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 about 40 valid species. There are countless horticultural varieties and cultivars.
Zinnia is a genus of 20 species of annual and perennial plants of the family Asteraceae. They are native to scrub and dry grassland in an area stretching from the Southwestern United States to South America, with a centre of diversity in Mexico. Members of the genus are notable for their solitary long-stemmed flowers that come in a variety of bright colors. The genus name honours German botanist Johann Gottfried Zinn
Lantana’s aromatic flower clusters (called umbels) are a mix of red, orange, yellow, or blue and white florets. Other colors exist as new varieties are being selected. The flowers typically change color as they mature, resulting ininflorescences that are two- or three-colored.
Celosia /siːˈloʊʃiə/ is a small genus of edible and ornamental plants in the amaranth family, Amaranthaceae. The generic name is derived from the Greek word κηλος (kelos), meaning “burned,” and refers to the flame-likeflower heads. Species are commonly known as woolflowers, or, if the flower heads are crested by fasciation, cockscombs. The plants are well known in East Africa’s highlands and are used under their Swahili name, mfungu.
Hibiscus (/hɨˈbɪskəs/ or /haɪˈbɪskəs/) is a genus of flowering plants in the mallow family, Malvaceae. It is quite large, containing several hundred species that are native to warm-temperate, subtropical and tropical regions throughout the world. Member species are often noted for their showy flowers and are commonly known simply as hibiscus, or less widely known as rose mallow. The genus includes both annual and perennial herbaceous plants, as well as woody shrubs and small trees. The generic name is derived from the Greek word ἱβίσκος (hibískos), which was the name Pedanius Dioscorides (ca. 40–90) gave to Althaea officinalis.
Petunia is genus of 35 species of  flowering plants of South American origin, closely related to tobacco, cape gooseberries, tomatoes, deadly nightshades, potatoes and chili peppers; in the family Solanaceae. The popular flower of the same name derived its epithet from the French, which took the word petun, meaning “tobacco,” from a Tupi–Guarani language. An annual, most of the varieties seen in gardens are hybrids (P. × atkinsiana, also known as P. hybrida) Echinacea /ˌɛkɨˈneɪʃ(i)ə/ is a genus, or group of herbaceous flowering plants in the daisy family, Asteraceae. The nine species it contains are commonly called coneflowers. They are endemic to eastern and central North America, where they are found growing in moist to dry prairies and open wooded areas. They have large, showy heads of composite flowers, blooming from early to late summer. The generic name is derived from the Greekword ἐχῖνος (echino), meaning “sea urchin,” due to the spiny central disk. Some species are used in herbal medicines and some are cultivated in gardens for their showy flowers. A few species are of conservation concern.Evidence does not support echinacea being useful for either the common cold, or cancer.
Hydrangea quercifolia flowers are borne in erect panicles 6–12 in (15.2–30.5 cm) tall and 3–5 in (7.6–12.7 cm) wide at branch tips. Flowers age in colour from creamy white, aging to pink and by autumn and winter are a dry, papery rusty-brown.
Rudbeckia hirta, commonly called black-eyed Susan, is a species of flowering plant in the family Asteraceae, native to the Eastern and Central United States. It is one of a number of plants with the common name black-eyed Susan. Other common names for this plant include: brown-eyed Susan, brown Betty, gloriosa daisy, golden Jerusalem, Poorland daisy, yellow daisy, and yellow ox-eye daisy.
Gardenia They are evergreen shrubs and small trees growing to 1–15 metres (3.3–49.2 ft) tall. The leaves are opposite or in whorls of three or four, 5–50 centimetres (2.0–19.7 in) long and 3–25 centimetres (1.2–9.8 in) broad, dark green and glossy with a leathery texture. The flowers are solitary or in small clusters, white, or pale yellow, with a tubular-based corolla with 5-12 lobes (petals) from 5–12 centimetres (2.0–4.7 in) diameter. Flowering is from about mid-spring to mid-summer and many species are strongly scented.
definition of these species courtesy of wikipidia