Dahlia plant named ‘G15307’

Abstract

A new and distinct cultivar of Dahlia plant named G15307, characterized by its upright and mounding plant habit; vigorous growth habit; freely branching habit; dark green-colored leaves; early and freely flowering habit; and semi-double type inflorescences with yellow and greyed orange-colored ray florets.

Claims

1. A new and distinct Dahlia plant named G15307 as illustrated and described.

Description

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

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

(2) The photograph at the bottom of the sheet is a side perspective view of a typical flowering plant of G15307 grown in a container.

(3) The photograph at the top of the sheet is a close-up view of a typical flowering plant of G15307.

DETAILED BOTANICAL DESCRIPTION

(4) The aforementioned photographs and following observations and measurements describe plants grown during the spring in 11.5-cm containers in an acrylic-covered greenhouse in Carleton, Mich. and under cultural practices typical of commercial potted Dahlia production. During the production of the plants, day and night temperatures ranged from 18 C. to 27 C. Plants were eleven weeks old when the photographs and description were taken. In the following description, color references are made to The Royal Horticultural Society Colour Chart, 2007 Edition, except where general terms of ordinary dictionary significance are used. Botanical classification: Dahlia variabilis G15307. Parentage: Female, or seed, parent.Proprietary selection of Dahlia variabilis identified as code number 3165-1-2M-2M-1-2, not patented. Male, or pollen, parent.Unidentified proprietary selection of Dahlia variabilis, not patented. Propagation: Type.By vegetative terminal cuttings. Time to initiate roots, summer.About 7 to 10 days at ambient temperatures about 22 C. to 27 C. Time to initiate roots, winter.About 10 to 14 days at ambient temperatures about 18 C. to 23 C. Time to produce a rooted plant, summer.About three to four weeks at ambient temperatures about 22 C. to 27 C. Time to produce a rooted plant, winter.About four weeks at temperatures about 18 C. to 23 C. Root description.Medium in thickness, fleshy and fibrous; close to white to creamy white in color, actual color of the roots is dependent on substrate composition, water quality, fertilizers, substrate temperature and age of roots; tuber development has not been observed on plants of the new Dahlia to date. Rooting habit.Freely branching; medium density. Plant description: Plant and growth habit.Upright and mounded plant form; broad inverted triangle; freely branching habit with about eight primary lateral branches each with about four to five secondary lateral branches developing per plant; inflorescences held within, above and beyond the foliar plane on strong peduncles; vigorous growth habit and moderate growth rate. Plant height, soil level to top of foliar plane.About 35 cm. Plant height, soil level to top of floral plane.About 38 cm. Plant diameter or spread.About 40 cm. Lateral branches.Length: About 32 cm. Diameter: About 7 mm. Internode length: About 4.5 cm. Strength: Strong. Aspect: Primary laterals, mostly erect; secondary laterals, about 35 to 40 from vertical. Texture: Smooth, glabrous. Luster: Somewhat glossy. Color: Developing, close to 187A; color becoming closer to 200A with subsequent development. Leaf description: Arrangement.Opposite; simple. Length.About 12 cm. Width.About 12.8 cm. Shape.Pinnatifid; deeply incised with five to seven lobes with parallel sinuses. Lobe length.About 6.5 cm. Lobe width.About 3.2 cm. Apex.Acute. Base.Attenuate, equilateral. Margin.Crenate. Venation pattern.Pinnate. Texture, upper and lower surfaces.Smooth and mostly glabrous with minute hairs along veins. Luster, upper and lower surfaces.Matte. Color.Developing leaves, upper surface: Slightly darker than 147A. Developing leaves, lower surface: Close to 147A. Fully expanded leaves, upper surface: Darker than 139A; venation, close to 187A. Fully expanded leaves, lower surface: Close to N137C; venation, close to 200C. Petioles.Length: About 4.2 cm. Diameter: About 3.5 mm. Strength: Strong. Texture, upper and lower surfaces: Smooth, glabrous. Luster, upper and lower surfaces: Matte. Color, upper surface: Close to 200B. Color, lower surface: Close to N199A. Inflorescence description: Appearance and arrangement.Semi-double inflorescence form with ray florets forming acropetally on a receptacle; inflorescences positioned above the foliar plane on strong peduncles; inflorescences face mostly upright, outwardly to slightly nodding; freely flowering habit with about 48 inflorescences developing per plant. Fragrance.None detected. Time to flower.Early flowering habit, plants begin flowering about six weeks after planting; plants flower continuously from spring until frost in Michigan. Post-production longevity.Inflorescences maintain good substance for about five to six days on the plant; ray florets not persistent and disc florets persistent. Inflorescence buds.Height: About 1.8 cm. Diameter: About 1.8 cm. Shape: Flattened sphere. Texture and luster: Smooth, glabrous; somewhat glossy. Color: Close to 163A tinted with close to 152B to 152C. Inflorescence size.Diameter: About 6.2 cm. Depth (height): About 2.4 cm. Disc diameter: About 2 cm. Receptacles.Height: About 8 mm. Diameter: About 4.5 cm. Shape: Rounded, bowl-shape. Color: Close to 200C to 200D. Ray florets.Quantity per inflorescence: About 15 arranged in about 1.5 to 2 whorls. Length: About 3 cm. Width: About 1.7 cm. Shape: Obovate. Apex: Rounded, tri-dentate. Base: Attenuate, fused at base. Margin: Entire; undulate. Aspect: Initially upright to roughly perpendicular to the peduncle with apices slightly upright. Texture, upper and lower surfaces: Longitudinally ridged, glabrous. Luster, upper and lower surfaces: Matte. Color: When opening, upper surface: Close to 13A. When opening, lower surface: Close to 163A to 163B. Fully opened, upper surface: Close to 7A; towards the apex, tinged with close to N163B to N163C; venation, close to 13A; color towards the apex becoming closer to 13A with development. Fully opened, lower surface: Close to 7A; towards the apex, tinged with close to N163B; venation, close to 164A to 164B; color towards the apex becoming closer to 7A with development. Disc florets.Quantity per inflorescence: About 92 arranged in about nine to ten whorls. Length: About 1.5 cm. Diameter: About 2 mm. Shape: Tubular, elongated; apices acute. Texture: Smooth, glabrous. Luster: Moderately glossy. Color, when opening: Close to 166B and becoming closer to N167A with development. Color, fully opened: Close to N167A. Phyllaries.Quantity per inflorescence: One inner whorl with about eight phyllaries that are membraneous and closely appressed to the receptacle and one outer whorl with about six phyllaries that are bract-like and reflex downwardly. Inner whorls: Length: About 1.8 cm. Width: About 6 mm. Shape: Elliptical. Apex: Acute. Base: Truncate. Margin: Entire. Texture, upper and lower surfaces: Smooth, glabrous. Luster, upper and lower surfaces: Glossy. Color, upper and lower surfaces: Close to 199A. Outer whorls: Length: About 1.5 cm. Width: About 6 mm. Shape: Elliptical. Apex: Acute. Base: Truncate. Margin: Entire. Texture, upper and lower surfaces: Smooth, glabrous. Luster, upper and lower surfaces: Slightly glossy. Color, upper surface: Close to N137B. Color, lower surface: Close to N137A. Peduncles.Length, terminal peduncles: About 6.3 cm. Diameter, terminal peduncles: About 2 mm. Length, axillary peduncles: About 5.8 cm. Diameter, axillary peduncles: About 2 mm. Aspect, terminal peduncles: Mostly erect to bent with the weight of the inflorescences. Aspect, axillary peduncles: About 45 from lateral branch axis. Strength: Strong. Texture: Smooth, glabrous. Luster: Somewhat glossy. Color: Close to 200A. Reproductive organs.Present on disc florets only. Androecium: Quantity per floret: Five. Filament length: About 8 mm. Filament color: Close to 145D. Anther shape: Lanceolate. Anther size: About 5 mm by 1 mm. Anther color: Close to 17B. Pollen amount: Moderate. Pollen color: Close to 17C. Gynoecium, ray florets: Quantity per floret: One. Pistil length: About 7 mm. Style length: About 4 mm. Style color: Close to 2B. Stigma diameter: About 2 mm. Stigma shape: Bi-parted. Stigma color: Close to 14A. Ovary color: Close to 157A. Gynoecium, disc florets: Quantity per floret: One. Pistil length: About 1.6 cm. Style length: About 1 cm. Style color: Close to 2B. Stigma diameter: About 2 mm. Stigma shape: Bi-parted. Stigma color: Close to 14A. Ovary color: Close to 157A. Seeds and fruits: Seed and fruit development have not been observed on plants of the new Dahlia to date. Disease & pest resistance: Plants of the new Dahlia have not been observed to be resistant to pathogens and pests common to Dahlia plants to date. Temperature tolerance: Plants of the new Dahlia have been observed to tolerate low temperatures about 1.7 C. and to be suitable for USDA Hardiness Zones 8 to 11.