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. The name "chrysanthemum" comes from the Ancient Greek:?????? chrysos (gold) and Old Greek:??????? anthemon (flower).
Taxonomy
The genus once included more species, but was divided several decades ago into several genera, putting the economically important florist's chrysanthemums in the genus Dendranthema. The naming of the genera has been good, but a ruling of the International Botanical Congress in 1999 changed the defining species of the genus to Chrysanthemum indicum, restoring the florist's chrysanthemums to the genus Chrysanthemum.The other species previously included in the narrow view of the genus Chrysanthemum are now utilized in the genus Glebionis. The other genera separate from Chrysanthemum include Argyranthemum, Leucanthemopsis, Leucanthemum, Rhodanthemum, and Tanacetum.
Description
Wild Chrysanthemum taxa are herbaceous perennial plants or subshrubs. They have alternately arranged leaves divided into booklets with toothed or occasionally smooth edges. The compound inflorescence is an mixture of several flower minds, or sometimes a solo head. The head has a base covered in layers of phyllaries. The simple row of ray florets are white, orange or red; many horticultural specimens have been bred to bear many series of ray florets in a great variety of colours. The disc florets of wild taxa are yellowish. The fruit is a ribbed achene. Chrysanthemums, also known as 'mums', are one of the nicest varieties of perennials that start blooming early in the fall. This is also known as favorite flower for the month of November.
Modern developed chrysanthemums are showier than their wild relatives. The flower heads occur in various forms, and can be daisy-like or decorative, like aigrette or buttons. This genus contains many hybrids and thousands of cultivars developed for horticultural purposes. In addition to the traditional yellow, other colors are available, such as white, purple, and red. The most important hybrid is Chrysanthemum x morifolium (syn. C. x grandiflorum), derived generally from C. indicum, but also involving other types.Over 140 varieties of chrysanthemum have gained the Royal Horticultural Society's Prize of Garden Merit.
Chrysanthemums are split up into two basic groups, garden hardy and exhibition. Garden hardy mums are new perennials capable of wintering in most northern latitudes. Exhibition types are not usually as sturdy. Garden hardies are defined by their capacity to produce an abundance of small blooms with little if any mechanical assistance, such as staking, and withstanding wind and rainfall. Exhibition varieties, though, require staking, overwintering in a relatively dry, cool environment, and sometimes digging in night lights.
The exhibition varieties can be used to create many amazing herb forms, such as large disbudded blooms, spray varieties, and many artistically trained forms, such as thousand-bloom, standard (trees), fans, dangling baskets, topiary, bonsai, and cascades.
Chrysanthemum blooms are divided into 10 different bloom forms by the US National Chrysanthemum Society, Inc., which is in preserving the international category system. The bloom varieties are defined by the way in which the ray and disk florets are arranged. Chrysanthemum blooms are composed of many specific flowers (florets), each one capable of manufacturing a seed. The disk florets are in the center of the bloom head, and the ray florets are on the perimeter. The ray florets are believed not perfect flowers, as they only have the female successful organs, while the disk florets are considered perfect flowers, as they own both male and feminine reproductive organs.
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