Plants – Herbaceous ornamnental flowering plant – Euphorbia
Plant Patent
2002-06-28
2004-06-08
Campell, Bruce R. (Department: 1661)
Plants
Herbaceous ornamnental flowering plant
Euphorbia
Plant Patent
active
PP014868
ABSTRACT:
Genus: Euphorbia.
Species:
seguieriana×nicaeensis.
Denomination: Blue Haze.
BACKGROUND OF THE INVENTION
The present invention relates to a new and distinct cultivar of spurge, a hardy perennial that is grown for use as an ornamental container plant or in mixed perennial borders. The new invention is known botanically as Euphorbia and will be referred to hereinafter by the cultivar name ‘Blue Haze’.
‘Blue Haze’ is a hybrid plant that was discovered by the inventor in July 2000 in a cultivated area of Kilmeston, Alresford, England. ‘Blue Haze’ resulted from the cross between two species of Euphorbia, namely the unnamed female or seed parent
Euphorbia seguieriana
(unpatented) and the unnamed male or pollen parent
Euphorbia nicaeensis
(unpatented). ‘Blue Haze’ was selected by the inventor for its powder-blue foliage and contrasting yellow-green to soft yellow flowers from mid to late summer. Flowers are held on terminal stems and born axial to the leaf joints with two cyathia cupped by two basally fused floral leaves, also called involucres.
‘Blue Haze’ performs best in well-drained soil but will tolerate very poor soils. It is hardy to minus 10° Centigrade in heavy soil and hardy to minus 29° Centigrade when planted in well-drained soil. Well-drained compost or ground soil and high light intensity is required for growing.
The closest comparison plant is the species parent
Euphorbia seguieriana
(not patented). ‘Blue Haze’ is distinguishable from
‘Euphorbia seguieriana’
by having red coloration to the stems, broader leaves and yellower flower bracts. The Euphorbia of this group are considered monoecious. In most Euphorbia the stamens mature after the female parts of the flower.
The first asexual reproduction of ‘Blue Haze’ was accomplished by the inventor using the method of softwood cuttings without bottom heat and was carried out in Kilmeston, Alresford, England in July 2000. Since that time subsequent generations have been determined stable and true to type.
The botanical description of ‘Blue Haze’ was carried out by observing plants during their second season of growth in Arroyo Grande, Calif. Thus the age of the observed plants ranges from 12 months to 15 months.
SUMMARY OF THE INVENTION
The following traits have been repeatedly observed and represent the distinguishing characteristics of the new Euphorbia cultivar. These traits in combination distinguish ‘Blue Haze’ from all other existing varieties of Euphorbia. ‘Blue Haze’ has not been tested under all possible conditions and phenotypic differences may be observed with variations in environmental, climatic, and cultural conditions, however, without any variance in genotype.
1. Euphorbia ‘Blue Haze’ exhibits a clumping habit.
2. Euphorbia ‘Blue Haze’ exhibits soft-yellow flowers in summer.
3. Euphorbia ‘Blue Haze’ exhibits red tinted stems.
4. Euphorbia ‘Blue Haze’ exhibits powder-blue glaucous foliage with pink tints during cooler temperatures.
5. Euphoribia ‘Blue Haze’ reaches 46 cm. in height and 61 cm. in width.
6. Euphorbia ‘Blue Haze’ is hardy to minus 29° Centigrade.
Campell Bruce R.
Krawczewicz Myers Louanne
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