Question: Are Cephalaria and Sagina both a genus of species of flowering plants?

full_context: Document 1: Cephalaria: Cephalaria is a genus of about 65 species of flowering plants in the family Caprifoliaceae, native to southern Europe, western and central Asia, and northern and southern Africa.
Document 2: Sagina: Sagina (like "Colobanthus" called "pearlworts") is a genus of 20–30 species of flowering plants in the pink or carnation family, Caryophyllaceae. These are flowering herbs native to temperate regions of the Northern Hemisphere extending south to tropical mountain areas at high altitudes, reaching just south of the equator in Africa. They are small annual or perennial herbaceous plants, growing to 5–15 cm. The leaves are opposite, often in tight whorl-like clusters, simple linear, typically 5–20 mm long. The flowers are solitary or in small cymes, with four or five green sepals and an equal number of white petals; the petal size relative to the sepal size is useful in species identification. The fruit is a small capsule containing several seeds.
Document 3: Centaurea: Centaurea ( ) is a genus of between 350 and 600 species of herbaceous thistle-like flowering plants in the family Asteraceae. Members of the genus are found only north of the equator, mostly in the Eastern Hemisphere; the Middle East and surrounding regions are particularly species-rich. Common names for this genus are centaury, centory, starthistles, knapweeds, centaureas and the more ambiguous "bluets"; a vernacular name used for these plants in parts of England is "loggerheads" (common knapweed). The "Plectocephalus" group – possibly a distinct genus – is known as basketflowers. "Cornflowers" is used for a few species, but that term more often specifically means "C. cyanus" (sometimes also called "basket flower"). The common name "centaury" is sometimes used, although this also refers to the unrelated plant genus "Centaurium".
Document 4: Cephalaria leucantha: Cephalaria leucantha is a species of flowering plants in the family Caprifoliaceae.
Document 5: Phygelius: Phygelius, common names Cape fuchsia or Cape figwort, is a genus of flowering plants in the Scrophulariaceae family, native to wet slopes and banks in southern Africa. They are evergreen shrubs often treated as perennials in colder climates. They bear many pendent tubular flowers over a long period in summer, in shades of white, yellow and red. The vague similarity of the blooms to fuchsias has led to the common name Cape fuchsia, though they are not closely related.
Document 6: Valeriana: Valeriana is a genus of flowering plants in the family Caprifoliaceae, members of which may by commonly known as valerians. It contains many species, including the garden valerian, "Valeriana officinalis". Some species are native to Europe, others to North America and South America (especially in the Andes).
Document 7: Campanula garganica: Campanula garganica (Adriatic bellflower), syn. "C. elatines" var. "garganica", is a species of flowering plant in the genus "Campanula" of the family Campanulaceae, native to Southern Europe. It is a small, spreading herbaceous perennial growing to 5 cm . Basal rosettes of leaves bear a profusion of star-shaped blue flowers in summer.
Document 8: Globularia: Globularia is a genus of about 22 species of flowering plants in the family Plantaginaceae, native to central and southern Europe, Macaronesia, northwest Africa and southwest Asia. They are dense low evergreen mat-forming perennials or subshrubs, with leathery oval leaves 1–10 cm long. The flowers are produced in dense inflorescences (capitula) held above the plant on a 1–30 cm tall stem; the capitula is 1–3 cm in diameter, with numerous tightly packed purple, violet, pink or white flowers.
Document 9: Epigaea: Epigaea is a genus comprising three species of flowering plants in the Ericaceae. The species are small creeping shrubs that are typically anywhere from 10 to tall at full growth, forming large patches. The leaves are evergreen, alternate and simple, ranging amongst the three species from 2 to long. The flowers are small, white or pink, with a five-lobed tubular corolla which is produced in mid-spring. The fruit is a dry capsule with numerous small seeds.
Document 10: Lewisia pygmaea: Lewisia pygmaea is a species of flowering plant in the Montiaceae family known by the common name alpine lewisia and pygmy bitterroot. It is native to western North America from Alaska and Alberta to California and New Mexico, where it grows in many types of moist, rocky mountain habitat, such as gravel beds and sandy meadows. This is a highly variable species with a wide distribution, and it often hybridizes with other "Lewisia" species, making identification difficult. In general, this is a petite perennial herb growing from a taproot and caudex unit, and producing a basal rosette of several leaves 2 to 8 centimeters long. The leaves are narrow but thick and fleshy, blunt-tipped, and linear to lance-shaped. The inflorescence is usually made up of a few very short stems each bearing one or more flowers which appear to be sitting on or within the basal leaf rosette. Each flower has 5 to 9 white, pink or red petals which may or may not have dark veining or striping. The petals are 4 millimeters to 1 centimeter long.
Document 11: Colobanthus: Colobanthus is a large genus of small, cushion-like herbaceous plants, sometimes known as "pearlworts", a name they share with plants of the related genus "Sagina". "C. quitensis" is the world's southernmost dicot, and one of only two original flowering plants of Antarctica.
Document 12: Sagina: Sagina (like "Colobanthus" called "pearlworts") is a genus of 20–30 species of flowering plants in the pink or carnation family, Caryophyllaceae. These are flowering herbs native to temperate regions of the Northern Hemisphere extending south to tropical mountain areas at high altitudes, reaching just south of the equator in Africa. They are small annual or perennial herbaceous plants, growing to 5–15 cm. The leaves are opposite, often in tight whorl-like clusters, simple linear, typically 5–20 mm long. The flowers are solitary or in small cymes, with four or five green sepals and an equal number of white petals; the petal size relative to the sepal size is useful in species identification. The fruit is a small capsule containing several seeds.
Document 13: Anaphalis: Anaphalis is a genus of herbaceous and woody flowering plants within the Asteraceae family, whose members are commonly known by the name pearl or pearly everlasting. There are around 110 species with the vast majority being native to central and southern Asia. There is one species native to North America that is fairly well known and popular in cultivation, namely the western pearly everlasting ("Anaphalis margaritacea").
Document 14: Silene menziesii: Silene menziesii is a species of flowering plant in the pink family known by the common names Menzies' campion and Menzies' catchfly. It is native to western North America from Alaska through the western half of Canada to the southwestern United States. It can be found in many types of habitat and it is quite common in much of its range. It is variable in morphology and there are a number of varied subtaxa. In general, it is a perennial herb growing from a caudex, appearing matlike, decumbent, or erect, with stems a few centimeters to over half a meter long. It is usually hairy in texture, with upper parts bearing sticky glandular hairs. The leaves are lance-shaped, oppositely arranged in pairs, and a few centimeters in length, upper leaves usually smaller than lower. Flowers may occur in a cyme at the top of the stem, or in leaf axils, or both. Each is encapsulated in a hairy, veined calyx of fused sepals. The petals are white with two lobes at the tips. The plant is dioecious with male and female plants producing different flowers. The male and female flower types look the same externally; the stamens are reduced in female plants and the stigmas are reduced in the male.
Document 15: Ceropegia: Ceropegia is a genus of plants within the family Apocynaceae, native to Africa, southern Asia, and Australia. It was named by Carl Linnaeus, who first described this genus in volume 1 of his "Species plantarum", which appeared in 1753. Linnaeus thought that the flowers looked like a fountain of wax. From this the scientific name was derived: ‘"keros"’ meaning wax and ‘"pege"’ meaning fountain (Pooley, 1998). They have many common names including lantern flower, parasol flower, parachute flower, bushman’s pipe, string of hearts, snake creeper, wine-glass vine, rosary vine, and necklace vine.
ground_truth: yes