Abstract:
A  Chrysanthemum  plant named ‘Redock White’ characterized by its medium sized single type blooms with white ray-florets and yellow-green disc florets.

Description:
RELATED CULTIVARS  
       [0001]     ‘Redock White’ is related to ‘Redock Yellow’ (copending U.S. Plant Pat. application), ‘Redock Dark’ (U.S. Plant Pat. pending), ‘Redock Salmon’ (U.S. Plant Pat. pending), and ‘Redock Orange’ (U.S. Plant Pat. pending). These varieties are all mutants of the original ‘Redock’ (unpatented).  
       BACKGROUND OF THE INVENTION  
       [0002]     ‘Redock White’ is a product of a breeding and selection program which had the objective of finding color mutants of ‘Redock’. The new plant of the present invention comprises a new and distinct cultivar of  chrysanthemum  plant that is a natural occurring sport of a parent  chrysanthemum  named ‘Redock’ (unpatented). A comparison with Parent  chrysanthemum  ‘Redock’ is also made in this application. The new cultivar was discovered as a whole plant mutation in 2001 by Mark Roland Boeder in a controlled environment (greenhouse) in Rijsenhout Holland. The first act of asexual reproduction of ‘Redock White’ was accomplished when vegetative cuttings were taken from the initial selection in 2001 in Rijsenhout Holland.  
       SUMMARY OF THE INVENTION  
       [0003]     The present invention is a new and distinct variety of  chrysanthemum  bearing medium sized blooms with white ray-florets and yellow-green disc florets. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0004]     The present invention of a new and distinct variety of  chrysanthemum  is shown in the accompanying drawings, the color being as nearly true as possible with color photographs of this type.  
         [0005]      FIG. 1  shows a plant of the cultivar in full bloom.  
         [0006]      FIG. 2  shows the bloom of the cultivar in various stages  
         [0007]      FIG. 3  shows the foliage of the cultivar 
     
    
     DESCRIPTION OF THE INVENTION  
       [0008]     This new variety of  chrysanthemum  is of the botanical classification  Chrysanthemum morifolium  L. The observations and measurements were gathered from plants grown in April/May in a greenhouse in Rijsenhout Holland in a photo-periodic controlled crop under conditions generally used in commercial practice. The greenhouse temperatures during this crop were at day-time between 18° C. and 25° C. and at night 20° C. After a long day period of 14 days the photo-periodic response time in this crop was 47 days. After the long day period to flowering growth retardants were applied 3 times in an average dose of 2.5 gram/liter water. No tests were done on disease or insect resistance or susceptibility. This new variety produces medium sized blooms with white ray-florets and yellow-green disc-florets blooming on the plant for 4 weeks. This new variety of  chrysanthemum  has been found to retain its distinctive characteristics throughout successive propagations however the phenotype may vary significantly with variations in environment such as light intensity and temperature. To show the phenotype as described ‘Redock White’ can be planted without assimilation lightning (high pressure sodium lamps) between week 1 and week 52 under greenhouse conditions in Holland. With assimilation light (minimum level 2500 lux) it can be planted year round under greenhouse conditions in Holland.  
         [0009]     The difference between ‘Redock’ and its sport ‘Redock White’ is flower color. From the cultivars known to inventor the most similar existing cultivars in comparison to ‘Redock White’ are the original ‘Redock’ and its several sports and ‘White Reagan’ (U.S. Plant Pat. No. 8,784). When ‘Redock White’ is being compared with ‘Redock’, the following differences and similarities are noticed: The difference of ‘Redock White’, and ‘Redock’ is the (1) ray-floret color. The color of ‘Redock White’ is white, that of ‘Redock’ is pink. All other characteristics of members of the ‘Redock’ family are similar. While when ‘Redock White’ is being compared with ‘Reagan White’, the following differences and similarities are noticed. ( 1 ) ray-floret color. Both ‘Redock White’ and ‘White Reagan’ have white florets. (2) height of bloom. The bloom height of ‘Redock White’ is high, while that of ‘White Reagan’ is low. (3) cross-section of ray-florets. This is strongly concave for ‘Redock White’, while it is flat for ‘White Reagan’. (4) vigour. The plants of ‘Redock White’ are more vigorous than those of ‘White Reagan’. (5) plant height. The plants of ‘Redock White’ are higher than ‘White Reagan’.  
         [0010]     The following is a description of the plant and characteristics that distinguish ‘Redock White’ as a new and distinct variety. The color designations are taken from the plant itself. Accordingly, any discrepancies between the color designations and the colors depicted in the photographs are due to photographic tolerances. The color chart used in this description is: The Royal Horticultural Society Colour Chart, edition 1995.  
                         TABLE 1                       Botanical Description of CULTIVAR ‘Redock White’                                Bud           Size   Small, cross-section 0.7 cm height           0.9 cm       Outside Color   White 155A       Involucral bracts   3 rows, length 8 mm, width 3 mm       Involucral bracts among disc-florets   Not present       Involucral bracts color   Green 147 B       Bloom       Type   Single       Height   High       Size   Medium       Fully Expanded   7.0 cm       Number of blooms per single stem   Average of 15-20       Seeds   Not produced       Performance (blooming period)   4 weeks       Fragrance   Typical chrysanthemum       Color       Center of the flower (disc-florets)   Immature yellow-green 144 A           Mature yellow-green 151 C       Color of upper surface of the majority   White 155D       of the ray-florets       Color of the lower surface of the   White 155D       majority of the ray-florets       Tonality from Distance   A spray mum with white flowers           and a yellow-green disc       Color of the upper surface of the   White 155D       ray-florets after aging of the plant       Ray florets       Texture   Upper and under side smooth       Number   26-28       Cross-section   Strongly concave       Longitudinal axis of majority   Reflexing       Length of corolla tube   Short       Ray-floret length   3.3 cm       Ray-floret width   1.0 cm       Ratio length/width   Medium       Shape of tip   Pointed, very occasionally round       Disc florets       Disc diameter   0.8-1.0 cm       Distribution of disc florets   Numerous, clearly visible at all           stages of flowering       Shape   Tubular       Color   Yellow-green 144 A       Receptacle shape   Conical raised       Reproductive Organs       Stamen (present in disc florets only)   Thin 3 mm in length       Stamen color   Yellow-green 144 B       Pollen   No pollen present       Pollen color   Not applicable       Styles (present in both ray and disc   Thin       florets)       Style color   Yellow-green 144 B       Style Length   4 mm       Stigma color   Yellow-green 144 B       Stigma Width   2 mm       Ovaries   Enclosed in perianth       Plant       Form   A spray mum meant for erect           culture       Growth habit   Upright       Growth rate   Very vigorous       Height   125-135 cm       Internodes   2.5-3.0 cm       Spray formation   Corymbiform       Stem Color   Yellow-green 147 B       Stem Strength   Medium       Stem Brittleness   Present       Stem Anthocyanin Coloration   Absent       Peduncle length   Near the top 16 cm, near the           middle 23 cm, near the bottom           28 cm       Peduncle color   Green 147 B       Peduncle, attachment   Brittle       Peduncle, angle with stem   Small, 30° C.       Flowering Response(photo-periodic   47 days       controlled crop, not natural season)       Foliage       Color   Upper side yellow-green 147 A           Under side green 138 B       Size   large; length 12.0-14.0 cm,           width 7.0-8.0 cm       Quantity (number per single stem)   30-34       Shape   Ovate and deeply lobed       Texture upper side   Fleshy and glabrous       Texture under side   Pubescent       Ribs and veins upper side   Ribs and veins well developed       Ribs and veins under side   Ribs and veins well developed       Venation arrangement   Palmate       Shape of the margin   Lobed       Shape of Base of Sinus Between   Round       Lateral Lobes       Margin of Sinus Between Lateral   Converging       Lobes       Shape of Base   Rounded       Apex   Mucronate       Petiole length   2.5 cm       Petiole color   Green 147B                  
 
         [0011]    
       
         
               
             
               
               
               
               
             
           
               
                 TABLE 2 
               
             
             
               
                   
               
               
                   
               
               
                 Differences with the comparison Varieties 
               
             
          
           
               
                   
                 ‘Redock White’ 
                 ‘Redock’ 
                 ‘White Reagan’ 
               
               
                   
               
               
                 Ray-floret color 
                 White 155D 
                 Purple 75 C 
                 White 155D 
               
               
                 Bloom height 
                 High 
                 High 
                 Low 
               
               
                 Cross-section 
                 Strongly concave 
                 Strongly concave 
                 Flat 
               
               
                 of ray-floret 
               
               
                 Vigour 
                 Very vigorous 
                 Very vigorous 
                 Vigorous 
               
               
                 Plant height 
                 125-135 cm 
                 125-135 cm 
                 100-125 cm