Coreopsis plant named ‘JETHRO TULL’
A new and distinct cultivar of Coreopsis plant named ‘Jethro Tull’, characterized by its compact, upright, outwardly spreading and mounded plant habit; vigorous growth habit; freely basal branching habit; freely flowering habit; rotate inflorescences with tubular golden yellow-colored ray florets; and strong peduncles that hold the inflorescences above the foliar plane.
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Botanical designation: Coreopsis auriculata×Coreopsis lanceolata.
Cultivar denomination: ‘Jethro Tull’.BACKGROUND OF THE INVENTION
The present invention relates to a new and distinct cultivar of Coreopsis plant, botanically known as Coreopsis auriculata×Coreopsis lanceolata, and hereinafter referred to by the name ‘Jethro Tull’.
The new Coreopsis originated from a cross-pollination made by the Inventor in Atlanta, Ga. in May, 2002, of the Coreopsis auriculata cultivar Zamfir, not patented, as the female, or seed, parent with the Coreopsis lanceolata cultivar Early Sunrise, not patented, as the male, or pollen, parent. The new Coreopsis was discovered and selected by the Inventor as a single flowering plant from the within the progeny of the stated cross-pollination grown in a controlled environment in Atlanta, Ga. in May, 2003.
Asexual reproduction of the new Coreopsis by vegetative cuttings in a controlled environment in Alpharetta, Ga. since July, 2003, has shown that the unique features of this new Coreopsis are stable and reproduced true to type in successive generations.SUMMARY OF THE INVENTION
The cultivar Jethro Tull has not been observed under all possible environmental conditions. The phenotype may vary somewhat with variations in environment 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 ‘Jethro Tull’. These characteristics in combination distinguish ‘Jethro Tull’ as a new and distinct cultivar of Coreopsis:
- 1. Compact, upright, outwardly spreading and mounded plant habit.
- 2. Vigorous growth habit.
- 3. Freely basal branching habit.
- 4. Freely flowering habit.
- 5. Rotate inflorescences with tubular golden yellow-colored ray florets.
- 6. Strong peduncles that hold the inflorescences above the foliar plane.
Plants of the new Coreopsis differ from plants of the female parent, the cultivar Zamfir, in the following characteristics:
- 1. Plants of the new Coreopsis are taller than plants of the cultivar Zamfir.
- 2. Plants of the new Coreopsis and the cultivar Zamfir differ in leaf shape.
- 3. Plants of the new Coreopsis have smaller inflorescences than plants of the cultivar Zamfir.
- 4. Inflorescences of plants of the new Coreopsis have more ray florets than inflorescences of plants of the cultivar Zamfir.
- 5. Plants of the new Coreopsis have longer ray florets than plants of the cultivar Zamfir.
Plants of the new Coreopsis differ from plants of the male parent, the cultivar Early Sunrise, in the following characteristics:
- 1. Plants of the new Coreopsis are more compact than plants of the cultivar Early Sunrise.
- 2. Inflorescences of plants of the new Coreopsis have fewer ray florets than inflorescences of plants of the cultivar Early Sunrise.
- 3. Ray florets of plants of the new Coreopsis are tubular in shape whereas ray florets of plants of the cultivar Early Sunrise are flat and not tubular in shape.
Plants of the new Coreopsis can be compared to plants of the Coreopsis cultivar Creme Brulee, disclosed in U.S. Plant Pat. No. 16,096. In side-by-side comparisons conducted in Tolar, Tex. plants of the new Coreopsis differed from plants of the cultivar Creme Brulee in the following characteristics:
- 1. Inflorescences of plants of the new Coreopsis had fewer ray florets than inflorescences of plants of the cultivar Creme Brulee.
- 2. Ray florets of plants of the new Coreopsis were tubular in shape whereas ray florets of plants of the cultivar Creme Brulee were flat and not tubular in shape.
- 3. Ray florets of plants of the new Coreopsis were darker yellow in color than ray florets of plants of the cultivar Creme Brulee.
The accompanying photographs illustrate the overall appearance of the new Coreopsis. The photographs show 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 Coreopsis.
The photograph on the first sheet comprises a side perspective view of a typical flowering plant of ‘Jethro Tull’ grown in an outdoor nursery.
The photograph on second sheet is a close-up view of typical inflorescences and leaves of ‘Jethro Tull’.
In the following description, color references are made to The Royal Horticultural Society Colour Chart, 1995 Edition, except where general terms of ordinary dictionary significance are used. The aforementioned photographs and following observations and measurements describe plants grown in Atlanta, Ga. during the spring and summer in an outdoor nursery and under conditions and practices which approximate those generally used in commercial Coreopsis production. During the production of the plants, day temperatures ranged from about 24° C. to 27° C. and night temperatures ranged from about 16° C. to 21° C. Measurements and numerical values represent averages for typical flowering plants. Plants were about eight months old when the photographs and description were taken.
- Botanical classification: Coreopsis auriculata×Coreopsis lanceolata cultivar Jethro Tull.
- Female parent.—Coreopsis auriculata cultivar Zamfir, not patented.
- Male parent.—Coreopsis lanceolata cultivar Early Sunrise, not patented.
- Type.—By vegetative cuttings.
- Time to initiate roots, summer.—About five days at 26° C.
- Time to initiate roots, winter.—About seven days at 18° C.
- Time to produce a rooted young plant, summer.—About three weeks at 26° C.
- Time to produce a rooted young plant, winter.—About five weeks at 18° C.
- Root description.—Thick, fibrous; white in color.
- Rooting habit.—Freely branching.
- Plant description:
- Plant form/growth habit.—Compact, upright, outwardly spreading and mounding plant habit; inverted triangle; freely basal branching with dense foliage and inflorescences held above the foliage on moderately strong peduncles. Vigorous growth habit.
- Plant height.—About 35 cm.
- Plant diameter or spread.—About 46 cm.
- Lateral branches.—Length: About 3 cm. Diameter: About 2 mm. Internode length: About 7 mm. Aspect: Mostly upright to slightly outwardly spreading. Strength: Strong. Texture: Smooth, glabrous. Color: Close to 144A.
- Foliage description:
- Arrangement.—Alternate, simple.
- Length.—About 7.5 cm.
- Width.—About 2.5 cm.
- Base.—Attenuate, tapering.
- Texture, upper surface.—Pubescent; rough.
- Texture, lower surface.—Smooth, glabrous.
- Venation pattern.—Pinnate.
- Color.—Developing and fully expanded foliage, upper surface: More green than 147A; venation, similar to lamina. Developing and fully expanded foliage, lower surface: Close to 146A; venation, similar to lamina.
- Petiole length.—About 3 cm.
- Petiole diameter.—About 2 mm.
- Petiole texture, upper and lower surfaces.—Smooth, glabrous.
- Petiole color, upper surface.—Close to 146A.
- Petiole color, lower surface.—Close to 146B.
- Inflorescence description:
- Appearance.—Rotate single inflorescence form with ray and disc florets. Inflorescences positioned above the foliage on moderately strong peduncles. Inflorescences face mostly upright. Freely flowering habit; about four to six inflorescences developing per lateral branch. Inflorescences persistent.
- Fragrance.—Slightly fragrant.
- Time to flower.—Under natural season conditions, plants flower from spring through the summer in Georgia.
- Post-production longevity.—Inflorescences maintain good substance for about one weeks on the plant.
- Inflorescence bud.—Height: About 7 mm. Diameter: About 7 mm. Shape: Globular. Color: Close to 144A.
- Inflorescence size.—Diameter: About 5 cm. Depth (height): About 1.8 cm. Disc diameter: About 1.4 cm. Receptacle diameter: About 9 mm. Receptacle height: About 7 mm.
- Ray florets.—Shape: Tubular, fluted towards the apex. Length: About 2.2 cm. Width, at apex: About 1 cm. Apex: Dentate. Base: Fused. Texture, upper and lower surfaces: Smooth, glabrous; satiny. Number of ray florets per inflorescence: About 18 arranged in a single whorl. Color: When opening and fully opened, outer surface: Close to 12A. When opening and fully opened, inner surface: Close to 12A to 12B.
- Disc florets.—Shape: Tubular; apex dentate. Length: About 1 cm. Diameter, apex: About 2.5 mm. Diameter, base: About 1 mm. Number of disc florets per inflorescence: About 60. Color: Apex: Close to 17A. Mid-section: Close to 19A. Base: Close to 19C to 19D.
- Phyllaries.—Quantity per inflorescence: About eight in a single whorl. Length: About 7 mm. Width: About 2.5 mm. Shape: Linear. Apex: Acute. Base: Fused. Margin: Entire. Texture, upper and lower surfaces: Smooth, glabrous. Color, upper surface: Close to 143A. Color, lower surface: Close to 144A.
- Peduncles.—Length: About 9 cm. Diameter: About 2 mm. Strength: Moderately strong. Aspect: Mostly upright to about 20° from vertical. Texture: Smooth, glabrous. Color: Close to 143A.
- Reproductive organs.—Androecium: Quantity per disc floret: One. Anther shape: Linear. Anther length: About 2 mm. Anther color: Close to 165B. Filament color: Close to 145D. Pollen amount: Scarce. Pollen color: Close to 14A. Gynoecium: Pistil length: About 8 mm. Stigma shape: Cleft. Stigma color: Close to 21A. Style length: About 6 mm. Style color: Close to 1C. Ovary color: Close to 145C to 145D.
- Seed/fruit.—Seed and fruit production has not been observed.
- Disease/pest resistance: Plants of the new Coreopsis have not been shown to be resistant to pathogens and pests common to Coreopsis.
- Garden performance: Plants of the new Clematis have exhibited good tolerance to rain and wind and have been observed to tolerate temperatures from about −10° C. to about 35° C.
1. A new and distinct Coreopsis plant named ‘Jethro Tull’ as illustrated and described.
International Classification: A01H 5/00 (20060101);