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Rockwhite

Saxifrage

Denomination: 'Rockwhite'
Trade name: Touran White
Botanical Name: Saxifraga ×arendsii
Applicant/Holder: Syngenta Crop Protection AG
Schwarzwaldallee 215
Basel
4058
Switzerland
Breeder: M. Gutter, Enkhuizen, Netherlands
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Canada
Tel: 519-317-7511
Application Date: 2007-02-19
Application Number: 07-5739
Grant of Rights Date: 2012-06-23
Certificate Number: 4341
Date rights surrendered: 2014-06-23

Variety Description

Variety used for comparison: 'Findling White'

Summary: The leaf blade of 'Rockwhite' is longer than the leaf blade of 'Findling White'. The flowering stem of 'Rockwhite' is shorter than the flowering stem of 'Findling White'. The hairs on the flowering stem of 'Rockwhite' have red tips while the hairs on the flowering stem of 'Findling White' are colourless. The flower petals of 'Rockwhite' have yellow-green veins while the flower petals of 'Findling White' have whitish, inconspicuous veins. The petals of 'Rockwhite' are broadly elliptic in shape with a broadly acute apex while the petals of 'Findling White' are obovate to orbicular with a rounded apex. The petals of 'Rockwhite' have an absent to weakly reflexed apex while the petals of 'Findling White' have a moderately reflexed apex.

Description:

PLANT: erect growth habit, many flowering stems, dense foliage

LEAF: alternate arrangement, simple, elliptic to obovate shape, apex with 3-5 deep lobes, attenuate base, no petiole

INFLORESCENCE: flowering stem light green with absent to very weak anthocyanin colouration, red tips on hairs on flowering stem, cymose raceme
FLOWERS: bud white (RHS NN155A), upper side of petals white (RHS NN155D), veins on petal yellow green
PETAL: broad elliptic shape, broad acute apex, apex with absent to weak reflexing
ANTHER: yellow before dehiscence
FILAMENT: yellow

Origin & Breeding History: The variety 'Rockwhite' was selected as a white flowered seedling, designated as D621, which originated from three cycles of halfsib selection from the Saxifraga x arendsii variety 'Purperteppich'. The selection cycles were conducted during the period starting in April 2001 through to March 2003 in Enkhuizen, the Netherlands. The variety was selected in March 2003 based on criteria for early spring flowering, strong compact plant habit, free flowering and white flower colour. The variety has been reproduced by cuttings in Enkhuizen, the Netherlands since March 2003.

Tests & Trials: Trials for 'Rockwhite' were conducted in a polyhouse during the spring of 2011 in St. Thomas, Ontario. Trials included 15 plants each of the candidate and reference varieties. Rooted cuttings were transplanted into 11 cm pots in September 2010. Observations and measurements were taken from 10 plants of each variety on May 4, 2011. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.


Comparison tables for 'Rockwhite' with reference variety 'Findling White'

Plant width (cm)

  'Rockwhite' 'Findling White'
mean 12.0 18.7
std. deviation 1.18 1.53

Leaf blade length (mm)

  'Rockwhite' 'Findling White'
mean 15.4 11.8
std. deviation 1.43 0.83

Flowering stem length (cm)

  'Rockwhite' 'Findling White'
mean 5.5 9.9
std. deviation 1.05 1.22

Click on image for larger view
Rockwhite
Saxifrage: 'Rockwhite' (left) with reference variety 'Findling White' (right)

Click on image for larger view
Rockwhite
Saxifrage: 'Rockwhite' (left) with reference variety 'Findling White' (right)

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