<i>Euphorbia </i>plant named ‘BONPR 1639’

Abstract

A new and distinct cultivar of Euphorbia plant named ‘Bonpr 1639’, characterized by its relatively compact, upright and mounded plant habit; vigorous growth habit; freely branching habit; inflorescences with purplish red-colored flower bracts with random light purplish pink-colored spots, flecks and sectors; relatively small cyathia; and good post-production longevity.

Claims

1. A new and distinct Euphorbia plant named ‘Bonpr 1639’ 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 on the first sheet (FIG. 1) is a side perspective view of a typical flowering plant of ‘Bonpr 1639’ grown in a container.

(3) The photograph on the second sheet (FIG. 2) is a close-up view of a typical flowering plant of ‘Bonpr 1639’.

DETAILED BOTANICAL DESCRIPTION

(4) Plants used in the aforementioned photographs and described herewith in detail were grown during the autumn and early 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 six 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, 2015 Edition, except where general terms of ordinary dictionary significance are used. Botanical classification: Euphorbia pulcherrima Willd. ex Klotzsch X Euphorbia cornastra ‘Bonpr 1639’. Parentage: Naturally-occurring whole plant mutation of a proprietary selection of Euphorbia pulcherrima Willd. ex Klotzsch X Euphorbia cornastra identified as code number 15-38, not patented. Propagation: Type.—Terminal vegetative cuttings. Time to initiate roots, summer.—About ten days at temperatures about 20° C. to 21° C. Time to initiate roots, winter.—About twelve days at temperatures about 20° C. to 21° C. Time to produce a rooted young plant, summer.—About 24 days at temperatures about 20° C. to 21° C. Time to produce a rooted young plant, winter.—About four weeks at temperatures about 20° C. to 21° C. Root description.—Fibrous; typically white in color, actual color of the roots is dependent on substrate composition, water quality, fertilizers, substrate temperature and physiological age of roots. Rooting habit.—Freely branching; medium density. Plant description: Plant habit and form.—Relatively compact, upright and mounded plant habit; inverted triangle; inflorescences positioned above the foliar plane; vigorous growth habit. Plant height.—About 17 cm. Plant diameter or spread.—About 25 cm. Lateral branch description.—Branching habit: Freely branching habit, about four lateral branches develop per plant. Length: About 10.1 cm. Diameter: About 3.9 mm. Internode length: About 1.6 cm. Aspect: Mostly upright to somewhat outward. Strength: Strong. Texture: Smooth, glabrous. Color: Close to NN137B. Leaf description.—Arrangement: Alternate, simple. Length: About 7 cm. Width: About 4.7 cm. Shape: Lanceolate. Apex: Acute. Base: Rounded. Margin: Serrate, occasionally with few shallow lobes; slightly undulate. Venation pattern: Pinnate, reticulate. Texture and luster, upper surface: Rugose, glabrous; matte. Texture and luster, lower surface: Rough, sparsely pubescent; matte. Color: Developing leaves, upper surface: Close to 137B. Developing leaves, lower surface: Close to 138A. Fully developed leaves, upper surface: Darker than 139A; venation, close to 138B. Fully developed leaves, lower surface: Close to 137B; venation, close to 143A. Petioles: Length: About 1.8 cm. Diameter: About 2.1 mm. Texture, upper and lower surfaces: Sparsely pubescent. Color, upper surface: Close to 138A, variably tinged with close to 59B. Color, lower surface: Close to 138A. 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.—One per lateral branch, about four inflorescences develop per plant. Inflorescence diameter.—About 16.3 cm. Inflorescence height.—About 3.8 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 response, plants flower about 50 days under natural season or photoinductive conditions in Japan. Post-production longevity.—Good post-production longevity; plants of the new Euphorbia maintain good substance and bract color for about eight weeks. Flower bracts.—Quantity per inflorescence: About 15. Length: About 6.1 cm. Width: About 3.6 cm. Shape: Elliptic. Apex: Acute. Base: Obtuse. Margin: Entire with occasional irregular serrations; slightly undulate. Texture, upper and lower surfaces: Smooth, glabrous. Aspect: Mostly horizontal. Venation pattern: Pinnate, reticulate. Color: Transitional bracts, upper surface: Random sectors and areas, close to N57B and 69C; towards the margins, close to 143A. Transitional bracts, lower surface: Random sectors and areas, close to N57D and 69C; towards the apex, close to 143A. Developing bracts, upper surface: Close to N57A and 62B. Developing bracts, lower surface: Close to 63A and 62C. Fully expanded bracts, upper surface: Close to N57B; random spots, flecks and sectors, close to 68D; venation, close to N57B. Fully expanded bracts, lower surface: Close to 58D; random spots, flecks and sectors, close to NN155B; venation, close to 143D. Flower bract petioles: Length: About 1.2 cm. Diameter: About 1.4 mm. Texture, upper and lower surfaces: Sparsely pubescent. Color, upper and lower surfaces: Close to N57B and 144D. Cyathia.—Quantity per corymb: About 19. Diameter of cyathia cluster: About 2.7 cm. Height, individual cyathium: About 4 mm. Diameter, individual cyathium: About 5.7 mm. Shape, individual cyathium: Globose. Color: Distally, close to 67A and proximally, close to 143A. Nectaries: Quantity per cyathium: One. Size: About 2.2 mm by 3.4 mm. Texture: Smooth, glabrous. Color: Close to 3C. Peduncles.—Length: About 2.1 mm. Diameter: About 1.8 mm. Texture, upper and lower surfaces: Smooth, glabrous. Aspect: Mostly upright. Color, upper and lower surfaces: Close to 144C. Reproductive organs.—Stamens: Quantity per cyathia: Two. Filament length: About 1.9 mm. Filament color: Close to 67B. Anther size: About 0.9 mm by 1.1 mm. Anther shape: Oblong. Anther color: Close to 160B and 64A. Pollen amount: Sparse. Pollen color: Close to 3A. Pistils: To date, pistil development has not been observed on plants of the new Euphorbia. Seeds and fruits.—To date, seed and fruit production has not been observed on plants of the new Euphorbia. Pathogen & 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.