Dekcosmic

Chrysanthemum

Variety Description

Variety used for comparison: 'Deksavanna'

Summary: The margins of the lowest lateral sinus of the leaf are overlapping for 'Dekcosmic' while the margins of the lowest lateral sinus of 'Deksavanna' are converging. The predominant shape of the base of the leaf of 'Dekcosmic' is rounded while it is obtuse for 'Deksavanna'. The diameter of the disc relative to the flower head diameter is small to medium for 'Dekcosmic' while it is medium to large for 'Deksavanna'.

Description:

PLANT: pot chrysanthemum, tall to very tall, non-bushy type, response group 4 (7 weeks) when grown with precise day length control
STEM: green, medium size stipule

PETIOLE: attitude is horizontal, short to medium length relative to leaf length
LEAF: attitude is horizontal, medium length including petiole, medium width, medium length to width ratio, length of terminal lobe relative to leaf length is short to medium, lowest lateral sinus is medium to deep, margins of lowest lateral sinus are overlapping, predominant shape of base is rounded, weak glossiness on upper side, medium green on upper side, few indentations of margin, shallow to medium depth of indentations of margin

INFLORESCENCE: deeply domed form, narrow at widest point, small angle between primary lateral shoot and stem, attitude of lateral flower heads is upright
FLOWER BUD: outer side is yellow orange (RHS 11A) just before opening
FLOWER HEAD: few per stem, semi-double, daisy type, medium diameter in non-disbudded plants, medium to high height in non-disbudded plants, medium to long peduncle, few rows of ray florets
RAY FLORET: medium to many per flower head, ligulate type, attitude of basal part is moderately ascending, ribbed on upper surface, short corolla tube, weakly convex profile in cross-section at widest point, weakly involute margins along basal quarter, longitudinal axis has medium reflexing along distal half, longitudinal axis of ray floret from inner row has medium reflexing along distal quarter, short to medium length, broad to very broad, low length to width ratio, pointed tip, inner side is yellow (RHS 6B), colour of outer side is similar to colour of inner side
DISC: medium diameter, small to medium diameter relative to flower head diameter, green without dark spot at centre before anther dehiscence, yellowish green at anther dehiscence

Origin & Breeding History: 'Dekcosmic' was bred and developed by the breeder, Cornelis W. Dekker, in Hensbroek, Netherlands, as part of a planned breeding program. It originated from a hybrid cross conducted in September 2007 between the proprietary seedling designated '49796' as the female parent, and the proprietary seedling designated '50340' as the male parent. 'Dekcosmic' was selected from the resultant progeny in March 2008 based on its strong plant vigour, strong stem, and good vase life. Asexual reproduction of 'Dekcosmic' was first conducted in April 2008.

Tests & Trials: The detailed description of 'Dekcosmic' is based on the UPOV report of Technical Examination, application number 2010/0686, purchased from the Community Plant Variety Office in Angers, France. The trials were conducted by the National Institute of Agricultural Botany in Cambridge, United Kingdom, in 2011. Colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Click on image for larger view

Chrysanthemum: 'Dekcosmic'