disease of chrysanthemum this disease was first discovered in japan in

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" is derived from the Ancient Greek:?????? chrysos (gold) and Ancient Greek:??????? anthemon (flower).

Taxonomy

The genus once included more species, but was split 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 recently included in the narrow view of the genus Chrysanthemum are now used in the genus Glebionis. The other overal separate from Chrysanthemum include Argyranthemum, Leucanthemopsis, Leucanthemum, Rhodanthemum, and Tanacetum.

Description

Outdoors Chrysanthemum taxa are herbaceous perennial plants or subshrubs. They have alternately arranged leaves divided into leaflets with toothed or sometimes smooth edges. The substance inflorescence is an array of several flower minds, or sometimes an one head. The head has a base covered in layers of phyllaries. The simple row of beam florets are white, yellow 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 yellow. The fruit is a ribbed achene. Chrysanthemums, also known as 'mums', are one of the prettiest varieties of perennials that start blooming early in the fall. This is also known as favorite flower for the month of November.

Modern cultivated chrysanthemums are showier than their wild relatives. The flower heads occur in various forms, and is 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 crucial hybrid is Chrysanthemum x morifolium (syn. C. x grandiflorum), derived mainly from C. indicum, but also involving other varieties.Over 140 varieties of chrysanthemum have gained the Royal Horticultural Society's Honor of Garden Merit.

Chrysanthemums are broken into two basic groups, garden hardy and exhibition. Garden hardy mothers are new perennials in a position of wintering in most northern latitudes. Exhibition types are not usually as sturdy. Garden hardies are defined by their capacity to generate an abundance of small blooms with little if any mechanical assistance, such as staking, and withstanding wind and rain. Exhibition varieties, though, require staking, overwintering in a relatively dry, cool environment, and sometimes digging in night time lights.

The exhibition kinds can be used to create many amazing flower forms, such as large disbudded blooms, spray varieties, and many artistically trained forms, such as thousand-bloom, standard (trees), fans, hanging baskets, topiary, bonsai, and cascades.

Chrysanthemum blooms are divided into 10 different bloom forms by the US National Chrysanthemum World, Inc., which is in keeping with the international category system. The bloom varieties are defined by the way in which the ray and disk florets are arranged. Chrysanthemum blossoms consist of many individual flowers (florets), each one capable of manufacturing a seeds. The disk florets are in the center of the bloom head, and the ray florets are on the perimeter. The ray florets are considered imperfect flowers, as they only have the female effective organs, while the storage florets are considered perfect flowers, as they have both male and feminine reproductive organs.

Chrysanthemums