Euphorbia plant named ‘Bonpri 9172’

Abstract

A new and distinct cultivar of Euphorbia plant named Bonpri 9172, characterized by its upright and mounded plant habit; moderately vigorous growth habit; freely branching habit; dark green-colored leaves; inflorescences with red-colored flower bracts; and good post-production longevity.

Claims

1. A new and distinct Euphorbia plant named Bonpri 9172 as illustrated and described.

Description

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

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

(2) The photograph at the top of the sheet comprises a side perspective view of a typical flowering plant of Bonpri 9172 grown in a container.

(3) The photograph at the bottom of the sheet is a close-up view of a typical inflorescence of Bonpri 9172.

DETAILED BOTANICAL DESCRIPTION

(4) Plants used in the aforementioned photographs and herewith described in detail were grown during the autumn and winter in 12-cm containers in an outdoor nursery in Higashiomi, Shiga, Japan and under cultural practices typical of commercial Euphorbia production. During the production of the plants, day temperatures averaged 23 C. and night temperatures averaged 13 C. Plants were four months old when the photographs and the description were taken. In the following description, color references are made to The Royal Horticultural Society Colour Chart, Fourth Edition, 2007, except where general terms of ordinary dictionary significance are used. Botanical classification: Euphorbia pulcherrima Willd. ex Klotzsch Euphorbia cornastra Bonpri 9172. Parentage: Naturally-occurring whole plant mutation of a proprietary selection of Euphorbia pulcherrima Willd. ex KlotzschEuphorbia cornastra identified as code number 574, not patented. Propagation: Type.Terminal vegetative cuttings. Time to initiate roots, summer.About ten days at 18 C. to 25 C. Time to initiate roots, winter.About twelve days at 16 C. to 20 C. Time to produce a rooted young plant, summer.About three weeks at 18 C. to 25 C. Time to produce a rooted young plant, winter.About four weeks at 16 C. to 20 C. Root description.Fibrous. Rooting habit.Freely branching; medium density. Plant description: Plant habit and form.Upright and mounded plant habit; inverted triangle; inflorescences positioned above the foliar plane; moderately vigorous growth habit. Plant height.About 22.5 cm. Plant diameter or spread.About 32 cm. Lateral branch description.Branching habit: Freely branching habit, about six lateral branches develop per plant. Length: About 15.5 cm. Diameter: About 3.3 mm. Internode length: About 1.6 cm. Aspect: Mostly upright to outwardly spreading. Strength: Strong. Texture: Sparsely pubescent. Color: Close to 137D. Leaf description.Arrangement: Alternate, simple. Length: About 5.8 cm. Width: About 3.8 cm. Shape: Ovate. Apex: Acute. Base: Rounded. Margin: Entire; slightly undulate. Venation pattern: Pinnate, reticulate. Texture, upper and lower surfaces: Sparsely pubescent. Color: Developing leaves, upper surface: Darker than N137A. Developing leaves, lower surface: Close to 137C. Fully developed leaves, upper surface: Close to N137A; venation, close to 144C. Fully developed leaves, lower surface: Close to 138B; venation, close to 144D. Petioles: Length: About 1.6 cm. Diameter: About 1.7 mm. Texture, upper and lower surfaces: Pubescent. Color, upper and lower surfaces: Close to 144A; towards the base, slightly tinged with close to 59B. Inflorescence description: Inflorescence type and habit.Inflorescences are compound corymbs of cyathia with numerous flower bracts subtending the cyathia; inflorescences positioned above the foliar plane. Quantity of inflorescences.About eight inflorescences develop per plant. Inflorescence diameter.About 30 cm. Inflorescence height.About 1.6 cm. Fragrance.None detected. Natural flowering season.Plants typically flower during the autumn and winter in Japan; inflorescence initiation and development can also be induced under artificial long nyctoperiod and short photoperiod conditions; early flowering habit, plants flower about seven weeks under natural season conditions in Japan. Post-production longevity.Good post-production longevity; plants of the new Euphorbia maintain good substance and bract color for about six weeks. Flower bracts.Quantity per inflorescence: About 26. Length, largest bracts: About 6.8 cm. Width, largest bracts: About 3.9 cm. Shape: Elliptic. Apex: Acute. Base: Rounded. Margin: Entire. Texture, upper and lower surfaces: Smooth, glabrous. Aspect: Mostly horizontal. Venation pattern: Pinnate, reticulate. Color: Transitional bracts, upper surface: Close to 144A, N137A and 63A. Transitional bracts, lower surface: Close to 137C. Developing bracts, upper surface: Darker than N57A. Developing bracts, lower surface: Close to N57C. Fully expanded bracts, upper surface: Close to 45A; venation, close to 176B. Fully expanded bracts, lower surface: Close to 65A; towards the margins, close to 65D; venation, close to 144B. Flower bract petioles: Length: About 9.3 mm. Diameter: About 1.2 mm. Texture, upper and lower surfaces: Smooth, glabrous. Color, upper surface: Close to 144A tinged with close to N57B. Color, lower surface: Close to 144A. Cyathia.Quantity per corymb: About 13. Diameter of cyathia cluster: About 2.6 cm. Height, individual cyathium: About 7.2 mm. Diameter, individual cyathium: About 5.8 mm. Shape, individual cyathium: Globose; sessile. Color: Close to 144B. Nectaries: Quantity per cyathium: One. Size: About 1.7 mm by 3.2 mm. Color: Close to 150C. Peduncles.Length: About 2.3 mm. Diameter: About 1.9 mm. Strength: Strong. Aspect: Mostly upright to outward. Texture: Smooth, glabrous. Color: Close to 144B. Reproductive organs.Stamens: Quantity per cyathium: Numerous. Anther shape: Lanceolate or globose. Anther length: About 0.3 mm to 0.7 mm. Anther color: Close to N57B. Amount of pollen: None observed. Pistils: Plants of the new Euphorbia have not been observed to develop pistils. Seeds and fruits: Seed and fruit production has not been observed on plants of the new Euphorbia. Disease & pest resistance: Plants of the new Euphorbia have not been shown to be resistant to pathogens and pests common to Euphorbia plants. Temperature tolerance: Plants of the new Euphorbia have been observed to tolerate temperatures ranging from about 8 C. to about 40 C.