Euphorbia interspecific hybrid plant named ‘Eckcory’

Abstract

The variety “Eckcory” is a new and distinct interspecific hybrid plant. The plant is characterized by clean and dark green foliage, eliptical leaves that have acute bases and acuminate tips, brightly colored pink and white brachts and strong lateral branching.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of U.S. patent application Ser. No. 09/690,370, filed Oct. 16, 2000.

Botanical classification: Euphorbia pulcherrima×Euphorbia cornastra insterspecific hybrid.

BACKGROUND OF THE INVENTION

The invention relates generally to the new and distinct variety of interspecific plant termed “Eckcory.” The new plant was created in my greenhouse and laboratory in Encinitas, Calif. The plant was prepared by crossing the Euphorbia pulcherrima variety “M-6,” a Paul Ecke Ranch proprietary variety, with a seedling of the uncultivated species Euphorbia cornastra. The variety was selected by excision of a newly formed embryo from a seedpod followed by growth into a plantlet on nutrient agar medium. The cultured plantlet was transplanted to a greenhouse growing-medium, where it developed into the mature plant of the invention. As the plant matured, it exhibited strong terminal dominance with little lateral branch development. To induce lateral branching, the new plant was grafted onto a “selfbranching” rootstock by application of the procedures set forth in U.S. Pat. No. 4,724,276.

The plant of the invention is distinct from the parent plants from which it was derived. For example, Euphorbia pulcherrima is a “short day” plant with respect to flower initiation, while Euphorbia cornastra is a “long day” plant. However, the interspecific hybrid flowered in response to short days and the time to full flower development was found to be a relatively short six weeks, compared to the E. pulcherrima parent that took nine weeks for flower development under the same growing environment.

The first vegetative propagation of the plant in vitro occurred in October, 1998 in Encinitas Calif. The plant was first propagated ex vitro by grafting in August, 1999 in Encinitas, Calif. The distinctive characteristics of the plant remained consistent following propagation.

BRIEF DESCRIPTION OF THE DRAWING

The plant of the invention is illustrated in the accompanying color photographs.

DETAILED DESCRIPTION OF THE VARIETY

The following is a detailed description of the new plant as observed in Encinitas, Calif., USA during May 2000. Observations were recorded from flowering plants, grown as one branched plant per pot. Plants were about 14 weeks from unrooted cuttings when photographs were taken. The pot was 17 cm in diameter and 13 cm in height. Color designations are compared to the 1986 edition of R.H.S. Colour Chart, first published in 1966 by The Royal Horticultural Society, London, England.

Origin:         An interspecific hybrid created by cross-pollinating a
                cultivated Euphorbia pulcherrima plant with an
                uncultivated Euphorbia cornastra plant.
Classification: Botanical - Euphorbia X hybrid
Form:           Shrub
Height:         Short-medium
Growth          Flowering was observed, branched plant in a pot with an
Habit:          overall height of 42 cm, including the pot and an overall
                width of 42 cm. The plant grew upright but was
                somewhat spreading. The average diameter of the
                inflorescences, which were primarily composed of
                colored bracts, was 20 cm.
Branching:      Lateral branches develop and terminate in a flower
                without pinching. However, when pinched before flower
                induction to remove terminal dominance, all lateral
                branches develop uniformly and at a faster rate. The
                plant of description was pinched leaving 12 nodes on the
                stem. Strong lateral branches of nearly equal length and
                vigor arose, one from each stem node, resulting in a plant
                with 12 lateral branches. The lowermost lateral had 14
                nodes and the uppermost, 9 nodes subtending the flower.
Average branch  The average branch diameter was approximately 3 mm,
diameter and    and color was 146C.
color:
Growth Rate:    Rooting of stem cutting occurs in 18-21 days under
                intermittent mist. The plant will flower in about 6 weeks
                under continuous long night conditions and night
                temperatures of about 16-18 degrees C.
Foliage:        The foliage is clean and dark green from bottom to top of
                the plant. The leaves are of medium size, leaf blades
                typically 10 cm long and 5 cm wide for the larger lower
                leaves and 6 cm long and 2.5 cm wide for the smaller
                upper leaves. Leaf petioles are green and 6 cm long on
                the larger leaves to 3 cm on the smaller leaves. The
                upper leaf surface is glabrous, but slightly rugose and the
                under surface is finely pubescent.
Leaf shape:     Leaves are elliptic with acute bases and acuminate tips.
                Leaf margins are entire.
Leaf            Leaf arrangement alternate, single. Petiole length about 4
arrangement:    cm, diameter about 2 mm, color 178B (mature leaf
                petiole), 146C(immature leaf petiole).
Number of       Typical number of leaves per lateral branch about 12,
Leaves          observed 9 to 14 leaves per lateral branch.
Color:          Upper side - Dark green, darker than RHS 139A
                Under side - Green, near RHS 147B
Bracts:         There were 2-4 pink transitional bracts at the upper
                stem nodes just below the inflorescence. These were 7-8
                cm long and 3 cm wide. Eight to 10 bracts subtending
                the cyathia varied in size from 5 cm long and 2 cm wide
                to 1.5 cm long and 1 cm wide.
Shape:          Bracts are elliptic with acute bases and acuminate tips.
                Bract margins are entire.
Color:          Upper side - Pink, near RHS 57D
                Under side - Grayish-White, near RHS 156D
Flowers:        Generally, 8-10 rudimentary and sterile cyathia
                (flowers) were present at maturity. Each cyathium was
                about 5 mm long and 3 mm wide and green in color.
Pathogen        Resistance to pathogens and pests common to E.
resistance:     pulcherrima or E. cornastra has not been observed on
                plants grown under commercial conditions.

Claims

1. A new and distinct Euphorbia interspecific hybrid plant variety named “Eckcory” as illustrated and described herein.