Regal Yoirvine


Denomination: 'Regal Yoirvine'
Trade name: Regal Irvine
Botanical Name: Chrysanthemum ×morifolium
Applicant/Holder: Syngenta Crop Protection AG
Schwarzwaldallee 215
Breeder: Wendy Bergman, Syngenta Flowers, Inc., Alva, United States of America
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2007-06-28
Application Number: 07-5941
Grant of Rights Date: 2011-03-17
Certificate Number: 4021
Date rights surrendered: 2015-01-22

Variety Description

Variety used for comparison: 'Yorockport' (Rockport)

Summary: 'Regal Yoirvine' has a shorter plant than 'Yorockport'. 'Regal Yoirvine' has a larger flower head diameter and longer ray floret than 'Yorockport'. 'Regal Yoirvine' has a higher number of ray florets than 'Yorockport'. 'Regal Yoirvine' differs from 'Yorockport' in the colour on the inner and outer side of the ray floret.


PLANT: spray flowering type, pot plant, 8 week response group, upright to semi upright bushy growth habit, green stem

LEAF: terminal lobe medium to long in length relative to leaf length, lowest lateral lobe sinus medium to deep with diverging to converging margins, base obtuse, upper side medium green

FLOWER HEAD: semi-double daisy type, medium density of ray florets
RAY FLORETS: ligulate, very short corolla tube, moderately ascending to horizontal attitude at basal part, flat to weakly concave in cross section at widest point, straight along longitudinal axis, apex rounded with emarginate and mamillate tip, inner side purple (RHS 64B) with blue pink (RHS N74C) secondary colour, secondary colour distributed throughout in a mottled pattern, outer side violet (RHS 75C) mottled with darker violet (RHS 75A) and blue pink (RHS 72D) stripe along keel
DISC: small diameter relative to head diameter, yellow green before anther dehiscence, no dark spot present at centre before dehiscence, medium yellow at anther dehiscence, disc floret occasionally petaloid, petaloid purple (RHS 64B) when present.

Origin & Breeding History: 'Regal Yoirvine' originated from a naturally occurring whole plant mutation of the parent variety 'Yoirvine' discovered and developed by the breeder, Mrs. Wendy Bergman, in December 2003 in Fort Myers, Florida, USA. 'Regal Yorivine' was selected in March 2004, based on its strong and spreading growth habit, dark and glossy foliage colour, flower form, flower colour, response time and good winter performance. Asexual reproduction of the variety by vegetative tip cuttings was first conducted in Fort Myers, Florida, USA in March 2004.

Tests & Trials: Trials for 'Regal Yoirvine' were conducted in Leamington, Ontario, in the fall of 2009. Flowering trials were performed under greenhouse conditions similar to those used in commercial chrysanthemum production. Forty unrooted cuttings of both the candidate and reference variety were directly stuck into 15 cm pots, with 4 cuttings per pot, 10 pots per variety, planted on August 24, 2009. 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 6, 2009. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Regal Yoirvine' with reference variety 'Yorockport'

Plant height (cm)

  'Regal Yoirvine' 'Yorockport'
mean 24.5 28.1
std. deviation 0.86 1.58

Flower head diameter (cm)

  'Regal Yoirvine' 'Yorockport'
mean 8.8 7.6
std. deviation 0.41 0.34

Ray floret length (cm)

  'Regal Yoirvine' 'Yorockport'
mean 4.2 3.6
std. deviation 0.23 0.12

Number of ray florets

  'Regal Yoirvine' 'Yorockport'
mean 27-30 22-24

Colour of ray floret (RHS)

  'Regal Yoirvine' 'Yorockport'
inner side - main 64B 61A
inner side - secondary N74C 64B
outer side 75C, mottled with 75A, 72D along keel 75B with 67B-C along middle

Click on image for larger view
Regal Yoirvine
Chrysanthemum: 'Regal Yoirvine' (left) with reference variety 'Yorockport' (right)

Click on image for larger view
Regal Yoirvine
Chrysanthemum: 'Regal Yoirvine' (left) with reference variety 'Yorockport' (right)

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