Yokey Largo


Denomination: 'Yokey Largo'
Trade name: Key Largo
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: 2005-04-05
Application Number: 05-4690
Grant of Rights Date: 2009-09-14
Certificate Number: 3604
Date rights surrendered: 2014-09-14

Variety Description

Variety used for comparison: 'Yoforge'

Summary: 'Yokey Largo' has a greyed orange disc colour before anther dehiscence while it is yellow with greyed orange tips on 'Yoforge'.


PLANT: short, eight (8) week response group
STEM: very short to short internode, small to medium diameter, yellow-green (RHS 144A), no anthocyanin colouration, medium strength, no brittleness, angular in cross section
LATERAL SHOOT: medium attachment to stem, medium angle to stem

STIPULE: medium size
LEAF: short to medium length, medium width, medium to high length/width ratio, medium thickness, fleshy texture, medium to coarse serration, green (RHS 137A), medium length lower lobe, rounded and occassionally cordate base, mucronate apex
LEAF SINUS: round base, claw present in base, converging margins

PEDUNCLE: thin, short (terminal flower head only)
INFLORESCENCE: corymbiform, low to medium number of flower heads
FLOWER HEAD: semi-double, small diameter, low height, five or less rows of involucral bracts, no involucral bracts among ray florets
RAY FLORET (GENERAL): very short to short corolla tube, convex in cross-section, medium length/width ratio, 2 keels present, medium thickness, textured surface, mamillate tip
RAY FLORET (MAJORITY): reflexing along longitudinal axis with very weak to weak strength towards the tip, greyed orange (RHS 173D) merging to yellow (RHS 8A) at the margins on outer side, yellow (RHS 7C-8D) on inner side
RAY FLORET (OUTER ROW): reflexing along longitudinal axis with very weak to weak strength towards the tip (occasionally straight), short, narrow to medium width
RAY FLORET (INNER ROWS): greyed orange (RHS 173D) on outer side, yellow (RHS 7C-8D) on inner side

DISC: anemone type, large to very large diameter, Type 4 distribution of disc florets
DISC FLORET: very long, petaloid tending to tubular, greyed orange (RHS 164C) with yellow (RHS 7B) at the mouth of the tube
RECEPTACLE: small diameter, domed raised shape

Origin & Breeding History: 'Yokey Largo' is the product of a planned breeding program conducted by Yoder Brothers Inc. 'Yokey Largo' originated from a cross pollination in February 1999 in Salinas, California, USA, of the proprietary seedling selections coded YB-6403 as the female parent and YB-4447 as the male parent. It was discovered and selected in March 2001 as a single flowering plant within the progeny of the stated cross. Selection criteria included growth habit, inflorescence form, floret colours, response time and postproduction longevity.

Tests & Trials: The detailed description of 'Yokey Largo' is based on the UPOV report of Technical Examination, CPVO reference number 2004/0575, grant number 16408. The trials were conducted by NIAB, in Cambridge, UK in 2004. Colour determinations were made using the 1986 Royal Horticultural Society (RHS) Colour Chart.

Comparison table for 'Yokey Largo' with reference variety 'Yoforge'

Disc colour (RHS)

  'Yokey Largo' 'Yoforge'
before dehiscence 172B 12A with 169B tips

Click on image for larger view
Yokey Largo
Chrysanthemum: 'Yokey Largo'

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