Question: What word used is used to classify a group or family of related living organisms; two examples being Clytostoma from tropical America and Syneilesis from East Asia?

full_context: Document 1: Clytostoma: Clytostoma was a genus of woody-stemmed vines from tropical America, native to Argentina and the southern part of Brazil. It is now considered a synonym of "Bignonia". The botanical name comes from the Greek, "klytos" means splendid or beauteous, and "stoma" means mouth; alluding to the beautiful flowers. It is closely related to "Bignonia", from which it differs chiefly in its simple slender tendrils, the short disk, and that it has a habit of clambering over adjacent foliage using tendrils to hang on tight. The bright glossy green leaves are lobed and divided with 2 leaflets, about 3in (7.6cm) long and 1.5in (3.8cm) wide. They are arranged opposite in pairs and tendrils arise at the ends of the leaf stalks. In late spring, the spectacular 1.5in (3.8cm) trumpet flowers are borne terminally or along the branches. The flowers are pale lavender and delicately detailed with dark violet and purple veins. Flowers are followed by large prickly seed pods. This evergreen ornamental plant easily reaches to 16 feet and is a carefree grower. It has only recently been moved out of the genus "Pandorea".
Document 2: Gelsemium: Gelsemium is an Asian and North American genus of flowering plants belonging to family Gelsemiaceae. The genus contains three species of shrubs to straggling or twining climbers. Two species are native to North America, and one to China and Southeast Asia.
Document 3: Crepis sibirica: Crepis sibirica, is an Asian and eastern European species of plants in the dandelion tribe within the sunflower family. It has been found in China (Heilongjiang, Liaoning, Inner Mongolia, Xinjiang), Mongolia, Russia, Central Asia, and eastern Europe.
Document 4: Campsis × tagliabuana: Campsis" × "tagliabuana (Madame Galen) is a mid-19th-century hybrid between "Campsis radicans" (American trumpet vine) and "Campsis grandiflora" (Chinese trumpet vine). It produces trumpet-shaped, orange to red flowers up to 3 in long that appear in loose clusters of 6 to 12. It is a woody, clinging, perennial vine that attaches itself to structures and climbs vigorously with aerial roots like those of ivy. It bears dark-green deciduous leaves, 8 - long. Its flowers are very attractive to bees, butterflies and birds. Like its parents it is hardy but in cooler temperate regions requires the shelter of a sunny wall to produce its spectacular flowers in abundance.
Document 5: Semiarundinaria: Semiarundinaria is a genus of East Asian bamboo in the grass family.
Document 6: Cydista: Cydista is a genus that consists of more than twenty species of lowland, showy, evergreen, ornamental shrubs and woody vines, ranging from central and southern Mexico to Paraguay and eastern Brazil. The genus is characterized by the lack of a nectariferous disk and is associated with the multiple-bang flowering syndrome. All species are lianas with clusters of funnelform flowers, bloomig twice a year in spring and fall. The flowers start of purple and change to a lighter shade of lavender with age, then fading to almost white, followed by linear oblong fruits and winged seeds. The plants are multi-stemmed with opposite, oval, glossy, dark-green leaves and 2 leaflets, and climb by tendrils arise from the leaf axils. Leaves smell like garlic when crushed.
Document 7: Sesleria: Sesleria is a Eurasian and North African genus of perennial plants in the grass family.
Document 8: Syneilesis: Syneilesis is a genus of East Asian plants in the groundsel tribe within the Asteraceae.
Document 9: Lophospermum: Lophospermum is a genus of herbaceous perennial climbers or scramblers, native to mountainous regions of Mexico and Guatemala. Those that climb use twining leaf stalks. Their flowers are tubular, in shades of red, violet and purple, the larger flowers being pollinated by hummingbirds. Now placed in the greatly expanded family Plantaginaceae, the genus was traditionally placed in the Scrophulariaceae. The close relationship with some other genera, particularly "Maurandya" and "Rhodochiton", has led to confusion over the names of some species.
Document 10: Campsis: Campsis (trumpet creeper, trumpet vine) is a genus of flowering plants in the family Bignoniaceae, native to woodland in China and North America. It consists of two species, both of which are vigorous deciduous perennial climbers, clinging by aerial roots, and producing large trumpet-shaped flowers in the summer. They are hardy but require the shelter of a warm wall in full sun.
Document 11: Syringa: Syringa (lilac) is a genus of 12 currently recognized species of flowering woody plants in the olive family (Oleaceae), native to woodland and scrub from southeastern Europe to eastern Asia, and widely and commonly cultivated in temperate areas elsewhere.
Document 12: Clerodendrum splendens: Clerodendrum splendens (glory tree, flaming glorybower) is a species of flowering plant in the genus "Clerodendrum" of the family Lamiaceae, native to tropical Western Africa. It is a twining evergreen climber, growing to 3 m or more, with panicles of brilliant scarlet flowers in summer. With a minimum temperature of 10 C , it requires the protection of glass during the winter months in most temperate regions.
Document 13: Chlidanthus: Chlidanthus is a genus that consists of 10 species of tender bulbs from tropical South America, mostly natives to the Andes. The botanical name comes from the Greek, meaning "delicate flower". The plants have large spherical bulbs with gray-green, strap-shaped leaves 30cm long arising from the base. In late spring to early summer, clusters of 3-4 large, strong citrus-scented fragrant, funnel-shaped flowers 10-13cm long held terminally on stalks 25cm high, colored in yellow, pink or red.
Document 14: Campsis radicans: Campsis radicans (trumpet vine or trumpet creeper, also known in North America as cow itch vine or hummingbird vine), is a species of flowering plant of the family Bignoniaceae, native to the eastern United States and naturalized in parts of the western United States as well as in Ontario, parts of Europe, and scattered locations in Latin America. Growing to 10 m , it is a vigorous, deciduous woody vine, notable for its showy trumpet-shaped flowers. It inhabits woodlands and riverbanks, and is also a popular garden subject.
Document 15: Silene: Silene is a genus of flowering plants in the family Caryophyllaceae. Containing approximately 700 species, it is the largest genus in the family. Common names include campion (which is shared with the related genus "Lychnis") and catchfly. Many "Silene" species are widely distributed, particularly in the northern hemisphere.
ground_truth: genus