Dark Bronze Yoirvine

Chrysanthemum

Variety Description

Varieties used for comparison: 'Yoauburn' (Auburn) and 'Red Yoauburn' (Red Auburn)

Summary: 'Dark Bronze Yoirvine' has a taller plant and larger flower diameter than 'Yoauburn'. The ray floret of 'Dark Bronze Yoirvine' has a rounded apex while the ray florets of the reference varieties have pointed apexes. The main colour on the inner side of the ray floret is brown red for 'Dark Bronze Yoirvine' while it is orange brown for 'Yoauburn' and dark purple red for 'Red Yoauburn'. The secondary colour on the inner side of the ray floret is brown red and orange brown for 'Dark Bronze Yoirvine' while it is orange brown and light yellow for 'Yoauburn'. The secondary colour is mottled throughout the ray floret for 'Dark Bronze Yoirvine' while it is distributed in stripes on the distal half and mottled throughout for 'Yoauburn'.

Description:

PLANT: spray flowering type, pot plant, 8 week response group, semi upright bushy growth habit, green stem

LEAF: terminal lobe medium to long in length relative to leaf length, lowest lateral lobe sinus medium to deep with mostly parallel margins, base rounded, upper side medium to dark green

FLOWER HEAD: semi-double daisy type, medium density of ray florets
RAY FLORETS: ligulate, very short corolla tube, moderately ascending to horizontal attitude at basal part, flat in cross section at widest point, weak reflexing of longitudinal axis, rounded apex with mamillate tip, inner side brown red (RHS 179A) with brown red to orange brown (RHS 179B-C) secondary colour, secondary colour distributed throughout in a mottled pattern, outer side light brown (RHS N170C) to light yellow brown (RHS 164D) with mottling of red pink (RHS 51C) and brown red (RHS 181C)
DISC: small diameter relative to head diameter, yellow green before anther dehiscence, no dark spot present at centre before dehiscence, medium yellow at anther dehiscence.

Origin & Breeding History: 'Dark Bronze Yoirvine' originated from a naturally occurring whole plant mutation of the parent variety 'Yoirvine' discovered and developed by the breeder, Mrs. Wendy Bergman, in December 2003 in Fort Myers, Florida, USA. 'Dark Bronze Yorivine' was selected in March 2004, based on its strong and spreading growth habit, dark and glossy foliage colour, flower form, flower colour, response time and good winter performance. Asexual reproduction of the variety by vegetative tip cuttings was first conducted in Fort Myers, Florida, USA in March 2004.

Tests & Trials: Trials for 'Dark Bronze Yoirvine' were conducted in Leamington, Ontario, in the fall of 2009. Flowering trials were performed under greenhouse conditions similar to those used in commercial chrysanthemum production. Forty unrooted cuttings of both the candidate and reference variety were directly stuck into 15 cm pots, with 4 cuttings per pot, 10 pots per variety, planted on August 24, 2009. Plants were spaced 30 cm apart and pinched once prior to short day treatment. All plants had the center bud removed. Observations and measurements were taken from 10 plants of each variety on November 6, 2009. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Dark Bronze Yoirvine' with reference varieties 'Yoauburn' and 'Red Yoauburn'

Plant height (cm)

Flower head diameter (cm)

Colour of ray floret (RHS)

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Chrysanthemum: 'Dark Bronze Yoirvine' (left) with reference varieties 'Yoauburn' (centre) and 'Red Yoauburn' (right)

Click on image for larger view

Chrysanthemum: 'Dark Bronze Yoirvine' (left) with reference varieties 'Yoauburn' (centre) and 'Red Yoauburn' (right)