Patent Publication Number: US-PP28951-P3

Title: Campanula plant named ‘PKM05’

Description:
Latin name of genus and species of the plant claimed:  Campanula  hybrid. 
     Variety denomination: ‘PKM05’. 
     BACKGROUND OF THE INVENTION 
     The present invention relates to a new and distinct cultivar of  Campanula  hybrid plant, and hereinafter referred to by the name ‘PKM05’. 
     The new  Campanula , ‘PKM05’, is a product of a planned breeding program conducted by the inventor, Christian Hald Madsen, in Søhus, Denmark. The new  Campanula  originated from a planned cross between two different  Campanula  species; the female parent being an unnamed, proprietary  Campanula  variety (unpatented) and the male parent being an unnamed, proprietary  Campanula  variety (unpatented). The initial crossing was performed in May 2013 by the Inventor, followed by further testing after vegetative propagation since then. The inventor selected ‘PKM05’ on the basis of white double flowers. 
     Asexual reproduction of the new  Campanula  cultivar by terminal cuttings has demonstrated that the combination of characteristics as herein disclosed for the new cultivar are firmly fixed and retained through successive generations of asexual reproduction. The new cultivar reproduces true-to-type. 
     SUMMARY OF THE INVENTION 
     The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘PKM05’. These characteristics in combination distinguish ‘PKM05’ as a new and distinct cultivar:
         1. Upright plant habit with stiff stems.   2. Bushy globular plant form.   3. Vigorous growth habit, but still needing less chemical growth retardation.   4. Double white flowers.   5. No need for vernalization.       

     Plants of the cultivar ‘PKM05’ can be compared to the unpatented cultivar  Campanula×haydlodgensis  ‘White Wonder’. In side-by-side comparisons conducted by the inventor in Søhus, Denmark, plants of the instant cultivar ‘PKM05’ and plants of the cultivar ‘White Wonder’ differ in the following characteristics:
         1. Plants of ‘PKM05’ have larger flowers than ‘White Wonder’.   2. Plants of ‘PKM05’ have larger leaves than ‘White Wonder’.   3. Plants of ‘PKM05’ have a more upright plant habit than ‘White Wonder’.       

     Data on plants of the parent varieties are no longer available for comparison with plants of the new cultivar  Campanula  ‘PKM05’. 
    
    
     
       BRIEF DESCRIPTION OF THE PHOTOGRAPHS 
       The accompanying colored photographs illustrate the overall appearance of the new  Campanula  ‘PKM05’, showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description, which more accurately describe the actual colors of ‘PKM05’. Plants in the photographs are shown 3 months after propagation. 
         FIG. 1  comprises a side perspective view of a typical flowering plant of ‘PKM05’ grown in a 10.5 cm pot. 
         FIG. 2  comprises a close-up view of inflorescence of ‘PKM05’. 
         FIG. 3  comprises a close-up view of flowers of ‘PKM05’. 
         FIG. 4  comprises a close-up view of major laterals, buds, and flowers of ‘PKM05’. 
         FIG. 5  comprises views of buds and flowers of ‘PKM05’ at various stages of opening. 
     
    
    
     DETAILED BOTANICAL DESCRIPTION 
     The new  Campanula  ‘PKM05’ has not been observed under all possible environmental conditions. The phenotype of the new cultivar may vary with variations in environment such as growth regulator treatment, temperature, light intensity, day length, and fertility level without any variance in genotype. 
     The aforementioned photographs, together with the following observations, measurements and values describe plants of the new  Campanula  ‘PKM05’ as grown under greenhouse conditions. 
     The age of the ‘PKM05’ plants described is 3 months after propagation. Color references are made to The Royal Horticultural Society Colour Chart (R.H.S.), 5 th  edition, 2007, except where general colors of ordinary significance are used.
     Classification:
             Botanical.—Campanula  interspecific hybrid.       
       Parentage:
             Female or seed parent.—Campanula  unpatented proprietary selection.     Male or pollen parent.—Campanula  unpatented proprietary selection.       
       Propagation:
             Type cutting .—Terminal vegetative cuttings.     Time to initiate roots .—About 10 to 14 days at 18 to 21° C. in tunnels in a greenhouse.     Root description .—Fine, well branched.       
       Plant description:
             Form .—Upright plant habit. Double to filled wide campanulate flowers in panicles. Freely branching with lateral branches forming at every node.     Crop time .—After rooting, about 12 weeks are required to produce finished flowering plants in 10.5 cm pots.     Plant height  ( from soil level to top of plant plane ).—About 18 cm. Depending on growth conditions.     Plant spread .—Up to 25 cm, depending on growth conditions.     Vigor .—Vigorous growth rate.       
       Lateral branches (stem):
             Length .—Up to 20 cm.     Internode length .—From 1.5 to 4 cm, up to 10 nodes.     Color .—Between RHS 137B and 137C, green.     Diameter .—Up to 5 mm.     Strength .—Stiff.     Lactate .—Present.       
       Foliage description:
             Leaf shape .—Single, dentate, cordate, palmate venation.     Leaf length .—Up to 4 cm.     Leaf width .—Up to 4 cm.     Number .—Up to 10 per lateral branch.     Arrangement .—Alternate.     Apex .—Acute.     Base .—Cordate.     Margin .—Broadly dentate, undulate.     Texture .—Glabrous on upper and lower surfaces; stiff.     Color .—Upper Surface, RHS N137A, Green. Lower Surface, between RHS 137B and 137C (Green).     Venation color .—Lighter green than or similar to leaf blade, but areas too small to determine R.H.S. values.     Variegation .—Absent.     Petiole .—Length: Up to 6 cm. Diameter: Up to 3 mm. Color: Between RHS 137B and 137C (green).       
       Inflorescence description:
             Flower arrangement and shape .—Single, upright, double to filled flowers in panicles with many flowers at lateral branches, flowers with star shaped calyx.     Natural flowering season .—Continuous throughout spring and summer. Season can be extended through long day treatments, no vernalization needed.     Flower longevity .—Individual flowers up to three weeks. Flowers persistent.     Inflorescence size .—Length: up to 17 cm.     Flowers .—Length: About 2 cm. Diameter: About 4 cm. Layers of corollas: 3-4. Number per inflorescence: 5-8, depending on growth conditions. Shape: Wide campanulate. Fragrance: None. Petals: Number: 5, fused to form corolla. Margin: Entire. Texture: Glabrous, both upper and lower surface.     Corolla .—Length of tube: 20 mm. Length of lobe: 10 mm. Width of lobe: 15 mm. Tip of lobe: acute and twisted. Curvature: As flowers fill/double the curvature varies between weakly reflexing, straight, and weakly incurving.     Corolla color .—Upper and Lower surfaces, 155D, white.     Petaloid lobes .—Absent.     Sepals .—Arrangement: Free and sessile. Quantity per flower: 5. Length: 10 mm. Width: 3 mm. Overall shape: Triangular. Tip: Acute. Margin: Entire. Texture: Glabrous, both upper and lower surface. Color (mature and immature): Upper and lower surfaces: Green (areas too small to give R.H.S. values). Pedicel: Length: up to 7 mm. Diameter: up to 2 mm. Color: Green, RHS N137A. Buds: Shape: Obovate, pyriforme to subglobose, rosulate when opening. Color: Initially RHS 158D; RHS 155D when open.       
       Reproductive organs:
             Gynoecium .—Pistil and Stigma: Shape: Tripartite, can be malformed. Color: White green tip before opening; area too small to determine R.H.S. value. Style: Color: White, RHS 155D. Length: Up to 2 cm. Ovary. Color: RHS N137A, Green.     Androecium.—       Stamen .—Often absent/malformed.     Anther .—Number: Up to 5. Color: Pale yellow, area too small to determine R.H.S. value. Length: 2-3 mm.     Filaments .—Color: White, RHS 155D. Length: Up to 12 mm.     Pollen .—Amount: Mostly absent. Color: Pale yellow, too scarce to determine R.H.S. value.       
       Temperature tolerance: Not tested.   Pest/disease tolerance: Not tested.