x<i>Semponium </i>plant named ‘Sienna’

Abstract

A new cultivar of x Semponium plant named ‘Sienna’ that is characterized by its compact, dense growth habit with short stems, its uniformly neat, conical growth habit, its tightly compact rings of adjacent foliage rosettes in tiers from the main stem, its production of multiple offsets; 1 head produces an average of 12 offsets, and its unique foliage coloration: in winter to early spring; green with dark purple-brown margins and light green centers, in mid spring; purple-brown, in late spring to autumn; bright orange with light green centers.

Claims

1. A new and distinct variety of x Semponium plant named ‘Sienna’ as described and illustrated herein.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The accompanying color photographs illustrate the overall appearance and distinct characteristics of 3-year-old plants of ‘Sienna’ as grown outdoors in a 5-liter container in Penzance, Cornwall, United Kingdom.

(2) The photograph in FIG. 1 provides a side view of a plant of ‘Sienna’ in summer.

(3) The photograph in FIG. 2 provides a close-up view of a rosette of ‘Sienna’ in winter to early spring.

(4) The 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 x Semponium.

DETAILED BOTANICAL DESCRIPTION

(5) The following is a detailed description of the new cultivar as observed on 3-year-old plants of ‘Sierra’ as grown outdoors (April to October) and in an unheated polytunnel (November to March) in 5-liter containers in Penzance, Cornwall, United Kingdom. The phenotype of the new cultivar may vary with variations in environmental, climatic, and cultural conditions, as it has not been tested under all possible environmental conditions. The color determination is in accordance with The 2015 Colour Chart of The Royal Horticultural Society, London, England, except where general color terms of ordinary dictionary significance are used. General description: Plant type.—Evergreen succulent perennial. Plant shape.—Conical. Plant habit.—Compact, dense basal rosette with offsets clustered around main rosette. Height and spread.—Reaches up to 40 cm in height and width. Hardiness.—At least hardy to −5° C., has not been tested in colder climates. Diseases and pests.—No susceptibility or resistance to diseases or pests has been observed. Root description.—Fibrous. Propagation.—Stem cuttings. Root development.—Roots initiate in an average of 6 weeks and fully root as a young plant in a P7 container in about 2 months. Growth rate.—Moderate. Stem description: Stem shape.—Cylindrical. Stem size.—1 to 3 cm in width and up to 32 cm in length. Stem surface.—Smooth with leaf scars at the base. Stem arrangement.—Verticillate, whorled in concentric rings of lateral branches. Stem aspect.—Horizontal to vertical. Internode length.—Up to 6 cm. Stem color.—198B. Foliage description: Leaf shape.—Narrowly spathulate. Leaf division.—Simple. Leaf arrangement.—Rosette. Leaf quantity.—Average of 80 to 100 per rosette. Leaf base.—Narrowly cuneate. Leaf apex.—Blunt round, mucronate. Leaf venation.—No veins visible. Leaf margins.—Ciliate. Leaf attachment.—Sessile. Leaf orientation.—Flat to slightly concave. Leaf substance.—Succulent. Leaf thickness.—1.5 to 2 mm. Leaf surface.—Upper and lower surface smooth and waxy with ciliate margins. Leaf color (upper and lower surface).—In winter to early spring; 145B to 145C with margins 183B and maturing leaves suffused with N77A, in mid spring; mature spring and to early autumn; 183A with centers 137B, in late spring to autumn; a blend of 170A and 171A with centers 137B. Leaf size.—Average of 7.5 cm in length and 2 cm in width. Rosette size.—Apical; 26 cm in width with 80 to 100 leaves, lateral; 17 cm in width with 60 to 80 leaves. Flower description: No flowers have been observed to date.