Yellow Yoirvine

Chrysanthemum

Variety Description

Variety used for comparison: 'Yochesapeake' (Chesapeake)

Summary: 'Yellow Yoirvine' has a shorter plant and narrower leaf blade than 'Yochesapeake'. The margin of the lowest lateral leaf lobe sinus is diverging and parallel for 'Yellow Yorivine' while it is overlapping for 'Yochesapeake'. 'Yellow Yoirvine' has a lower number of ray florets than 'Yochesapeake'. The ray floret of 'Yellow Yoirvine' has a horizontal attitude at the basal part while the ray floret of 'Yochesapeake' has a moderately ascending attitude. 'Yellow Yoirvine' has an emarginate and mamillate ray floret tip while 'Yochesapeake' has a pointed tip. 'Yellow Yoirvine' has a lighter yellow colour on the inner and outer side of the ray floret than 'Yochesapeake'.

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 diverging and parallel margins, base obtuse, upper side medium green

FLOWER HEAD: semi-double daisy type, sparse to medium density of ray florets
RAY FLORETS: ligulate, very short corolla tube, horizontal attitude at basal part, flat to weakly concave in cross section at widest point, weak reflexing along longitudinal axis, emarginate and mamillate tip, inner side yellow (RHS 5B), outer side yellow green (RHS 4C)
DISC: small diameter relative to head diameter, green before anther dehiscence, no dark spot present at centre before dehiscence, medium yellow at anther dehiscence.

Origin & Breeding History: 'Yellow 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. 'Yellow 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 'Yellow 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 'Yellow Yoirvine' with reference variety 'Yochesapeake'

Plant height (cm)

Leaf width (cm)

Number of ray florets

Colour of ray floret (RHS)

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Chrysanthemum: 'Yellow Yoirvine' (left) with reference variety 'Yochesapeake' (right)

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Chrysanthemum: 'Yellow Yoirvine' (left) with reference variety 'Yochesapeake' (right)