Core Yel


Denomination: 'Core Yel'
Trade name: Corey Yellow
Botanical Name: Coreopsis
Applicant/Holder: Syngenta Crop Protection AG
Schwarzwaldallee 215
Breeder: Ralph T. Perkins, Syngenta Flowers, Inc., Gilroy, 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: 2007-01-09
Application Number: 07-5708
Grant of Rights Date: 2010-01-11
Certificate Number: 3716
Date rights surrendered: 2014-01-11

Variety Description

Variety used for comparison: 'Little Sundial'

Summary: 'Core Yel' has a taller plant height than 'Little Sundial'. 'Core Yel' has thicker stems with moderate pubescence while 'Little Sundial' has thinner stems with very sparse pubescence. 'Core Yel' has a shorter leaf blade than 'Little Sundial'. 'Core Yel' has a longer peduncle and larger flower diameter than 'Little Sundial'. 'Core Yel' has a larger area of secondary colour on the upper side of the ray floret than 'Little Sundial'. The secondary colour is brown purple for 'Core Yel' while it is dark purple red for 'Little Sundial'.


PLANT: upright bushy, medium degree of branching
STEM: medium green, absent to very weak anthocyanin colouration, medium pubescence, medium thickness, striated to ribbed

LEAF: opposite arrangement, simple, lanceolate, acute apex, attenuate base, entire margin, sparse pubescence on upper and lower side, medium glaucosity, medium green on upper and lower side, no variegation, no petiole

PEDUNCLE: very weak to weak anthocyanin colouration, medium anthocyanin at base, no pubescence
INFLORESCENCE: head type, terminal position, erect attitude
RAY FLORET: medium number, overlapping, straight longitudinal axis, fan-shaped, medium to deep dentation at apex, very weak to weak curvature of tip, no pubescence on outer side, yellow orange on upper side, yellow on lower side, brown purple secondary colour at base of upper side.

Origin & Breeding History: 'Core Yel' originated from an open pollination that occurred in Gilroy, California, USA in August 1997. The female parent was a proprietary seedling named CO2-F12-1, characterized by yellow coloured flowers with a red eye. The male parent was unknown. In September 2003, a single plant was selected by the breeder based on flower characteristics and a compact plant habit.

Tests & Trials: Trials for 'Core Yel' were conducted during the summer of 2008 in a polyhouse at BioFlora Inc. in St. Thomas, Ontario. There were 15 plants each of the candidate and reference varieties. The reference variety, 'Little Sundial' was grown from bare root plants transplanted into 1 gallon pots on March 27, 2008. The candiate variety was grown from rooted cuttings transplated into 1 gallon pots on April 28, 2008. Observations and measurements were taken from 10 plants on June 24, 2008. All colour determinations were made using the 2001 Royal Horticulture Society (RHS) Colour Chart.

Comparison tables for 'Core Yel' with reference variety 'Little Sundial'

Plant height (cm)

  'Core Yel' 'Little Sundial'
mean 39.8 21.0
std. deviation 1.32 1.41

Leaf blade length (cm)

  'Core Yel' 'Little Sundial'
mean 8.9 10.6
std. deviation 0.42 0.84

Penduncle length (cm)

  'Core Yel' 'Little Sundial'
mean 24.6 12.1
std. deviation 1.26 1.29

Flower diameter (cm)

  'Core Yel' 'Little Sundial'
mean 6.6 5.1
std. deviation 0.24 0.29

Ray floret colour (RHS)

  'Core Yel' 'Little Sundial'
upper side - main 14A (darker than) 14A
upper side - secondary 183A N34A (darker at base)
lower side - main 12A (darker than) 14B

Click on image for larger view
Core Yel
Coreopsis: 'Core Yel' (left) with reference variety 'Little Sundial' (right)

Click on image for larger view
Core Yel
Coreopsis: 'Core Yel' (left) with reference variety 'Little Sundial' (right)

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