Yellow Xenox


Denomination: 'Yellow Xenox'
Botanical Name: Hylotelephium telephium
Applicant/Holder: Future Plants Licentie B.V.
Turfspoor 53A
2165 AW
Breeder: Hubertus Gerardus Oudshoorn, Rijpwetering, Netherlands
Agent in Canada: Variety Rights Management
475 County Road 18
R.R. #2
Oxford Station, Ontario
K0G 1T0
Tel: 613-258-9015
Application Date: 2010-01-08
Application Number: 10-6799
Grant of Rights Date: 2013-09-05
Certificate Number: 4615
Grant of Rights Termination Date: 2031-09-05

Variety Description

Varieties used for comparison: 'Bronco' and 'Twinkling Star'

Summary: The plants of 'Yellow Xenox' are smaller than those of 'Bronco'. The stems of 'Yellow Xenox' are medium thickness with strong anthocyanin colouration while those of 'Bronco' are thick with medium anthocyanin colouration. The leaves of 'Yellow Xenox' are smaller than those of 'Bronco'. The inflorescence of 'Yellow Xenox' are smaller than those of both reference varieties. The secondary colour at the base of the petals of 'Yellow Xenox' is yellow while that on 'Bronco' is brown purple and that on 'Twinkling Star' is light yellow brown.


PLANT: vegetatively reproduced, perennial, upright-bushy growth habit, sparse to medium branching density
STEM: purple, strong anthocyanin colouration, absent or very weak glaucosity, absent or very weak pubescence, medium thickness, smooth

LEAF: opposite arrangement, simple, ovate, acute apex, cordate base, dentate margin, absent or very sparse pubescence on upper and lower sides, absent or very weak glaucosity on upper side, brown green (RHS 147B-C) with dark brown (RHS N186C) anthocyanin colouration on upper side, no variegation, no petiole

INFLORESCENCE: late flowering, medium to long flowering period, cyme, terminal position, erect attitude
PETAL: very open arrangement, few, small, ovate, acute apex, absent or very weak recurvature of tip, entire margin, absent or very sparse pubescence on lower side, upper and lower sides white (RHS 155A) with yellow (RHS 7D) at base

Origin & Breeding History: 'Yellow Xenox' originated from a population of seedlings created from the hybridization of 'Xenox' and 'Sunkissed' at Rijpwetering, The Netherlands in the summer of 2005. The new variety was selected in the summer of 2006 from the population of seedlings based on plant habit and flower colour.

Tests & Trials: Trials for 'Yellow Xenox' were conducted at Variety Rights Management in Oxford Station, Ontario during the summer of 2012. The trial consisted of 11 plants of 'Yellow Xenox', 5 plants of 'Bronco' and 11 plants of 'Twinkling Star' with one plant per pot. The pots were 22 cm in diameter and were spaced approximately 45 cm apart. All colour determinations were made using the 2001 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Yellow Xenox' with reference varieties 'Bronco' and 'Twinkling Star'

Plant height (cm)

  'Yellow Xenox' 'Bronco' 'Twinkling Star'
mean 25.10 65.00 26.35
std. deviation 1.41 9.14 1.60

Plant width (cm)

  'Yellow Xenox' 'Bronco' 'Twinkling Star'
mean 28.50 39.20 24.50
std. deviation 1.91 6.22 2.88

Leaf blade length (cm)

  'Yellow Xenox' 'Bronco' 'Twinkling Star'
mean 4.30 5.84 4.56
std. deviation 0.40 0.79 0.43

Leaf blade width (cm)

  'Yellow Xenox' 'Bronco' 'Twinkling Star'
mean 2.23 3.49 2.38
std. deviation 0.24 0.57 0.24

Inflorescence diameter (cm)

  'Yellow Xenox' 'Bronco' 'Twinkling Star'
mean 8.42 16.17 10.72
std. deviation 0.97 2.32 1.64

Colour of upper side of petal (RHS)

  'Yellow Xenox' 'Bronco' 'Twinkling Star'
secondary 7D 185D 158B

Click on image for larger view
Yellow Xenox
Sedum: 'Yellow Xenox' (left) with reference varieties 'Bronco' (centre) and 'Twinkling Star' (right)

Click on image for larger view
Yellow Xenox
Sedum: 'Yellow Xenox' (top left) with reference varieties 'Bronco' (top right) and 'Twinkling Star' (bottom)

Date modified: