Please note that some plant varieties referred to in links might not be available in Australia, or may be known here under a different name.
Argyranthemum (Marguerite Daisy)
Traditionally called marguerite daisy. Sometimes called Federation Daisies®, but this is a trade name that only applies to a particular brand Australian-bred varieties (see www.federationdaisies.co.nz/about.htm for more information). Older types are large and lanky, but newer types are usually bred for compact growth as well as a variety of flower colours and forms. Short lived plants but in so pretty in flower you might think they came straight from a child's picture-book.
Another daisy-flowered genus, usually in yellow/orange tones. Common Coreopsis lanceolata is considered a weed in many areas but there are other select species/hybrids available.
Secrets of the black dahlia
A study of the "black" dahlia has revealed that the large amounts of red anthocyanins are produced due to a lack of flavones (associated with white flowers) competing for biochemical building blocks. It is not caused by increased activity of the anthocyanin pathway. The findings are a step towards engineering flavone content of plants. Source: Le Rouge et le Noir: Where the black dahlia gets its color (November 2012)
Euryops chrysanthemoides formerly Gamolepis chrysanthemoides.
Gazania Gazania frebsiana
. Kruger National Park - South Africa Safari and Lodging Guide
A daisy-style flower and moderately tolerant of dry conditions. Old types are rather straggly and require sun for the flowers to open, but new selections have a more compact habit and some will stay open all the time. Look out for Tradewinds series, Serenity series and 'Voltage Yellow'. A good video introduction to the group at https://www.youtube.com/watch?v=7726Cw5xIGE
Describes the origin of this variety. City of Santa Rosa, California
Washington State University Clark County Extension
The secret of van Gogh's sunflowers
The sunflowers painted by van Gogh have a proliferation of yellow petals and a reduced central disc compared to common sunflowers which typically have a only single whorl of yellow "ray florets". A mutant gene creating a double-flowered inflorescence has been identified. A double varieties screened have the same mutation, suggesting this is the indeed the one responsible for the blooms van Gogh painted. Similar varieties are popular today as ornamentals and cut flowers. Source: UGA scientists reveal genetic mutation depicted in van Gogh's sunflower paintings (March 2012)
Goondiwindi students sunflower champions
Goondiwindi State High School have won the annual Sunflower Competition withan entry weighing 1.837kg. More information atThe University of Queensland website: Goondiwindi growers top the scales (May 2010)