Denomination: 'RP1'
Previously Proposed Denomination: 'RP#1'
Botanical Name: Coreopsis
Applicant/Holder: The Ivy Farm
P.O. Box 116
22511 Rose Cottage Road
Locustville, Virginia
United States of America
Breeder: Harini Korlipara, Terra Nova Nurseries, Inc., Canby, United States of America
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2007-03-28
Application Number: 07-5802
Grant of Rights Date: 2008-08-29
Certificate Number: 3339
Date rights surrendered: 2013-09-24

Variety Description

Variety used for comparison: 'Limerock Dream'

Summary: The coreopsis variety 'RP1' has a very compact, mounding growth habit, compared with the reference variety 'Limerock Dream' which has an upright, open habit and significantly taller plants. 'RP1' has shorter leaves and smaller flower head diameter than 'Limerock Dream'. The ray florets of 'RP1' are short and have a yellow secondary colour at the base whereas the ray florets of Limerock Dream' are longer and have no secondary colour.


PLANT: mounding, compact habit, dense branching
STEM: medium to dark green, absent or very weak anthocyanin colouration, absent or very sparse pubescence, very thin, smooth

LEAF BLADE: linear, acute apex, attenuate base, entire margin, very sparse pubescence (only along margins on upper and lower side), very weak glaucosity, dark green upper side, medium to dark green lower side, no petiole

PEDUNCLE: absent or very weak anthocyanin colouration, absent or very sparse pubescence
FLOWER HEAD: erect, small diameter, few ray florets (8)
RAY FLORET: open to touching, weak longitudinal curvature, three lobed at apex, no recurvature at tip, absent or very sparse pubescence on lower side, obovate shape, brown purple with yellow at base, fading to all yellow
DISC: present, small

Origin & Breeding History: The variety 'RP1' is the product of a planned breeding program developed by the breeder in Canby, Oregon. The new variety originated as a whole plant tissue-culture mutation of the Coreopsis variety 'Rum Punch'. The mutation was discovered by the breeder in February, 2006. The new variety 'RP1' was selected based on its extremely low, compact habit, excellent vigour and numerous, small, copper-coloured, daisy-like flowers.

Tests & Trials: Trials for 'RP1' were conducted in a polyhouse during the summer of 2007 at St. Thomas, Ontario. The trial included 15 plants of the candidate and reference varieties. All plants were grown from rooted cuttings planted into 6.4 cm pots and transplanted into 11.4 cm pots on May 28, 2007. Observations and measurements were taken from 10 plants of each variety on August 14, 2007. All colour determinations were made using the 2001 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'RP1' with reference variety 'Limerock Dream'

Plant height (cm)

  'RP1' 'Limerock Dream'
mean 13.5 31.5
std. deviation 1.28 2.52

Leaf blade length (cm)

  'RP1' 'Limerock Dream'
mean 2.5 4.9
std. deviation 0.57 0.61

Flower diameter (cm)

  'RP1' 'Limerock Dream'
mean 1.7 3.6
std. deviation 0.16 0.36

Ray floret length (cm)

  'RP1' 'Limerock Dream'
mean 0.7 1.5
std. deviation 0.07 0.26

Colour of upper side of ray floret (RHS)

  'RP1' 'Limerock Dream'
fully open 185B to 184C with 4A at base 163B/14B with streaks of 60B
aged 4A with faded tones of 164C 3A

Colour of lower side of ray floret (RHS)

  'RP1' 'Limerock Dream'
main colour 174D to 181C 162B with streaks of 185D at apex
secondary colour 4B at base n/a

Click on image for larger view
Coreopsis: 'RP1' (left) with reference variety 'Limerock Dream' (right)

Click on image for larger view
Coreopsis: 'RP1' (left) with reference variety 'Limerock Dream' (right)

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