Denomination: 'USMECA67'
Trade name: Goldflake
Botanical Name: Mecardonia
Applicant/Holder: Plant 21 LLC
32149 Aquaduct Road
Bonsall, California
United States of America
Breeder: Ushio Sakazaki, Shiga, Japan
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2003-08-29
Application Number: 03-3836
Grant of Rights Date: 2008-08-29
Certificate Number: 3302
Date rights surrendered: 2009-08-25

Variety Description

Variety used for comparison: Mecardonia grandiflora

Summary: 'USMECA67' has thinner stems and denser branching than plants of Mecardonia grandiflora. 'USMECA67' has smaller leaves, a shorter calyx and darker flower colour than plants of Mecardonia grandiflora.


PLANT: trailing/spreading growth habit, dense branching
STEM: thin, weak anthocyanin colouration at tips, no stem wings

LEAVES: simple, elliptic to ovate, serrate margin, medium number of serrations, light to medium green, no variegation, no pubescence

FLOWER: very weak anthocyanin colouration in pedicel, strong reflexing of corolla lobes, yellow with dark violet veins on upper side of lobes.

Origin & Breeding History: 'USMECA67' originated from a cross made in Hikone, Japan in 1999 between a Mecardonia caespitosa plant as the female parent and a Mecardonia dianthera plant as the male parent. The F1 seed was collected and sent to EuroAmerican Propagators in Bonsall, California, USA for further breeding and selection. The new Mecardonia variety was selected as a single plant from the resultant progeny on June 10, 2000. Selection criteria included good vigour, excellent plant habit and flower colour.

Tests & Trials: Tests and trials were conducted in a polyhouse during the summer of 2007 in St. Thomas, Ontario. The trial included a total of 15 plants of each variety. All plants were grown from rooted cuttings and transplanted into 15 cm pots on May 8, 2007. Observations and measurements were taken from 10 plants of each variety on June 27-28, 2007. All colour measurements were made using the 2001 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'USMECA67' with reference variety Mecardonia grandiflora

Leaf length (cm)

  'USMECA67' Mecardonia grandiflora
mean 3.0 5.4
std. deviation 0.34 0.48

Leaf width (cm)

  'USMECA67' Mecardonia grandiflora
mean 1.9 2.4
std. deviation 0.20 0.21

Calyx length (mm)

  'USMECA67' Mecardonia grandiflora
mean 9.8 14.9
std. deviation 0.63 1.20

Colour of corolla (RHS)

  'USMECA67' Mecardonia grandiflora
upper side 9A (brighter than) 9B

Click on image for larger view
Mecardonia: 'USMECA67' (left) with reference variety Mecardonia grandiflora (right)

Click on image for larger view
Mecardonia: 'USMECA67' (left) with reference variety Mecardonia grandiflora (right)

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