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 Ancient greek:?????? chrysos (gold) and Aged Greek:??????? anthemon (flower).
Taxonomy
The genus once included more species, unfortunately he 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 contentious, 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 organized leaves divided into leaflets with toothed or sometimes smooth edges. The chemical substance inflorescence is an mixture of several flower minds, or sometimes a solitary head. The head has a base covered in layers of phyllaries. The simple row of beam florets are white, orange or red; many horticultural specimens have been carefully bred to bear many rows of ray florets in a great variety of colors. The disc florets of wild taxa are yellow. The fruit is a ribbed achene. Chrysanthemums, also known as 'mums', are one of the lovliest 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 pompons or buttons. This genus contains many hybrids and thousands of cultivars developed for horticultural purposes. As well as 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 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 capability to generate an abundance of small blooms with little if any mechanical assistance, such as staking, and withstanding wind and rainwater. Exhibition varieties, though, require staking, overwintering in a relatively dry, cool environment, and sometimes the addition of night time lights.
The exhibition kinds can be used to create many amazing herb forms, such as large disbudded blooms, spray forms, and many artistically trained forms, such as thousand-bloom, standard (trees), fans, suspending 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 classification system. The bloom forms are defined by the way in which the ray and disk florets are arranged. Chrysanthemum flowers are composed of many individual flowers (florets), each one capable of producing a seedling. 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 own the female successful organs, while the drive florets are considered perfect flowers, as they have both male and feminine reproductive organs.
Chrysanthemum – Bacterial leaf spot Pseudomonas cichorii UMass
cichorii on chrysanthemum Chrysanthemum spp. 1525124
Figure 2. Closeup of Pythium spreading into Chrysanthemum leaves.
ChrysanthemuWhite Rust: Good Management Prevents Major Losses
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