<i>Rhamnus </i>tree named ‘SMNRFBT’

Abstract

A new and distinct Rhamnus cultivar named SMNRFBT is disclosed, characterized by narrow leaves, good branching and dense foliage. The new variety is a Rhamnus, normally used for outdoor ornamental purposes.

Claims

1. A new and distinct cultivar of Rhamnus plant named SMNRFBT as herein illustrated and described.

Description

BRIEF DESCRIPTION OF THE PHOTOGRAPH

(1) The accompanying photograph illustrates in full color a typical plant of SMNRFBT in a 2 gallon pot. Age of the plant photographed is approximately 2-3 years old from a rooted cutting. The photograph was taken using conventional techniques and although colors may appear different from actual colors due to light reflectance it is as accurate as possible by conventional photographic techniques.

DETAILED BOTANICAL DESCRIPTION

(2) In the following description, color references are made to The Royal Horticultural Society Colour Chart 2015 except where general terms of ordinary dictionary significance are used. The following observations and measurements describe SMNRFBT plants grown in a poly greenhouse during July 2017, in Grand Haven, Mich. The growing temperature ranged from approximately 18 C. to 27 C. during the day and from approximately 5 C. to 10 C. during the night. General light conditions are normal sunlight and numerical values represent averages of typical plant types. Botanical classification: Rhamnus frangula SMNRFBT.

PROPAGATION

(3) Type of propagation typically used: Softwood cuttings. Time to initiate roots: 12 days in Summer. Time to produce a rooted cutting: 3 months in Summer. Root description: Thin to thick, fibrous, moderately dense, freely branching. Tan to brown in color, not accurately measured with R.H.S. Chart.

PLANT

(4) Plant type: Perennial deciduous shrub. Age of plant described: 2-3 years old from a rooted cutting. Container size: 3 gallon container. Overall plant shape: Very upright, columnar. Growth habit: Upright. Plant spread: 70 cm. Plant height: 144 cm. Plant vigor: Good. Branching habit: Freely branching from the bottom. Length of primary lateral branches: 80 cm. Diameter of lateral branches: 7 mm. Quantity of lateral branches: Over 50. Stem: Color.RHS Grey 201A. Shape.Round. Appearance.Glabrous, smooth. Strength.Strong. Aspect angle.65-75. Pubescence.No. Internode length: 0.5-2.5 cm.

FOLIAGE

(5) Leaf: Arrangement.Alternate, single. Average length.14.5 cm. Average width.16 mm. Shape of blade.Linear. Apex.Acute. Base.Cuneate. Margin.Irregular, undulate. Texture of top surface.Glabrous, smooth. Texture of bottom surface.Glabrous, smooth. Color.Young foliage in Spring upper side: RHS Green 137A. Young foliage in Spring under side: RHS Green 137C. Mature foliage upper side: RHS Green 137A. Mature foliage under side: RHS Green 137C. Fall foliage upper side: Near RHS Yellow 7B. Fall foliage under side: Near RHS Yellow 7C. Venation.Type: Pinnate. Venation color upper side: RHS Yellow-Green 153D. Venation color under side: RHS Yellow-Green 144D. Petiole.Length: 1.25 cm. Diameter: 1.5 mm. Texture, upper side: Smooth, some pubescence. Texture, under side: Smooth, some pubescence. Color, upper side: RHS Yellow-Green 152B. Color, under side: RHS Yellow-Green 144D.

FLOWER

(6) Arrangement: Small, single rotate flowers arranged in axillary clusters, not persistent, inconspicuous. Flowering habit: Small, inconspicuous clusters. Natural flowering season: June to July. Flowers per inflorescence: 3-6 per cluster. Flowers and buds per plant: 20. Individual flowers: Type.Rotate. Quantity.0-3 per lateral stem. Diameter.4 mm. Length.4 mm. Aspect.Upward, outward. Persistence.Self-cleaning. Fragrance.None. Petals: Arrangement.Rotate. Number.5. Shape.Narrowly deltoid. Margin.Entire. Tip shape.Acute. Base shape.Truncate. Length.1.5 mm. Width.1.5 mm. Texture.Upper: Smooth. Lower: Smooth. Color.When opening: Upper surface: RHS Green-White 157A. Under surface: RHS Greyed-Orange 177A. Fully opened: Upper surface: RHS Green-White 157A. Under surface: RHS Green-White 157A. Bud: Quantity.0-3 per lateral stem. Shape.Globose. Length.3 mm. Diameter.3 mm. Color.RHS Green 139D. Petaloids: Not observed. Sepals: Not observed. Peduncle: Length.5 mm. Diameter.<1 mm. Texture.Smooth. Angle.15. Color.RHS Green 139D. Strength.Weak. Pedicel: None.

REPRODUCTIVE ORGANS

(7) Stamens: Number.5. Filament length.1 mm. Filament color.RHS Green 139D. Anthers.Shape: Oblong. Length: 1 mm. Color: Brownish, too small to measure with R.H.S. chart. Pollen.Scant. Pistil: Number.1. Length.1 mm. Style.Length: 1 mm. Color: RHS Green 139D. Stigma: Shape.Spherical. Color.RHS Green 139D. Ovary color.RHS Green 139D.

OTHER CHARACTERISTICS

(8) Fruits and seeds: Not observed to date. Disease/pest resistance: Neither resistance nor susceptibility to normal diseases and pests of Rhamnus observed. Temperature range: Observed to tolerate a temperature range from 28 C. to 35 C. Root hardy to 28 C, top of the plant does die back to the ground.