A new and distinct cultivar of Double Impatiens plant named `Coral Duet`, characterized by its consistently double flowers that are either coral or light coral pink in color with flowers of both colors on the same plant; upright and mounded plant habit; freely branching; and dark green leaves.

BACKGROUND OF THE INVENTION
 The present invention relates to a new and distinct cultivar of Double
 Impatiens plant, botanically known as Impatiens walleriana, and
 hereinafter referred to by the cultivar name Coral Duet.
 The new Double Impatiens is a naturally-occurring mutation of an
 unidentified selection of the seed-grown Impatiens walleriana Rosette Mix
 series (not patented). The new Double Impatiens was discovered and
 selected by the Inventor in October, 1987, as a flowering plant within a
 population of plants of the unidentified selection of the Rosette Mix
 series grown in a controlled environment in Carson City, Mich. The new
 Double Impatiens was selected on the basis of having both coral and
 lighter coral pink flowers on the same plant. In addition to the two
 flower colors on the same plant, plants of the new Double Impatiens are
 more dwarf and have larger and more numerous flowers than plants of the
 unidentified selection of the seed-produced Rosette Mix series.
 Asexual reproduction of the new cultivar by terminal cuttings taken at
 Carson City, Mich., has shown that the unique features of this new Double
 Impatiens are stable and reproduced true to type in successive generations
 of asexual reproduction.
 SUMMARY OF THE INVENTION
 The following traits have been repeatedly observed and are determined to be
 the unique characteristics of `Coral Duet`. These characteristics in
 combination distinguish `Coral Duet` as a new and distinct cultivar:
 1. Consistently double flowers that are either coral or light coral pink in
 color. Plants consistently produce both coral and light coral pink-colored
 flowers.
 2. Upright and mounded plant habit.
 3. Freely branching; plants do not require pinching.
 4. Dark green leaves.

DETAILED BOTANICAL DESCRIPTION
 The cultivar Coral Duet 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 observations, measurements and
 comparisons describe plants grown 10-cm pots in Carson City, Mich. and
 Keller, Tex., under conditions which closely approximate typical
 commercial practice for Double Impatiens. Plants used for the description
 were about 10 to 12 weeks old from rooted cuttings.
 In the following description, color references are made to The Royal
 Horticultural Society Colour Chart except where general terms of ordinary
 dictionary significance are used.
 Botanical classification: Impatiens walleriana cultivar Coral Duet.
 Parentage: Naturally-occurring mutation of unidentified selection of the
 seed-grown Impatiens walleriana Rosette Mix series (not patented).
 Propagation:
 Type cutting.--Terminal cuttings.
 Time to initiate roots.--About 10 to 14 days at 18.degree. C.
 Time to develop roots.--About 35 days to 18.degree. C.
 Root description.--Fibrous, fine, freely branching.
 Plant description:
 Plant form.--Upright and mounded.
 Growth and branching habit.--Basal branching with about five lateral
 branches at the base with secondary lateral shoots forming typically at
 most nodes; plants do not require pinching. Appropriate for 10-cm and
 larger containers.
 Plant height.--About 18 cm; larger plants may attain a height of about 30
 cm.
 Lateral branches.--Length: About 13 cm. Diameter: About 7.5 mm. Internode
 length: About 2.2 cm. Color: 146B to 146C with dark red purple, Close to
 59A, longitudinal streaks.
 Foliage description.--Leaves simple, symmetrical, abundant, alternate.
 Length: About 4.7 cm. Width: About 3.4 cm. Shape: Ovate. Apex: Sharply
 acuminate. Base: Obtuse. Margin: Crenate and ciliate. Texture: Smooth,
 glabrous. Color: Fully expanded foliage, upper surface: Greener than 147A.
 Fully expanded foliage, lower surface: close to 147B with dulled purple,
 fainter than 183B, spots. Petiole: Length: About 2.1 cm. Diameter: About 3
 mm. Color: Upper surface: Light green, close to 147C. Lower surface: Close
 to 147C.
 Flower description:
 Flower type and habit.--Consistently double flowers. Flowers can be either
 coral with faint light coral pink longitudinal streaks or light coral pink
 with coral longitudinal streaks. Both color types are found consistently
 on individual plants. Flower buds open similar to a rose in fullness.
 Freely and continuously flowering. Flowers arise from leaf axils. Usually
 about four flowers and flower buds per secondary lateral branch. Flowers
 positioned slightly above the foliage and typically face outward and
 upright. Flowers not persistent.
 Flowering season.--Year-round under greenhouse conditions. In the garden,
 flowering is continuous from spring until fall.
 Flower size.--Diameter: About 4.3 cm. Depth (height): About 2.1 cm.
 Flower buds.--Length: About 1.5 cm. Diameter: About 1 cm. Shape: Ovoid.
 Color: Close to 48C.
 Petals/petaloids.--Quantity: Numerous, about 25 to 60. Length: About 2.5
 cm. Width: About 2.1 cm. Shape: Rounded to slightly cordate. Apex: Rounded
 or ermarginate. Base: Attenuate. Margin: Entire. Texture: Smooth, satiny.
 Color: Flowers that are coral with faint light coral pink longitudinal
 streaks: When opening, upper surface: More intense than a combination of
 40A, 43B and 47B with faint light coral pink, close to 47D to 48C to 48D
 to 49D, longitudinal streaks; iridescent. When opening, lower surface; 48B
 to 48C with faint light coral pink, close to 48D to 49D, longitudinal
 streaks; somewhat iridescent. Fully opened, upper surface: More intense
 than a combination of 40A, 43B and 47B to 47C with faint light coral pink,
 close to 47D to 48C to 48D to 49D, longitudinal streaks; iridescent. Fully
 opened, lower surface: Close to 48B to 48D with faint light coral pink,
 close to 48D to 49D, longitudinal streaks; somewhat iridescent. Flowers
 that are light coral pink with coral longitudinal streaks: When opening,
 upper surface: 48C to 48D with coral, 47B to 47C, longitudinal streaks;
 iridescent. When opening, lower surface: 48D to 49A with coral, 47D to 48B
 to 48C, margins and longitudinal streaks; somewhat iridescent. Fully
 opened, upper surface: 49A to 49D with coral, 47B to 47C, longitudinal
 streaks; iridescent. Fully opened, lower surface: 49C to 49D with coral,
 48C to 48D, margins and longitudinal streaks; somewhat iridescent.
 Spurs.--Length: About 3.4 cm. Diameter: About 1 mm. Color: Initially green,
 close to 146C, with slight anthocyanin, close to 59A, becoming light pink,
 56A, with flower development.
 Peduncles.--Length: About 3.2 cm. Diameter: About 2 mm. Angle: Upright or
 outward. Strength: Moderately strong; flexible. Color: 146A to 146C.
 Reproductive organs.--None have been observed to date.
 Disease resistance: Under commercial conditions, resistance to pathogens
 has not been observed.
 Seed development: Seed production has not been observed to date.