U.S. patent number PP18,883 [Application Number 11/351,912] was granted by the patent office on 2008-06-03 for dianella revoluta plant named `dtn03`.
This patent grant is currently assigned to VersaScapes L.L.C.. Invention is credited to Todd Anthony Layt.
United States Patent |
PP18,883 |
Layt |
June 3, 2008 |
Dianella revoluta plant named `DTN03`
Abstract
`DTN03` is a distinctive variety of Dianella revoluta, which is
characterized by its combination of bluish-green leaf color, strong
leaf glaucosity, very short height, erect growth habit, very dense
shoots with very short internodes, and narrow leaf blade. Pale blue
flowers on stems up to 50 cm high typically develop in spring and
early summer and are followed by green berries.
Inventors: |
Layt; Todd Anthony (New South
Wales, AU) |
Assignee: |
VersaScapes L.L.C. (Mt.
Pleasant, SC)
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Family
ID: |
36817182 |
Appl.
No.: |
11/351,912 |
Filed: |
February 10, 2006 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20060185048 P1 |
Aug 17, 2006 |
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Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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60652203 |
Feb 11, 2005 |
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Current U.S.
Class: |
PLT/424;
PLT/384 |
Current CPC
Class: |
A01H
5/02 (20130101) |
Current International
Class: |
A01H
5/00 (20060101) |
Field of
Search: |
;PLT/263,384 |
Other References
Layt; "Dianella revoluta flax lily `DTN03`," Plant Varieties
Journal 17 (1):27-28,133,145-6,585-87 (Apr. 28, 2004). cited by
examiner.
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Primary Examiner: Bell; Kent
Assistant Examiner: Krawczewicz Myers; Louanne
Attorney, Agent or Firm: Myers Bigel Sibley & Sajovec,
P.A.
Claims
That which is claimed is:
1. A new and distinct variety of Dianella revoluta plant named
`DTN03`, substantially as described and illustrated herein.
Description
Latin name of the genus and species: The Latin name of the novel
variety disclosed herein is Dianella revoluta `DTN03`.
Variety denomination: The inventive variety of Dianella revoluta
disclosed herein has been given the variety denomination
`DTN03`.
BACKGROUND OF THE INVENTION
The present invention relates to a new and distinct variety of
evergreen perennial Dianella revoluta, which has been named
`DTN03`. It is anticipated that the plant of this invention will be
marketed under the tradename Baby Bliss. Dianella are a genus of
ornamental grass-like plants in the Phormiaceae family. In general,
Dianella revoluta has flax-like leaves with curved edges. Pale blue
flowers on stems up to 50 cm high typically develop in spring and
early summer and are followed by green berries. Lineage: The
cultivar `DTN03` was discovered in 1996 in Clarendon, New South
Wales, Australia, during a seedling selection of cultivated
Dianella revoluta `DR4000` (unpatented). The parent `DR4000` is
characterized by a wide leaf with medium glaucosity, tall plant
height, and medium plant density. Selection criteria for `DTN03`
were bluish-green leaf color, strong leaf glaucosity, and short
plant height with a dense compact habit. Asexual reproduction: The
new variety `DTN03` was first asexually propagated by vegetative
division in the state of New South Wales, Australia in September
1998 and has been asexually propagated since that time by division
and micropropagation. The distinctive characteristics of `DTN03`
have remained stable and true to type through successive cycles of
asexual propagation.
SUMMARY OF THE INVENTION
`DTN03` is a distinctive variety of Dianella revoluta, which is
characterized by its combination of bluish-green leaf color, strong
leaf glaucosity, very short height, erect growth habit, very dense
shoots with very short internodes, and narrow leaf blade. Pale blue
flowers on stems up to 50 cm high typically develop in spring and
early summer and are followed by green berries.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an exemplary Dianella revoluta `DTN03` plant at
approximately 15 months of age. The plant was propagated in a
greenhouse and was transferred to the field at six months and grown
out in full sun for the final nine months.
FIG. 2 shows the typical flowers of a Dianella revoluta `DTN03`
plant.
DETAILED BOTANICAL DESCRIPTION OF THE VARIETY
The following is a detailed botanical description of a new and
distinct variety of Dianella revoluta known as `DTN03` based upon
observations of 15-month-old plants grown in 140 mm nursery pots in
full sun in open beds in Clarendon, New South Wales, Australia.
Color notations are based on The Royal Horticultural Society Colour
Chart, The Royal Horticultural Society, London, 1995 edition.
Those skilled in the art will appreciate that certain
characteristics will vary with older or, conversely, with younger
plants. `DTN03` has not been observed under all possible
environmental conditions. Where dimensions, sizes, colors and other
characteristics are given, it is to be understood that such
characteristics are approximations or averages set forth as
accurately as practicable. The phenotype of the variety may differ
from the descriptions set forth herein with variations in
environmental, climatic and cultural conditions.
`DTN03` is an evergreen perennial Dianella revoluta. `DTN03` is a
compact, erect plant with short internodes and an absence of aerial
stems, very short plant height and narrow leaf blades with a
bluish-green leaf color and strong leaf glaucosity. These
characteristics are unusual for Dianella revoluta, as these plants
are usually not very short and not as blue in color as `DTN03`. A
botanical description of `DTN03` and comparisons with other
varieties of Dianella revoluta are provided below.
Technical Description of the Variety
Plant characteristics: Growth habit erect, height very short (mean
16.4 cm), diameter 18-22 cm, very dense shoots with very short
internodes and an absence of aerial stems, typical and observed
number of plant shoots per cluster 10-15 with 5-7 leaves per shoot
extended in a 6 month old plant. Leaves: Attitude erect,
arrangement dichotomous, length medium (12-16 mm), width narrow
(mean 10.5 mm), upper side color yellow-green (RHS 147A), lower
side color yellow-green (RHS 147A), glaucosity strong, resulting in
blue-green overall appearance, texture of upper side and lower side
smooth, shape ligulate, apex acute, base of blade sheathed,
sheathes conduplicate, cross section concave, margin flat with
spines present with weak prominence. Basal sheath: Reddish
coloration that occurs in some other Dianella is absent in `DTN03`.
Basal shoots: Attitude erect, arrangement cluster. Flowers and
berries: `DTN03` has been observed for approximately four years and
has produced pale blue flowers on stems up to 50 cm high. Flower
type single. There may be 40 to 60 flowers per inflorescence on a
mature shoot (lateral stem is not adequate for this species).
Fragrance is absent. Peduncle diameter is 3-4 mm with medium
strength and an upright attitude typical of the species. Peduncle
color is yellow green (approximately RHS 146B-C). The flower buds
are 8-10 mm long and 3-4 mm wide. Bud color changes from yellow
green (RHS 147B) to violet blue (approximately RHS 89A) prior to
opening. Mature flowers have 6 petals with ovate shape. Petal color
(both upper and lower surfaces) is violet-blue (approximately RHS
94B-C). The three outer petals may have translucent tissue along
midrib section. Petal apex is acute with a fused section at the
midrib which may form a tuft. Petal attachment is sessile with an
obtuse to truncate base. Petal margin is entire. Petal length is
8-9 mm and petal width is 3-4 mm. Flowers develop in spring and
early summer and are followed by berries. Each inflorescence
typically yields approximately 6-8 berries. Berry diameter is 8-10
mm and berry shape is globose. Unripe berry color is yellow green
approx (RHS 146B) and ripe berry color is violet blue (RHS 89A).
Flowers are shown in FIG. 2. Reproductive organs: Mature flowers of
`DTN03` have 6 petals with ovate shape. Petal color is violet-blue
(approximately RHS 94B). Anther number is 6 and filament color is
yellow orange (approximately RHS 14A). Style is filiform and
simple. Ovary color is yellow green RHS 146B-C. Flower diameter
range is 9-13 mm. Petal attitude is strongly reflexed. Reproductive
organs are typical of the species. Cultural conditions: `DTN03` can
tolerate low nutrient conditions; it does not like continually wet
soil conditions, but can tolerate well-draining sandy soils to very
heavy clay soils. `DTN03` is fairly adaptable to a wide range of
soil pH. Cold and heat tolerance: `DTN03` has been observed to be
cold tolerant to -12.degree. C. in Clarendon, New South Wales,
Australia. Foliage color did not change under these conditions,
except for a slight burning at the very tips of the leaves. The
plant has also been grown for two years in Charleston, S.C., USA
and has remained evergreen down to -6.degree. C.
`DTN03` is also very heat tolerant. It adapted well to the high
heat conditions during summer in Clarendon, New South Wales,
Australia and high heat and humidity conditions during summer in
Charleston, S.C., USA without any noticeable disease or insect
damage. Drought tolerance: `DTN03` has very good drought tolerance.
`DTN03` survived three months without rainfall under hot conditions
in non-irrigated garden beds in summer in Clarendon. `DTN03` has
also been grown in non-irrigated beds in Charleston, S.C., USA for
two years, and has been observed to go as long as 45 days without
rainfall. Pest resistance: No known pests. May be susceptible to
root rot if in prolonged waterlogged soil conditions.
These and other features and characteristics of `DTN03` are
apparent from FIG. 1.
Comparisons with Other Dianella
`DTN03` is a more attractive ornamental grass-like plant as
compared with the parent `DR4000`. `DTN03` is characterized by a
bluish-green leaf color, stronger leaf glaucosity, shorter plant
height, and more compact plant habit with denser shoots as compared
with `DR4000`. The appearance of `DTN03` is bluish, whereas
`DR4000` is more yellow-green in color (see Table 1).
Dianella `DR5000` (U.S. Plant Pat. No. 17,719) is the most similar
comparator variety to `DTN03`. In comparison with `DR5000`,
cultivar `DTN03` has a shorter plant height with shorter internodes
and an absence of basal sheath anthocyanin coloration. (see Table
1).
A comparative trial of Dianella cultivar `DTN03` with `DR4000` and
`DR5000` was carried out in summer 2003 to autumn 2004 in
Clarendon, New South Wales, Australia. Plant observations and
descriptions were taken in autumn 2004. The data are presented in
Table 1 below. The plants for this trial were propagated from
divisions, planted into 130 mm pots filled with soilless potting
mix, and moved into 140 mm pots in full sun for nine months before
the trial started. Nutrition was maintained with slow release
fertilizers; pest and disease treatments were applied as needed.
The trial was designed such that twenty plants of each variety were
arranged in a completely randomized manner. Measurements were taken
from ten plants at random with one sample per plant.
TABLE-US-00001 TABLE 1 Dianella Variety Characteristic `DTN03`
`DR5000` `DR4000` Plant Height (cm) Mean 24.7 57.1 Std Deviation
16.4 1.9 4.9 LSD/Sig. 1.0 P .ltoreq. 0.01 P .ltoreq. 0.01 4.33
Density of Shoots Strong Strong Weak Leaf Width (mm) Mean 10.5 9.1
10.4 Std Deviation 0.9 1.0 1.0 LSD/Sig. 1.8 ns* ns* Leaf Glaucosity
Strong Strong Medium Leaf Color Upper Side 147A 147A 146A Lower
Side 147A 189A 146C-D Overall appearance Blue green Blue green
Yellow green Leaf cross section Concave Concave Flat-revolute Basal
Sheath Color Blue-green Reddish-Brown Red-Purple Berry color Green
Purple Purple *ns--not significant
* * * * *