Bossiaea rhombifolia, is a species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 of flowering plant

Flowering plant

The flowering plants , also known as Angiospermae or Magnoliophyta, are the most diverse group of land plants. Angiosperms are seed-producing plants like the gymnosperms and can be distinguished from the gymnosperms by a series of synapomorphies...

 in the pea family

Fabaceae

The Fabaceae or Leguminosae, commonly known as the legume, pea, or bean family, is a large and economically important family of flowering plants. The group is the third largest land plant family, behind only the Orchidaceae and Asteraceae, with 730 genera and over 19,400 species...

 found in eastern Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

. An upright shrub to two metres tall. Branches are hairless and mostly flat, particularly when young. A most attractive plant when in full flower.

Leaves are angular ovate or rhomboid in shape, 3 to 10 mm long. Leaf stipule

Stipule

In botany, stipule is a term coined by Linnaeus which refers to outgrowths borne on either side of the base of a leafstalk...

s are triangular, 1 mm long.

Flowers are the typical yellow and red of this “bacon and egg” wildflower group, usually flowering between July and October.

It occurs from Wadbilliga National Park

Wadbilliga National Park

Wadbilliga National Park is in south-eastern New South Wales Australia, 425 km southwest of Sydney via Cobargo, and 150 km south east of Canberra. The nearest towns are Narooma and Cobargo in the east, and Cooma on the plateau in the west....

 in southern New South Wales

New South Wales

New South Wales is a state of :Australia, located in the east of the country. It is bordered by Queensland, Victoria and South Australia to the north, south and west respectively. To the east, the state is bordered by the Tasman Sea, which forms part of the Pacific Ocean. New South Wales...

 up north to Queensland

Queensland

Queensland is a state of Australia, occupying the north-eastern section of the mainland continent. It is bordered by the Northern Territory, South Australia and New South Wales to the west, south-west and south respectively. To the east, Queensland is bordered by the Coral Sea and Pacific Ocean...

. The habitat is chiefly the drier eucalyptus

Eucalyptus

Eucalyptus is a diverse genus of flowering trees in the myrtle family, Myrtaceae. Members of the genus dominate the tree flora of Australia...

 forest.

The specific epithet rhombifolia refers to the diamond shaped leaves in some specimens.

Two forms are recognised:

• Bossiaea rhombifolia subsp. concolor found in inland areas such as the Pilliga Scrub
  Pilliga forest
  The State Forests of The Pilliga, commonly known as the Pilliga Scrub , constitute some 3000 km2 of semi-arid woodland in temperate north-central New South Wales, Australia...
  
  
• Bossiaea rhombifolia subsp. rhombifolia more usually found on the coast and ranges.

This plant first appeared in scientific literature in 1825, in the Prodromus Systematis Naturalis Regni Vegetabilis

Prodromus Systematis Naturalis Regni Vegetabilis

Prodromus Systematis Naturalis Regni Vegetabilis, also known by its standard botanical abbreviation Prodr. , is a 17-volume treatise on botany initiated by A. P. de Candolle. De Candolle intended it as a summary of all known seed plants, encompassing taxonomy, ecology, evolution and biogeography....

, authored by the Swiss botanist, Augustin Pyramus de Candolle.