<i>Leucanthemum </i>plant named ‘Sunrimaizy’

Abstract

A new and distinct cultivar of Leucanthemum plant named ‘Sunrimaizy’, characterized by its relatively compact, upright and mounded plant habit; freely branching habit; strong flowering stems; early and freely flowering habit; long flowering period; large semi-double to double-type inflorescences with white-colored ray florets and bright yellow-colored disc florets; no vernalization requirement for flowering; good garden performance and winter hardiness.

Claims

1. A new and distinct Leucanthemum plant named ‘Sunrimaizy’ as illustrated and described.

Description

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

(1) The accompanying colored photographs illustrate the overall appearance of the new Leucanthemum 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 Leucanthemum plant.

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

(3) The photograph on the second sheet (FIG. 2) is a close-up view of a typical flowering plant of ‘Sunrimaizy’.

DETAILED BOTANICAL DESCRIPTION

(4) The aforementioned photographs and following observations and measurements describe plants grown in 1.5-gallon containers during the summer in an outdoor nursery in West Chicago, Ill. and under cultural practices typical of commercial Leucanthemum production. During the production of the plants, day temperatures averaged 24° C. and night temperatures averaged 18° C. Plants were pinched two times and were 25 weeks 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: Leucanthemum x superbum ‘Sunrimaizy’. Parentage: Female, or seed, parent.—Leucanthemum x superbum ‘White Magic’, disclosed in U.S. Plant Pat. No. 29,737. Male, or pollen, parent.—Unknown selection of Leucanthemum x superbum, not patented. Propagation: Type.—Terminal vegetative cuttings. Time to initiate roots, summer.—About ten days at temperatures about 22° C. to 25° C. Time to initiate roots, winter.—About 15 days at temperatures about 16° C. to 18° C. Time to produce a rooted young plant, summer.—About 35 to 40 days at temperatures about 24° C. Time to produce a rooted young plant, winter.—About 50 to 60 days at temperatures about 16° C. to 18° C. Root description.—Medium in thickness, fleshy; typically off-white 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.—Freely branching, dense; rapid root system development. Plant description: Plant and growth habit.—Herbaceous perennial; relatively compact, upright and mounded plant habit; vigorous growth habit; moderate growth rate; freely branching habit with about eight to ten primary branches each with numerous secondary branches developing per plant. Plant height.—About 27.5 cm. Plant width.—About 41 cm. Branch description.—Length: About 24 cm. Diameter, at the base: About 8 mm. Internode length: About 2 cm. Strength: Strong. Aspect: Erect to about 45° from vertical. Texture and luster: Smooth, glabrous; moderately glossy. Color: Close to 144A. Leaf description.—Arrangement: Alternate; simple. Length: About 10.5 cm. Width: About 4 cm. Shape: Lanceolate to oblong. Apex: Acute to sharply acute. Base: Attenuate. Margin: Serrate. Texture and luster, upper and lower surfaces: Smooth, glabrous; moderately glossy. Venation pattern: Prominent midvein; pinnate. Color: Developing leaves, upper surface: Close to 147A. Developing leaves, lower surface: Close to 137A. Fully developed leaves, upper surface: Close to 147A; venation, close to 146A. Fully developed leaves, lower surface: Close to a blend of 147B and 146A; venation, close to 146A to 146B. Petioles: Length: About 3.2 cm. Width: About 6 mm. Texture and luster, upper and lower surfaces: Smooth, glabrous; moderately glossy. Inflorescence description: Appearance.—Large semi-double to double-type inflorescences with ligulate-shaped ray florets and tubular disc florets; inflorescences held upright on strong peduncles, inflorescences face mostly upright; ray and disc florets develop acropetally on a capitulum. Fragrance.—None detected. Flowering response.—Plants begin flowering about twelve weeks after planting; plants flower continuously from the spring into the late summer in Northern Illinois. Postproduction longevity.—Inflorescences maintain good substance for several weeks on the plant; inflorescences persistent. Quantity of inflorescences.—Freely flowering habit, about 50 or more inflorescences develop per plant during the flowering season. Inflorescence size, semi-double inflorescences.—Diameter: About 6.5 cm. Depth (height): About 2 cm. Disc diameter: About 2 cm. Receptacle height: About 6 mm. Receptacle diameter: About 1.2 cm. Receptacle color: Close to 144A to 144B. Inflorescence size, double-type inflorescences.—Diameter: About 6.5 cm. Depth (height): About 2.4 cm. Disc diameter: About 1.2 cm, inconspicuous. Receptacle height: About 5 mm. Receptacle diameter: About 1.5 cm. Receptacle color: Close to 144A to 144B. Inflorescence buds.—Height: About 7 mm. Diameter: About 1.3 cm. Shape: Flattened sphere. Color: Close to 144A. Ray florets, semi-double inflorescences.—Quantity per inflorescence: About 92 arranged in about three or four whorls; interior to the ray florets, a single whorl of smaller ray florets, about 25 to 30 in number. Length: About 2.9 cm. Width: About 7 mm. Shape: Ligulate. Apex: Acute, emarginate or praemorse. Base: Attenuate; fused at the base into a short tube. Margin: Entire; not undulate. Aspect: Mostly flat to slightly twisting; smaller inner ray florets are incurved and more twisting. Texture and luster, upper and lower surfaces: Smooth, glabrous; not rugose; matte. Color: When opening and fully opened, upper surface: Close to 149D; fused base, close to 144A; color becoming closer to 157D with subsequent development. When opening and fully opened, lower surface: Close to 149D; fused base, close to 144A; color becoming closer to 157D with subsequent development. Ray florets, double-type inflorescences.—Quantity per inflorescence: About 274 arranged in multiple whorls. Length: About 3 cm. Width: About 6 mm to 7 mm. Shape: Ligulate. Apex: Acute, emarginate or praemorse. Base: Attenuate; fused at the base into a short tube. Margin: Entire; not undulate. Aspect: Mostly flat to slightly twisting; smaller inner ray florets are incurved. Texture and luster, upper and lower surfaces: Smooth, glabrous; not rugose; matte. Color: When opening and fully opened, upper surface: Close to 149D; fused base, close to 144A; color becoming closer to 157D with subsequent development. When opening and fully opened, lower surface: Close to 149D; fused base, close to 144A; color becoming closer to 157D with subsequent development. Disc florets, semi-double and double-type inflorescences.—Quantity per inflorescence, semi-double inflorescences: About 275 massed at the center of the receptacle arranged in numerous whorls. Quantity per inflorescence, double-type inflorescences: About 64 massed at the center of the receptacle arranged in several variable whorls; inconspicuous. Length: About 8 mm. Diameter: Proximally, about 1 mm and distally, about 1.5 mm. Shape: Fused tubular with apices free. Apex: Acute, five-pointed. Texture and luster, inner and outer surfaces: Smooth, glabrous; slightly glossy. Color, when opening and fully opened, inner surface: Apex: Darker than 12A. Mid-section and base: Close to 144A. Involucral bracts, semi-double and double-type inflorescences.—Quantity per inflorescence, semi-double inflorescences: About 48 arranged in about two to three whorls. Quantity per inflorescence, double-type inflorescences: About 72 arranged in about two to three whorls. Length: About 1.1 cm. Width: About 2.5 mm to 3 mm. Shape: Oblong. Apex: Acute with obtuse tendencies. Base: Fused to the base of the receptacle. Margin: Entire, membraneous. Texture and luster, upper and lower surfaces: Smooth, glabrous; somewhat glossy. Color, upper and lower surfaces: Close to 144A. Peduncles, semi-double and double-type inflorescences.—Length: About 24 cm. Diameter, at the base: About 8 mm. Strength: Strong. Aspect: Upright to about 45° from vertical. Texture and luster: Smooth, glabrous; moderately glossy. Color: Close to 144A. Reproductive organs, semi-double and double-type inflorescences.—Androecium: Present on disc florets only. Quantity per floret: Five per disc floret. Filament length: About 7 mm. Filament color: Close to 145C to 145D. Anther shape: Roughly oblong. Anther length: Less than 1 mm. Anther color: Close to 10A. Pollen amount: None observed. Gynoecium: Present on ray and disc florets. Quantity per floret: One. Pistil length: About 5 mm. Stigma diameter: Less than 1 mm. Stigma shape: Bi-parted. Stigma color: Close to 12A to 12B. Style length: About 4 mm. Style color: Close to 154D. Ovary color: Close to 145C. Seeds and fruits.—To date, seed and fruit development have not been observed on plants of the new Leucanthemum. Pathogen & pest resistance: To date, plants of the new Leucanthemum have not been observed to be resistant to pathogens and pests common to Leucanthemum plants. Garden performance: Plants of the new Leucanthemum have been observed to have good garden performance, no requirement for vernalization and to tolerate wind and rain, to suitable for USDA Hardiness Zones 5 to 11.