Helleborus plant named ‘COSEH 4200’

Abstract

A new and distinct cultivar of Helleborus plant named ‘COSEH 4200’, characterized by its upright and mounding plant habit; uniform and freely flowering habit; dark green-colored leaves; freely and early flowering habit; single pink-colored flowers; and good garden performance.

Claims

1. A new and distinct Helleborus plant named ‘COSEH 4200’ 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 is a side perspective view of a typical flowering plant of ‘COSEH 4200’ grown in a container.

(3) The photograph on the second sheet is a close-up view of a typical flower of ‘COSEH 4200’.

DETAILED BOTANICAL DESCRIPTION

(4) The aforementioned photographs and following observations, measurements and values describe plants grown during the autumn and winter in 15-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 3° C. to 18° C. Plants were 16 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×ericsmithii×Helleborus×hybridus ‘COSEH 4200’. Parentage: Female, or seed, parent.—Proprietary selection of Helleborus×ericsmithii identified as code number HE 10843, not patented. Male, or pollen, parent.—Unnamed seedling selection of Helleborus×hybridus, not patented. Propagation: Type.—By tissue culture. Time to initiate roots, winter.—About two months at temperatures about 12° C. Time to produce a rooted young plant, winter.—About six months 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.—Sparse. Plant description: Plant and growth habit.—Herbaceous perennial; upright and mounding plant habit with flowers held just above and beyond the foliar plane; plant shape, roughly flattened globular; moderately vigorous growth habit; moderate growth rate. Plant height, soil level to top of foliar plane.—About 24.2 cm. Plant height, soil level to top of flowers.—About 35.5 cm. Plant diameter (area of spread).—About 50.5 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 22.6 cm. Leaf width.—About 25.3 cm. Leaflet length.—About 14 cm. Leaflet width.—About 7.5 cm. Leaf shape.—Palmate; reniform in outline. Leaflet shape.—Ovate, elliptic and obovate. Leaflet apex.—Apiculate. Leaflet base.—Attenuate. Leaflet margin.—Serrate; strongly undulate. Leaflet texture and luster, upper surface.—Smooth, glabrous; slightly rugose; leathery; glossy. Leaflet texture and luster, lower surface.—Smooth, glabrous; slightly rugose; leathery; moderately glossy. Leaflet venation pattern.—Pinnate. Leaflet color.—Developing leaflets, upper surface: Close to 137B. Developing leaflets, lower surface: Close to 148A. Fully developed leaflets, upper surface: Close to darker than between 139A and N189A; venation, close to 143B. Fully developed leaflets, lower surface: Close to 147B; venation, close to between N186C and 200B. Petioles.—Length: About 14.1 cm. Diameter: About 8 mm. Strength: Strong. Texture and luster, upper and lower surfaces: Smooth, glabrous; moderately glossy. Color, upper and lower surfaces: Close to 144C, heavily speckled and tinged with close to N200B. Flower description: Flower shape and habit.—Single rotate flowers arranged solitary or in panicles; freely and uniform flowering habit with about five flowers per inflorescence and about 75 flowers developing per plant; flowers facing outwardly to slightly nodding. Fragrance.—None detected. Natural flowering season.—Plants begin flowering about ten months after planting; plants flower during the winter in Germany. Flower longevity on the plant.—About ten days; flowers not persistent. Flower buds.—Length: About 2 cm. Diameter: About 1.3 cm. Shape: Ovate. Texture and luster: Glabrous; matte. Color: Close to 145D; towards the apex, close to 182C to 182D; venation, close to 182C to 182D. Inflorescence height.—About 34.1 cm. Inflorescence diameter.—About 20.4 cm. Flower diameter.—About 8.1 cm. Flower depth (height).—About 2.8 cm. Petals.—Transformed into nectaries. Sepals.—Quantity and arrangement: About five, arranged in a single whorl. Length: About 4.1 cm. Width: About 3.7 cm. Shape: Broadly ovate. Apex: Obtuse. Base: Cuneate. Margin: Entire; slightly to moderately undulate. Texture and luster, upper and lower surfaces: Glabrous; matte. Color: When opening, upper surface: Close to 157D; towards the apex, slightly tinged with close to 182D. When opening, lower surface: Close to 157D; towards the apex, slightly tinged with close to 182D; venation, close to 182D. Fully opened, upper surface: Close to N155B; toward the margins and apex, tinged with close to 186B to 186D; with development, color becoming closer to N187B and 144A. When opening, lower surface: Close to NN155A; towards the margins and apex, tinged with close to 186B to 186D; with development, color becoming closer to N77C. Flower bracts.—Quantity per flower: Typically one. Length: About 4.1 cm. Width: About 3 cm. Shape: Ovate. Apex: Acute. Base; Broadly cuneate. Margin: Entire; distally, occasionally serrated; slightly undulate. Color, upper surface: Close to 137B. Color, lower surface: Close to 148A; venation, close to between N186C and 200C. Peduncles.—Length: About 27.7 cm. Diameter: About 8 mm. Aspect: About 20° from vertical. Strength: Strong. Texture and luster: Glabrous; moderately glossy. Color: Close to 144C, heavily speckled and flushed with close to 177A. Pedicels.—Length: About 3.9 cm. Diameter: About 2 mm. Aspect: About 20° from peduncle axis. Strength: Moderately strong. Texture and luster: Glabrous; glossy. Color: Close to 177B. Reproductive organs.—Stamens: Quantity per flower: About 90. Filament length: About 1.8 cm. Filament color: Close to NN155C. Anther shape: Reniform; basifixed. Anther size: About 2 mm by 3 mm. Anther color: Close to 150C. Pollen amount: Scarce. Pollen color: Close to 4D. Pistils: Quantity per flower: About five. Pistil length: About 1.5 cm. Stigma diameter: About 0.3 mm. Stigma shape: Club-shaped. Stigma color: Close to 150D. Style length: About 1.475 cm. Style color: Close to 186C to 186D. Ovary color: Close to 150D. Nectaries (transformed petals): Quantity per flower: About 13 to 15. Length: About 1.2 cm. Diameter: About 3 mm. Shape: Tubular, flattened. Texture and luster, inner surface: Smooth, glabrous; matte. Texture and luster, outer surface: Smooth, glabrous; glossy. Color, immature, inner and outer surfaces: Close to 144B to 144C; towards the apex, close to N144B. Color, mature, inner and outer surfaces: Close to 144B to 144C; towards the apex, close to 151B. Seeds and fruits.—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 and to be suitable for USDA Hardiness Zones 5 through 9. Pathogen & pest resistance: Plants of the new Helleborus have not been observed to be resistant to pathogens and pests common to Helleborus plants.