Regal Yojamestown


Denomination: 'Regal Yojamestown'
Trade name: Regal Jamestown
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: 2007-09-28
Application Number: 07-6013
Grant of Rights Date: 2011-03-17
Certificate Number: 4022
Date rights surrendered: 2015-01-22

Variety Description

Variety used for comparison: 'Dark Pomona'

Summary: 'Regal Yojamestown' has a shorter and narrower leaf than 'Dark Pomona'. 'Regal Yojamestown' has an overlapping leaf lobe sinus while 'Dark Pomona' has a diverging to parallel sinus. The base of the leaf is truncate for 'Regal Yojamestown' while it is obtuse for 'Dark Pomona'. 'Regal Yojamestown' has a smaller flower head diameter than 'Dark Pomona'. The ray floret of 'Regal Yojamestown' is flat in cross section at the widest point while it is moderately convex for 'Dark Pomona'. 'Regal Yojamestown' has a darker purple colour on the inner side of the ray floret than 'Dark Pomona'.


PLANT: spray flowering type, pot plant, 8 week response group, 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 in depth with overlapping margins, base truncate, upper side medium green

FLOWER HEAD: double, medium to dense ray floret density
RAY FLORETS: ligulate, short to medium length corolla tube, flat in cross section at widest point, straight along longitudinal axis, emarginate to dentate tip, inner side purple (RHS 71B), secondary colour violet (RHS 75A), secondary colour positioned throughout in diffuse striped pattern, outer side violet (RHS 75A-D) with white and light blue violet (RHS 76D) at base
DISC: mostly absent, light yellow before anther dehiscence when present.

Origin & Breeding History: 'Regal Yojamestown' originated from a naturally occurring whole plant mutation of the parent variety 'Yojamestown', discovered and developed by the breeder, Mrs. Wendy Bergman, in March 2004 in Fort Myers, Florida, USA. 'Regal Yojamestown' was selected based on its compact and uniform growth habit, excellent plant strength, appearance of foliage, flowering response time, flower form and flower colour. Asexual reproduction of the variety by vegetative tip cuttings was first conducted in Fort Myers, Florida, USA in June 2004.

Tests & Trials: Trials for 'Regal Yojamestown' 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 Yojamestown' with reference variety 'Dark Pomona'

Leaf length (cm)

  'Regal Yojamestown' 'Dark Pomona'
mean 7.3 9.1
std. deviation 0.52 0.76

Leaf width (cm)

  'Regal Yojamestown' 'Dark Pomona'
mean 4.5 5.2
std. deviation 0.33 0.53

Flower head diameter (cm)

  'Regal Yojamestown' 'Dark Pomona'
mean 6.2 7.3
std. deviation 0.32 0.63

Colour of ray floret (RHS)

  'Regal Yojamestown' 'Dark Pomona'
inner side - main 71B 71C-D
inner side - secondary 75A 75A, as light as 76C
outer side 75A-D with white and 76D at base white and 76D, with 75A-B at apex

Click on image for larger view
Regal Yojamestown
Chrysanthemum: 'Regal Yojamestown' (left) with reference variety 'Dark Pomona' (right)

Click on image for larger view
Regal Yojamestown
Chrysanthemum: 'Regal Yojamestown' (left) with reference variety 'Dark Pomona' (right)

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