Question: Which genus, Callianthemum or Chamaemelum, is native to more continents?

full_context: Document 1: Deinanthe: Deinanthe is a genus consisting of a few species of rare herbaceous-habit rhizomatous plants found in the mountain woodlands of East Asia, ranging from China to Japan. They are handsome clump-forming perennials good for shade, woodland and rock gardens. These attractive deciduous plants have relatively large "fishtail" leaves (cleft at the apex). Deinanthes grow at a slow rate to be bushy and shrub-like, 2ft tall and wide. The leaves attain 3 to 4 inches in length,being deep green, roughly textured, deep veined, cordate at their bases and with serrate margins. The shoots emerge from stout, knobby rhizomes. Leaves are easily damaged in direct sun exposure. Flowering occurs in late summer to early fall. The delicate, waxy, nodding cup-shaped flowers in rich to pale purple-blue, rose or white, are borne in loose terminal clusters. Resembling gargantuan fertile hydrangea flowers, with numerous yellowish to pale blue anthers, they are occasionally accompanied by sterile flowers, as in the lacecap hydrangeas. Roots and leaves are edible.
Document 2: Pulsatilla vernalis: Pulsatilla vernalis (spring pasqueflower, arctic violet, lady of the snows) is a species of flowering plant in the family Ranunculaceae, native to mountainous habitats in Europe. Growing to 10 cm high and wide, it is a semi-evergreen perennial with hairy, divided leaves. In early spring it bears anemone-like flowers which are up to 6 cm in diameter, white flushed with violet on the outer surface of the petals, and prominent yellow stamens.
Document 3: Calendula arvensis: Calendula arvensis is a species of flowering plant in the daisy family known by the common name field marigold. It is native to central and southern Europe, and it is known across the globe as an introduced species.
Document 4: Cyclamen rhodium: Cyclamen rhodium (also called "Cyclamen peloponnesiacum"; once included in "Cyclamen repandum") is a species of flowering plant in genus "Cyclamen" of the family Primulaceae, native to the Peloponnese, Rhodes, and southwestern Kos. It is a tuberous perennial growing to 10 cm , with mottled, heart-shaped leaves and pink flowers, darker carmine pink at the base, appearing in spring. Like all cyclamens, the flowers consist of five upswept, reflexed petals.
Document 5: Cyclamen: Cyclamen ( or ) is a genus of 23 species of perennial flowering plants in the family Primulaceae. Cyclamen species are native to Europe and the Mediterranean Basin east to Iran, with one species in Somalia. They grow from tubers and are valued for their flowers with upswept petals and variably patterned leaves.
Document 6: Rhodanthemum: Rhodanthemum syn. "Chrysanthemopsis", "Pyrethropsis" (Moroccan daisy), is a genus of flowering plants in the family Asteraceae, mostly native to exposed rocky places in Northern Africa (Morocco and Algeria). Formerly included in either "Chrysanthemum" or "Leucanthemum", the 10 or 15 species of "Rhodanthemum" display many similarities to their former parents, with composite daisy-like flowers. They are mat-forming, prostrate perennials or subshrubs, and some are cultivated as ornamental plants.
Document 7: Matricaria discoidea: Matricaria discoidea, commonly known as pineappleweed, wild chamomile, and disc mayweed is an annual plant native to North America and Northeast Asia but which has become a cosmopolitan weed. It is in the family Asteraceae. The flowers exude a chamomile/pineapple aroma when crushed. They are edible and have been used in salads (although they may become bitter by the time the plant blooms) and to make herbal tea. Pineapple weed has been used for medicinal purposes, including for relief of gastrointestinal upset, infected sores, fevers, and postpartum anemia.
Document 8: Chamaemelum: Chamaemelum is a small genus of plants in the daisy family commonly known as chamomiles or dogfennels. Perhaps the best-known species is Roman chamomile, "Chamaemelum nobile". These are annual or perennial herbs, rarely exceeding half a meter in height and usually bearing solitary white daisylike flowers with yellow centers. They are native to Europe but most species can be found scattered in other continents where they have been introduced.
Document 9: Callianthemum: Callianthemum is a genus that consists of 24 species of little rhizomatous herbs from high mountains in Europe, Central Asia and East Asia. The botanical name comes from the Greek, which means beautiful flower. The plants are low-growing, ornamental perennials and are lovely to rock garden. Leaves are small and radical. Flowers are showy daisy-like, 1.5in in diameter, with 5-15 white or rose-color petals and nectaries at the base. Blooming in spring.
Document 10: Cyananthus: Cyananthus is a genus that consists of about 30 species of annual or mostly perennial herbs from high mountains of Central and East Asia. They are little Himalayan plants not higher than 4in. The name comes from the "Greek" for blue flowers. Leaves are usually small and simple, sometimes narrowing to base, tooth-lobed at summit. In August to September, the plants bear showy of bright purplish-blue, yellow or white, funnel to bell-shaped, 5-lobed flowers 1in in diameter with stamens free from the corolla and hairy throat. The flowers are borne singly on stalks. They always lose the aerial parts during the coldest months, and as spring begins, stems and leaves quickly start to reproduce.
Document 11: 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 12: Chrysanthemum: Chrysanthemums ( ), sometimes called mums or chrysanths, are flowering plants of the genus Chrysanthemum in the family Asteraceae. They are native to Asia and northeastern Europe. Most species originate from East Asia and the center of diversity is in China. There are countless horticultural varieties and cultivars.
Document 13: Calendula: 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".
Document 14: Anthemis: Anthemis is a genus of aromatic flowering plants in the family Asteraceae, closely related to "Chamaemelum", and like that genus, known by the common name chamomile; some species are also called dog-fennel or mayweed. "Anthemis" are native to the Mediterranean region and southwest Asia east to Iran. A number of species have also become naturalized in the United Kingdom and other parts of the world.
Document 15: Campanula raineri: Campanula raineri (Rainer's bellflower, Rainer's harebell) is a species of flowering plant in the genus "Campanula" of the family Campanulaceae, native to the Swiss and Italian Alps. It is a low-growing herbaceous perennial growing 5 - tall by up to 20 cm wide, with pale lilac bell-shaped flowers in summer. It is suitable for cultivation in the alpinum or rock garden. It spreads by underground runners.
ground_truth: Callianthemum