plant named ‘HL 1046’

Abstract

A new and distinct cultivar of Helleborus plant named ‘HL 1046’ characterized by its upright to somewhat outwardly spreading and mounded plant habit; moderately vigorous to vigorous growth habit; dark green-colored leaflets with lighter green-colored venation; freely flowering habit; white-colored flowers; and good garden performance.

Description

Botanical designation: Helleborus niger X Helleborus x hybridus.

Cultivar denomination: ‘HL 1046’.

STATEMENT REGARDING PRIOR DISCLOSURES BY INVENTOR/APPLICANT

An European Community Plant Breeder's Rights application for the instant plant was filed by the Inventor/Applicant, Mr. Josef Heuger of Glandorf, Germany, on Dec.1, 2022, application number 2022/2778. Foreign priority is not claimed to this application.

The Inventor/Applicant asserts that no publications nor advertisements relating to sales, offers for sale or public distribution occurred more than one year prior to the effective filing date of this application. Any information about the claimed plant would have been obtained from a direct or indirect disclosure from the Inventor or Applicant. Inventor/Applicant claims a prior art exception under 35 U.S.C. 102(b)(1) for disclosure and/or sales prior to the filing date but less than one year prior to the effective filing date.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of Helleborus plant, botanically known as Helleborus niger X Helleborus x hybridus and hereinafter referred to by the name ‘HL 1046’.

The new Helleborus plant is a product of a planned breeding program conducted by the Inventor in Glandorf, Germany. The objective of the breeding program was to create new uniform Helleborus plants with unique and attractive plant habit, leaf and flower coloration and tolerance to biotic and abiotic stresses.

The new Helleborus plant originated from a cross-pollination conducted by the Inventor in Glandorf, Germany in December, 2015 of a proprietary selection of Helleborus niger identified as code number P881, not patented, as the female, or seed, parent and a proprietary selection of Helleborus x hybridus identified as code number O1824, not patented, as the male, or pollen, parent. The new Helleborus plant was discovered and selected by the Inventor as a single flowering plant from within the progeny of the stated cross-pollination grown in a controlled greenhouse environment in Glandorf, Germany in December, 2017.

Asexual reproduction of the new Helleborus plant by in vitro axillary meristem culture in a controlled environment in Glandorf, Germany since April, 2018 has shown that the unique features of this new Helleborus plant are stable and reproduced true to type in successive generations.

SUMMARY OF THE INVENTION

Plants of the new Helleborus have not been observed under all possible combinations of environmental conditions and cultural practices. The phenotype may vary somewhat with variations in environmental conditions such as temperature and light intensity without, however, any variance in genotype.

The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘HL 1046’. These characteristics in combination distinguish ‘HL 1046’ as a new and distinct Helleborus plant:

• • 1. Upright to somewhat outwardly spreading and mounded plant habit.
  • 2. Moderately vigorous to vigorous growth habit.
  • 3. Dark green-colored leaflets with lighter green-colored venation.
  • 4. Freely flowering habit.
  • 5. White-colored flowers.
  • 6. Good garden performance.

Plants of the new Helleborus differ from plants of the female parent selection in the following characteristics:

• • 1. Leaflets of plants of the new Helleborus are darker green in color than leaflets of plants of the female parent selection.
  • 2. Flowers of plants of the new Helleborus are less white in color than flowers of plants of the female parent selection.

Plants of the new Helleborus differ from plants of the male parent selection in the following characteristics:

• • 1. Leaflets of plants of the new Helleborus are darker green in color than leaflets of plants of the male parent selection.
  • 2. Flowers of plants of the new Helleborus are more white in color than flowers of plants of the male parent selection.

Plants of the new Helleborus can also be compared to plants of Helleborus niger ‘COSEH 240’, not patented. In side-by-side comparisons, plants of the new Helleborus differ primarily from plants of ‘COSEH 240’ in the following characteristics:

• • 1. Leaves of plants of the new Helleborus are larger than leaves of plants of ‘COSEH 240’.
  • 2. Flowers of plants of the new Helleborus are larger than flowers of plants of ‘COSEH 240’.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying colored photographs illustrate the overall appearance of the new Helleborus plant 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 accurately describe the colors of the new Helleborus plant.

The photograph on the first sheet (FIG. 1) is a side perspective view of a typical flowering plant of ‘HL 1046’ grown in a container.

The photograph on the second sheet (FIG. 2) is a close-up view of a typical flower of ‘HL 1046’.

DETAILED BOTANICAL DESCRIPTION

The aforementioned photographs and following observations, measurements and values describe plants grown during the autumn in 17-cm containers in a glass-covered greenhouse in Glandorf, Germany and under cultural practices typical of commercial Helleborus production. During the production of the plants, day temperatures ranged from 12C to 32C and night temperatures ranged from 5C to 12C. Plants were 48 weeks old when the photographs were taken and 14 months old when the description was taken. In the following description, color references are made to The Royal Horticultural Society Colour Chart, 2015 Edition, except where general terms of ordinary dictionary significance are used.

• Botanical classification: Helleborus niger X Helleborus x hybridus ‘HL 1046’.
• Parentage:
  • • Female, or seed, parent.—Proprietary selection of Helleborus niger identified as code number P881, not patented.
    • Male, or pollen, parent.—Proprietary selection of Helleborus x hybridus identified as code number O1824, not patented.
• Propagation:
  • • Type.—In vitro axillary meristem culture.
    • Time to initiate roots, winter.—About 55 days at temperatures about 12C.
    • Time to produce a rooted young plant, winter.—About 170 days at temperatures ranging from about 4C to 15C.
    • Root description.—Thick to thin, fleshy; typically white to brownish in color, actual color of the roots is dependent on substrate composition, water quality, fertilizer type and formulation, substrate temperature and physiological age of roots.
    • Rooting habit.—Low branching; sparse.
• Plant description:
  • • Plant and growth habit.—Herbaceous perennial; upright to somewhat outwardly spreading and mounding plant habit with flowers held within to slightly above the foliar plane; plant shape, flattened globular to globular; moderately vigorous to vigorous growth habit and moderate growth rate.
    • Plant height, soil level to top of foliar plane.—About 25.3 cm.
    • Plant height, soil level to top of flowers.—About 35.4 cm.
    • Plant diameter (area of spread).—About 44.5 cm.
• Leaf description:
  • • Arrangement.—Leaves arranged in a basal rosette; leaves palmately compound with typically five, or occasionally, seven, leaflets per leaf.
    • Leaf length.—About 17.2 cm.
    • Leaf width.—About 19 cm.
    • Leaflet length.—About 10.6 cm.
    • Leaflet width.—About 4.9 cm.
    • Leaf shape.—Palmate; roughly reniform in outline.
    • Leaflet shape.—Elliptic to obovate.
    • Leaflet apex.—Acute.
    • Leaflet base.—Attenuate.
    • Leaflet margin.—Serrate; moderately and coarsely undulate.
    • Leaflet texture and luster, upper and lower surfaces.—Smooth, glabrous; coriaceous and tough; slightly to moderately glossy.
    • Leaflet venation pattern.—Pinnate and reticulate.
    • Leaflet color.—Developing leaflets, upper surface: Close to 137A; at the base, close to 183B. Developing leaflets, lower surface: Close to 147B; towards the base, tinged with close to 178A; midvein, close to 146D. Fully developed leaflets, upper surface: Darker than a blend of NN137A and 147A; at the base, tinged with close 200A; venation, close to 144A. Fully developed leaflets, lower surface: Close to a blend of NN137B and 147B; venation, close to 144A.
    • Petioles.—Length: About 16.8 cm. Diameter: About 7 mm by 8 mm. Strength: Strong. Texture and luster, upper and lower surfaces: Smooth, glabrous; slightly glossy. Color, upper surface: Close to 146C; slightly to moderately covered with fine dots, close to N186B to N186C. Color, lower surface: Close to 144A; slightly to moderately covered with fine dots, close to N186B to N186C.
• Flower description:
  • • Flower shape and habit.—Single rotate bowl-shaped flowers arranged in panicles; freely flowering habit with about three to four flowers per inflorescence and about 36 flowers and flower buds per plant; flowers face mostly outwardly.
    • Fragrance.—None detected.
    • Natural flowering season.—Plants begin flowering about ten months after planting; plants flower naturally from late autumn into the winter in Germany.
    • Flower longevity on the plant.—About ten days; sepals persistent, other flower parts are not persistent.
    • Flower buds.—Length: About 2.6 cm. Diameter: About 1.4 cm. Shape: Ovate. Texture and luster: Smooth, glabrous; slightly glossy. Color: Close to 157A.
    • Inflorescence height (including peduncle).—About 32.1 cm.
    • Inflorescence diameter.—About 13.1 cm.
    • Flower diameter.—About 9.4 cm.
    • Flower depth.—About 2.5 cm.
    • Petals.—All petals are transformed into nectaries.
    • Sepals.—Quantity and arrangement: About five arranged in a single whorl. Length: About 5.3 cm. Width: About 4.3 cm. Shape: Broadly ovate; slightly concave. Apex: Broadly and bluntly acute to close to obtuse. Base: Cuneate. Margin: Entire; not undulate. Texture and luster, upper and lower surfaces: Smooth, glabrous; slightly glossy. Color: When opening, upper surface: Close to NN155B to NN155C; at the base, close to 145B. When opening, lower surface: Close to 155C; at the base, close to 145B. Fully opened, upper surface: Close to NN155B; towards the apex, occasionally tinged with close to 145A and 145B; at the base, close to 145B; venation, similar to lamina colors; color does not change with subsequent development. Fully opened, lower surface: Close to NN155B; towards the apex, occasionally tinged with close to 145A and 145B; at the base, close to 146D; venation, similar to lamina colors; color does not change with subsequent development.
    • Flower bracts.—Quantity per flower: Typically one. Length: About 7.7 cm. Width: About 5.7 cm. Shape: Ovate to obovate. Apex: Acute to three-lobed. Base: Truncate to cuneate. Margin: Mostly entire; distally, occasionally serrate; coarsely undulate. Color, upper surface: Close to NN137A; towards the base, close to 145A to 145B; midvein, occasionally tinged with close to 187B. Color, lower surface: Close to 147B; midvein, tinged with close to 187A.
    • Peduncles.—Length: About 23.9 cm. Diameter: About 8 mm to 9 mm. Aspect: About 10 degrees from vertical. Strength: Strong. Texture and luster: Smooth, glabrous; moderately glossy. Color: Close to 146D; moderately to heavily covered with fine dots, close to 187A to 187C.
    • Pedicels.—Length: About 2.8 cm. Diameter: About 3.5 mm. Aspect: About 25 degrees from peduncle axis. Strength: Moderately strong. Texture and luster: Smooth, glabrous; slightly glossy. Color: Close to 146D; moderately to heavily covered with fine dots, close to 187D.
    • Reproductive organs.—Stamens: Quantity per flower: About 120. Filament length: About 1.5 cm. Filament color: Close to NN155A to NN155B. Anther shape: Double and broadly reniform; basifixed. Anther size: About 2 mm by 3 mm. Anther color: Close to 154C. Pollen amount: Sparse to moderate. Pollen color: Close to 4D to lighter than 4D.
    • Pistils.—Quantity per flower: About six to eight. Pistil length: About 1.1 cm. Stigma diameter: About 0.3 mm. Stigma shape: Club-shaped. Stigma color: Close to 156D. Style length: About 1.05 cm. Style color: Close to 186B; proximally, close to 157D. Ovary color: Close to 145B.
    • Nectaries (transformed petals).—Quantity per flower: About 16 to 19. Length: About 1 cm. Diameter: About 4 mm. Shape: Tubular, flattened; apices, obtuse. Texture and luster, inner and outer surfaces: Smooth, glabrous; slightly glossy. Color, immature, inner and outer surfaces: Close to 144C; towards the apex, close to 145B. Color, mature, inner and outer surfaces: Close to N144C; towards the apex, close to N144A; venation, similar to lamina colors; with subsequent development, main color becoming closer to 151A, towards the apex, closer to 153C and at the base, closer to 146C.
    • Seeds and fruits.—To date, seed and fruit development have not been observed on plants of the new Helleborus.
• Garden performance: Plants of the new Helleborus have been observed to have good garden performance and to tolerate rain, wind, high temperatures about 35C and to be suitable for USDA Hardiness Zones 5 through 9.
• Pathogen & pest resistance: To date, plants of the new Helleborus have not been observed to be resistant to pathogens and pests common to Helleborus plants.

Claims

1. A new and distinct Helleborus plant named ‘HL 1046’ as illustrated and described.