Denomination: 'Koiro'
Trade name: Sunvillea Deep Pink
Botanical Name: Bougainvillea
Applicant/Holder: Suntory Flowers Limited
Administrative Division
4-17-5 Shiba, Minato-ku
Breeder: Masahiro Nakano, Suntory Flowers Limited, Tsushima, Japan
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2011-01-24
Application Number: 11-7156
Grant of Rights Date: 2013-12-19
Certificate Number: 4681
Grant of Rights Termination Date: 2031-12-19

Variety Description

Varieties used for comparison: 'Helen Johnson' and 'Kasumi' (Sunvillea Light Pink)

Summary: The plants of 'Koiro' have shorter internodes than those of 'Helen Johnson'. The stems of 'Koiro' have no thorns while those of 'Helen Johnson' have medium length thorns. The leaves and bracts of 'Koiro' are smaller than those of 'Helen Johnson'. The inflorescences of 'Koiro' have many medium to dense bract clusters while those of 'Helen Johnson' have few to medium number of sparse bract clusters. The colours of the inner and outer sides of the young bracts of 'Koiro' differ from those of 'Kasumi'.


PLANT: upright compact growth habit
YOUNG SHOOT: light green with weak anthocyanin colouration
STEM: no thorns

LEAF BLADE: medium ovate, obtuse base, light to medium green, absent or weak undulation of margin

INFLORESCENCE: auxillary arrangement of bract clusters, many bract clusters, medium to dense bract clusters, flowers present
YOUNG BRACT: outer side when small purple red (RHS 59D), inner side when clayx lobe not open blue pink (RHS 71D), inner side when calyx lobe open purple (RHS N74B),
BRACT: single, medium ovate, obtuse base, upper side of calyx lobes light yellow brown (RHS 158D) with light blue pink (RHS 65C) on the narrower lobes, inner side when calyx lobe wilted blue pink (RHS N74C)

Origin & Breeding History: 'Koiro' orignated as a whole plant mutation of the variety 'Konatu' discovered in April 2006 in an isolated area at Tsushima, Aichi, Japan. The discovered plant was grown in a trial from April 2008 to March 2009 in a controlled environment. The botanical characteristics of the plant were then examined. As a result, it was concluded that this Bougainvillea plant was distiguishable from any other varieties and named 'Koiro'.

Tests & Trials: Trials for 'Koiro' were conducted in a polyhouse during the summer of 2012 in St. Thomas, Ontario. The trial included a total of 15 plants each of the candidate and reference varieties. All plants were grown from rooted cutttings and transplanted into 15 cm shallow pots on May 2, 2012. Observations and measurements were taken from 10 plants of each variety on June 26, 2012. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Koiro' with reference varieties 'Helen Johnson' and 'Kasumi'

Length of plant internode (cm)

  'Koiro' 'Helen Johnson' 'Kasumi'
mean 0.5 1.5 0.4
std. deviation 0.08 0.37 0.04

Leaf blade length (cm)

  'Koiro' 'Helen Johnson' 'Kasumi'
mean 4.6 5.9 4.5
std. deviation 0.15 0.30 0.23

Leaf blade width (cm)

  'Koiro' 'Helen Johnson' 'Kasumi'
mean 2.8 4.5 2.7
std. deviation 0.18 0.29 0.16

Bract length (cm)

  'Koiro' 'Helen Johnson' 'Kasumi'
mean 2.4 4.1 2.3
std. deviation 0.18 0.51 0.11

Bract width (cm)

  'Koiro' 'Helen Johnson' 'Kasumi'
mean 1.5 2.9 1.4
std. deviation 0.08 0.43 0.11

Colour of outer side of young bract (RHS)

  'Koiro' 'Helen Johnson' 'Kasumi'
when small much lighter than 59D lighter than 59D 161A

Colour of inner side of young bract (RHS)

  'Koiro' 'Helen Johnson' 'Kasumi'
calyx lobe note open brighter than 71D brighter than 71D close to 62C with tones close to 161D
calyx lobe open lighter than N74B 71D close to 62C

Click on image for larger view
Bougainvillea: 'Koiro' (left) with reference varieties 'Helen Johnson' (centre) and 'Kasumi' (right)

Click on image for larger view
Bougainvillea: 'Koiro' (left) with reference varieties 'Helen Johnson' (centre) and 'Kasumi' (right)

Click on image for larger view
Bougainvillea: 'Koiro' (left) with reference varieties 'Helen Johnson' (centre) and 'Kasumi' (right)

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