a conifer in the cypress family (Cupressaceae), the sole member of the genus being Thujopsis dolabrata.
 It is endemic to Japan, where it is named asunaro (あすなろ).
 It is similar to the closely related genus "Thuja" (Arborvitae), differing in the broader, thicker leaves and thick cones.
 It is also called hiba, false arborvitae, or hiba arborvitae.
Nymphaea is a genus of hardy and tender aquatic plants in the family Nymphaeaceae.
 The genus has a cosmopolitan distribution.
 Many species are cultivated as ornamental plants, and many cultivars have been bred.
 Some taxa occur as introduced species where they are not native, and some are weeds. Plants of the genus are known commonly as water lilies.
 The genus name is from the Greek νυμφαια, "nymphaia" and the Latin "nymphaea", which mean "water lily" and were inspired by the nymphs of Greek and Latin mythology.
Dipsacus is a genus of flowering plant in the family Caprifoliaceae.
 The members of this genus are known as teasel, teazel or teazle.
 The genus includes about 15 species of tall herbaceous biennial plants (rarely short-lived perennial plants) growing to 1 - tall.
 Dipsacus are native to Europe, Asia and northern Africa.
Apera is a small genus of annual grasses, known commonly as silkybent grass or windgrass.
 They are native to Europe, North Africa and parts of Asia but have been introduced and naturalized in much of North and South America.
United States Department of Agriculture Plants Profile
Cyrtandra is a genus of flowering plants containing about 600 species, with more being discovered often, and is thus the largest genus in the family Gesneriaceae.
 These plants are native to Southeast Asia, Australia, and the Pacific Islands, with the centre of diversity in Southeast Asia and the Malesian region.
 The genus is common, but many species within it are very rare, localized, endangered endemic plants.
 The species can be difficult to identify because they are highly polymorphic and because they readily hybridize with each other.
 The plants may be small herbs, vines, shrubs, epiphytes, or trees.
 The genus is characterized in part by having two stamens, and most species have white flowers, with a few red-, orange-, yellow- and pink-flowered species known.
 Almost all species live in rainforest habitats.
Calendula ( ), is a genus of about 15–20 species of annual and perennial herbaceous plants in the daisy family Asteraceae that are often known as marigolds.
 They are native to southwestern Asia, western Europe, Macaronesia, and the Mediterranean.
 Other plants are also known as marigolds, such as corn marigold, desert marigold, marsh marigold, and plants of the genus "Tagetes".

Question: Which genus of plants is native to Europe, Apera or Thujopsis dolabrata?
Answer: Apera