Denomination: 'RP4'
Previously Proposed Denomination: 'RP#4'
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: 07-5803
Grant of Rights Date: 2008-08-29
Certificate Number: 3340
Date rights surrendered: 2013-09-24

Variety Description

Varieties used for comparison: 'Rum Punch' and 'RP5'

Summary: The coreopsis variety 'RP4' has longer leaf blades than the reference varieties 'Rum Punch' and 'RP5'. The main difference between 'RP4' and the reference varieties is flower colour. 'RP4' also has a mixture of ray floret types, with numerous flowers on each plant that have tubular ray florets, whereas 'Rum Punch' and 'RP5' do not have tubular shaped ray florets.


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

LEAF BLADE: linear, acute apex, attenuate base, entire margin, absent or very sparse pubescence, very weak glaucosity, dark green upper side, medium green lower side, no petiole

PEDUNCLE: absent or very weak anthocyanin colouration, very sparse pubescence
FLOWER HEAD: erect, small diameter, few ray florets (8)
RAY FLORET: very open to touching, slightly incurving, obovate and some tubular type, emarginate to dentate apex, yellow with brown red overlay, sparse pubescence on lower side
DISC: present

Origin & Breeding History: The variety 'RP4' 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 'RP4' was selected based on its low, mounding habit, excellent vigour and unique, rusty yellow, daisy-like flowers.

Tests & Trials: Trials for 'RP4' 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 'RP4' with reference varieties 'Rum Punch' and 'RP5'

Leaf blade length (cm)

  'RP4' 'Rum Punch' 'RP5'
mean 5.0 3.6 3.7
std. deviation 0.42 0.26 0.48

Diameter of flower head (cm)

  'RP4' 'Rum Punch' 'RP5'
mean 3.3 3.7 2.8
std. deviation 0.27 0.22 0.27

Colour of ray floret (RHS)

  'RP4' 'Rum Punch' 'RP5'
upper side 3A with 179A/180B at apex 163B/14B with streaks of 60B N163B with 180B/179B (12A/14B at base)
lower side 5C-D with 180D at apex 161B with streaks of 170C 164C with streaks of 182D

Click on image for larger view
Coreopsis: 'RP4' (left) with reference varieties 'Rum Punch' (centre) and 'RP5' (right)

Click on image for larger view
Coreopsis: 'RP4' (left) with reference varieties 'Rum Punch' (centre) and 'RP5' (right)

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