Daviesia Dilatata
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''Daviesia dilatata'' is a species of flowering plant in the family
Fabaceae Fabaceae () or Leguminosae,International Code of Nomen ...
and is
endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...
to the south-west of Western Australia. It is an erect, open,
glabrous Glabrousness () is the technical term for a lack of hair, down, setae, trichomes, or other such covering. A glabrous surface may be a natural characteristic of all or part of a plant or animal, or be due to loss because of a physical condition, ...
shrub with scattered, often sickle-shaped
phyllode Phyllodes are modified petiole (botany), petioles or leaf stems, which are leaf-like in appearance and function. In some plants, these become flattened and widened, while the leaf itself becomes reduced or vanishes altogether. Thus the phyllode co ...
s, and orange, red, yellow and dark crimson flowers.


Description

''Daviesia dilatata'' is an erect, open, glabrous, shrub with greyish to
glaucous ''Glaucous'' (, ) is used to describe the pale grey or bluish-green appearance of the surfaces of some plants, as well as in the names of birds, such as the glaucous gull (''Larus hyperboreus''), glaucous-winged gull (''Larus glaucescens''), ...
foliage, and that typically grows to a height of up to . Its leaves are reduced to scattered, erect but down-curved, often sickle-shaped phyllodes long and wide with a sharply pointed black tip. The flowers are arranged in clusters of three to eight on a peduncle up to long, the
rachis In biology, a rachis (from the [], "backbone, spine") is a main axis or "shaft". In zoology and microbiology In vertebrates, ''rachis'' can refer to the series of articulated vertebrae, which encase the spinal cord. In this case the ''rachi ...
long, each flower on a thread-like
pedicel Pedicle or pedicel may refer to: Human anatomy *Pedicle of vertebral arch, the segment between the transverse process and the vertebral body, and is often used as a radiographic marker and entry point in vertebroplasty and kyphoplasty procedures ...
long with spatula-shaped
bract In botany, a bract is a modified or specialized leaf, associated with a reproductive structure such as a flower, inflorescence axis or cone scale. Bracts are usually different from foliage leaves in size, color, shape or texture. They also lo ...
s about long at the base. The
sepal A sepal () is a part of the flower of angiosperms (flowering plants). Usually green, sepals typically function as protection for the flower in bud, and often as support for the petals when in bloom., p. 106 Etymology The term ''sepalum'' ...
s are long and joined at the base, the two upper lobes joined for most of their length and the lower three triangular. The
standard Standard may refer to: Symbols * Colours, standards and guidons, kinds of military signs * Standard (emblem), a type of a large symbol or emblem used for identification Norms, conventions or requirements * Standard (metrology), an object ...
is elliptic with a central notch, long, wide and orange with a red base and a yellow centre, the
wings A wing is a type of fin that produces both lift and drag while moving through air. Wings are defined by two shape characteristics, an airfoil section and a planform. Wing efficiency is expressed as lift-to-drag ratio, which compares the bene ...
long and dark crimson, and the
keel The keel is the bottom-most longitudinal structural element of a watercraft, important for stability. On some sailboats, it may have a fluid dynamics, hydrodynamic and counterbalancing purpose as well. The keel laying, laying of the keel is often ...
long and dark crimson. Flowering occurs in August and September and the fruit is a flattened, triangular pod long.


Taxonomy and naming

''Daviesia dilatata'' was first formally described in 1995 by
Michael Crisp Michael Douglas Crisp (born 1950) is an emeritus professor in the Research School of Biology at the Australian National University located in Canberra. In 1976, he gained a PhD from the University of Adelaide, studying long-term vegetation chan ...
in the journal ''
Australian Systematic Botany ''Australian Systematic Botany'' is an international peer-reviewed scientific journal published by CSIRO Publishing. It is devoted to publishing original research, and sometimes review articles, on topics related to systematic botany, such as b ...
'' from specimens collected near Ravensthorpe in 1979. The
specific epithet In Taxonomy (biology), taxonomy, binomial nomenclature ("two-term naming system"), also called binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, both of which use Latin gramm ...
(''dilatata'') means "enlarged", referring to the phyllodes that widen upwards.


Distribution and habitat

This species of pea grows in heath and tall shrubland between Nyabing,
Bremer Bay Bremer may refer to: People *Bremer (surname) *Bremer Ehrler (1914–2013), American politician * Bremer (born 1997), Brazilian footballer Places ;Australia *Bremer Bay, Western Australia *Bremer Marine Park * Bremer Island *Bremer River (disambig ...
and
Cape Arid National Park Cape Arid National Park is a List of national parks of Australia, national park located in Western Australia, southeast of Perth. The park is situated east of Esperance, Western Australia, Esperance and lies on the shore of the South coast of ...
in the
Esperance Plains Esperance Plains, also known as Eyre Botanical District, is a biogeography, biogeographic region in southern Western Australia on the South_coast_of_Western_Australia , south coast between the Avon Wheatbelt and Hampton bioregions, and bordere ...
,
Jarrah Forest Jarrah Forest, also known as the Southwest Australia woodlands, is an interim Australian bioregion and ecoregion located in the south west of Western Australia.
and Mallee biogeographic regions of south-western Western Australia.


Conservation status

''Daviesia dilatata'' is classified as "not threatened" by the Western Australian Government
Department of Biodiversity, Conservation and Attractions The Department of Biodiversity, Conservation and Attractions (DBCA) is the Government of Western Australia, Western Australian government department responsible for managing lands and waters described in the ''Conservation and Land Management A ...
.


References

{{Taxonbar, from=Q51043698 dilatata Eudicots of Western Australia Plants described in 1995 Taxa named by Michael Crisp