Denomination: 'Yokilleen'
Trade name: Killeen
Botanical Name: Chrysanthemum ×morifolium
Applicant/Holder: Syngenta Crop Protection AG
Schwarzwaldallee 215
Breeder: Peter Wain, Southampton, United Kingdom
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2005-10-03
Application Number: 05-5066
Grant of Rights Date: 2010-03-19
Certificate Number: 3818
Date rights surrendered: 2012-01-16

Variety Description

Variety used for comparison: 'Onyx Time'

Summary: The base of the leaves of 'Yokilleen' are acute while those of 'Onyx Time' are obtuse to truncate. 'Yokilleen' has domed inflorescences while 'Onyx Time' has corymbiform or flat inflorescences. The flower heads of 'Yokilleen' are smaller, quilled type and in the green colour group while those of 'Onyx Time' are larger, decorative type and in the yellow colour group. 'Yokilleen' has dense to very dense quilled ray florets while 'Onyx Time' has medium to dense ligulate ray florets with some spatulate inner ray florets. The corolla tubes of 'Yokilleen' are longer than those of 'Onyx Time'. 'Yokilleen' has shorter ray florets than 'Onyx Time'. The ray florets of 'Yokilleen are green while those of 'Onyx Time' are yellow.


PLANT: year round cultivation for pot production, pinched type, spray flowering type, 8 week response group
STEM: green

LEAF: acute base, mostly parallel margins of sinus between lateral lobes, medium green

FLOWER HEAD: quilled double type, self coloured, green colour group, light to medium intensity of colour, dense to very dense ray florets
RAY FLORET: quilled, straight longitudinal axis of majority, quilled tip, light green (RHS 145C) aging to yellow green (RHS 150D) on upper side, light green (RHS 145C) aging to yellow green (RHS 150D) on lower side
DISC: yellow green before anther dehiscence, medium yellow at anther dehiscence
DISC FLORET: center mass distribution

Origin & Breeding History: 'Yokilleen' originated from a cross pollination made in February 2000 in Fareham, Hampshire, United Kingdom between the female parent, proprietary seedling selection P283D 6, and the male parent, proprietary seedling selection P363D 1. The new variety was the product of a planned breeding program conducted by the breeder Mr. Peter Wain. 'Yokilleen' was discovered and selected by the breeder as a single flowering plant in 2001. Selection of 'Yokilleen' was based on plant growth habit, inflorescence form, floret colours, response time and postproduction longevity. Asexual reproduction of the variety by vegetative tip cuttings was first conducted in Fareham, Hampshire, United Kingdom in 2001.

Tests & Trials: Trials for 'Yokilleen' were conducted in Leamington, Ontario in the fall of 2008. Flowering trials were performed under greenhouse conditions similar to those used in commercial chrysanthemum production. Forty unrooted cuttings of the candidate variety were directly stuck into 15 cm pots, with 4 cuttings per pot, 10 pots per variety planted August 18, 2008. Plants were spaced 30 cm apart and pinched once prior to short day treatment. All plants had the center bud removed. Observations and measurements were taken from 10 plants of each variety on November 3, 2008. All colour determinations were made using the 2001 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Yokilleen' with reference variety 'Onyx Time'

Flower head diameter (cm)

  'Yokilleen' 'Onyx Time'
mean 4.3 8.5
std. deviation 0.19 0.62

Corolla tube length (cm)

  'Yokilleen' 'Onyx Time'
mean 1.4 0.7
std. deviation 0.30 0.08

Ray floret length (cm)

  'Yokilleen' 'Onyx Time'
mean 1.9 3.5
std. deviation 0.19 0.19

Colour of ray florets (RHS)

  'Yokilleen' 'Onyx Time'
main - upper side more yellow than 145C aging to 150D 155A-B to 7D inner florets and 150C at centre
secondary - upper side N/A 4C
main - lower side more yellow than 145C aging to 150D 4D fading to 155B with 4C along keels

Click on image for larger view
Chrysanthemum: 'Yokilleen' (left) with reference variety 'Onyx Time' (right)

Click on image for larger view
Chrysanthemum: 'Yokilleen' (left) with reference variety 'Onyx Time' (right)

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