<i>Helleborus </i>plant named ‘COSEH 5700’

Abstract

A new and distinct cultivar of Helleborus plant named COSEH 5700, characterized by its compact, upright and mounded plant habit; moderately vigorous growth habit; dark green-colored leaves; freely flowering habit; single red purple-colored flowers; and good garden performance.

Claims

1. A new and distinct Helleborus plant named COSEH 5700 as illustrated and described.

Description

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

(1) 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.

(2) The photograph on the first sheet (FIG. 1 of 2) is a side perspective view of a typical flowering plant of COSEH 5700 grown in a container.

(3) The photograph on the second sheet (FIG. 2 of 2) is a close-up view of typical flowers and leaves of COSEH 5700.

DETAILED BOTANICAL DESCRIPTION

(4) The aforementioned photographs and following observations, measurements and values describe plants grown during December 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 12 C. to 32 C. and night temperatures ranged from 5 C. to 12 C. Plants were 14 months old when the photographs and the description were 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 COSEH 5700. Parentage: Female, or seed, parent.Unnamed selection of Helleborus niger, not patented. Male, or pollen, parent.Unnamed selection of Helleborus x hybridus, not patented. Propagation: Type.In vitro axillary meristem culture. Time to initiate roots, winter.About 55 days at temperatures about 12 C. Time to produce a rooted young plant, winter.About 170 days at temperatures ranging from 4 C. to 15 C. Root description.Thick to thin, fleshy; typically white to brown 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; compact, upright and mounding plant habit with flowers held within and above the foliar plane; plant shape, roughly flattened globular; moderately vigorous growth habit and low to moderate growth rate. Plant height, soil level to top of foliar plane.About 21.7 cm. Plant height, soil level to top of flowers.About 23.9 cm. Plant diameter (area of spread).About 32 cm. Leaf description: Arrangement.Leaves arranged in a basal rosette; leaves palmately compound with typically seven or occasionally nine leaflets per leaf. Leaf length.About 14.6 cm. Leaf width.About 16.7 cm. Leaflet length.About 9.6 cm. Leaflet width.About 5.9 cm. Leaf shape.Palmate; reniform in outline. Leaflet shape.Broadly elliptic to obovate. Leaflet apex.Acute to broadly acute. Leaflet base.Attenuate. Leaflet margin.Deeply serrate; moderately undulate. Leaflet texture and luster, upper surface.Smooth, glabrous; leathery; moderately glossy. Leaflet texture and luster, lower surface.Smooth, glabrous; leathery; slightly glossy. Leaflet venation pattern.Pinnate. Leaflet color.Developing leaflets, upper surface: Close to NN137B and proximally, tinged with close to 187A. Developing leaflets, lower surface: Close to between 138B and 147B; venation, close to 178B. Fully developed leaflets, upper surface: Darker than between 147A and N189A; venation, close to 147B. Fully developed leaflets, lower surface: Close to 144A to 144B; venation, close to 144B. Petioles.Length: About 8.4 cm. Diameter: About 8 mm to 9 mm. Strength: Strong. Texture and luster, upper and lower surfaces: Smooth, glabrous; slightly glossy. Color, upper and lower surfaces: Close to 144A; proximally, close to 176A to 176B. Flower description: Flower shape and habit.Single rotate flowers; flowers slightly to moderately cupped; arranged solitary or in clusters with about two flowers each; freely flowering habit with about 24 flowers developing per plant; flowers face mostly outwardly to slightly upright and slightly nodding. Fragrance.None detected. Natural flowering season.Plants begin flowering about ten months after planting; plants flower from the late autumn into the winter in Germany. Flower longevity on the plant.About three to four months; sepals persistent, other flower parts are not persistent. Flower buds.Length: About 2.5 cm. Diameter: About 1.8 cm. Shape: Broadly ovate. Texture and luster: Smooth, glabrous; matte. Color: Close to 186C; venation, close to 64B. Inflorescence height.About 9.9 cm. Inflorescence diameter.About 9.6 cm. Flower diameter.About 9.6 cm by 9.6 cm. Flower depth (height).About 3.1 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 5.3 cm. Shape: Broadly ovate, moderately concave. Apex: Obtuse. Base: Truncate. Margin: Entire; moderately undulate. Texture and luster, upper surface: Smooth, glabrous; matte. Texture and luster, lower surface: Smooth, glabrous; slightly glossy. Color: When opening, upper surface: Close to 186D to lighter than 186D densely covered with fine dots, close to 64A to 64B and 186A; venation, similar to lamina color. When opening, lower surface: Close to 186D to lighter than 186D densely covered with fine dots, close to 64A to 64B and 186A; venation, similar to lamina color. Fully opened, upper surface: Close to 75C to 75D densely covered with fine dots, close to 61A and 187D; venation, similar to lamina color; with development, close to 150D densely covered with fine dots, close to 64C. Fully opened, lower surface: Close to 75B to 75C densely covered with fine dots, close to 59C and 61A; venation, similar to lamina color; with development, close to 150D densely covered with fine dots, close to 64B to 64C. Flower bracts.Quantity per flower: Typically one. Length: About 3 cm. Width: About 2.2 cm. Shape: Broadly ovate. Apex: Broadly acute. Base: Truncate. Margin: Finely serrate; moderately undulate. Color, upper surface: Close to 137B to 137C; venation, similar to lamina. Color, lower surface: Close to 138A to 138B; venation, close to 187A. Peduncles.Length: About 17 cm. Diameter: About 7 mm to 11 mm. Aspect: About 10 from vertical. Strength: Strong. Texture and luster: Smooth, glabrous; moderately glossy. Color: Close to 144B; moderately to heavily covered with fine dots, close to 183A to 183B. Pedicels.Length: About 4.3 cm. Diameter: About 3.5 mm. Aspect: Mostly upright. Strength: Moderately strong. Texture and luster: Smooth, glabrous; moderately glossy. Color: Close to 144B heavily covered with fine dots, close to between N186C and 200A. Reproductive organs.Stamens: Quantity per flower: About 120. Filament length: About 1.6 cm. Filament color: Close to 186A. Anther shape: Double and broadly reniform; basifixed. Anther size: About 2 mm by 2 mm. Anther color: Close to 4B. Pollen amount: Moderate. Pollen color: Close to 4D. Pistils: Quantity per flower: About five. Pistil length: About 8 mm. Stigma diameter: About 0.3 mm. Stigma shape: Club-shaped. Stigma color: Close to 150D. Style length: About 7.5 mm. Style color: Close to N186C. Ovary color: Close to 150D. Nectaries (transformed petals): Quantity per flower: About 14. Length: About 1.4 cm. Diameter: About 6 mm. Shape: Tubular, flattened. Texture and luster, inner and outer surfaces: Smooth, glabrous; slightly glossy. Color, immature, inner and outer surfaces: Close to 151D and towards the base, close to 144B. Color, mature, inner and outer surfaces: Close to 146D, distally, close to 151D and proximally, close to 200B; with development, close to 146C, distally, close to 13B and proximally, close to 152C. 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 35 C. 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.