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Roughly 2% of all hydrocarbons fixed in photosynthesis are converted into flavonoids and their derivatives, such as the anthocyanins. Not all land plants contain anthocyanin; in the Caryophyllales (including cactus, beets, and amaranth), they are replaced by betalains. Anthocyanins and betalains have never been found in the same plant. [10] [11]
The flower has a bright blue corolla up to 4 centimeters long which can be bell-shaped, funnel-shaped, or round and flattened. It can have white spots in the throat. The protruding stamens and style can be 4.5 centimeters long. The fruit is a capsule up to 1.5 centimeters long. [9] It grows in dry, sandy places below 4,000 feet (1,200 m). [7]
Protocyanin is a blue pigment of cornflower (Centaurea cyanus). It is composed from succinylcyanin (anthocyanin), malonylflavone (co-pigment), iron and magnesium anions, and two calcium ions to stabilize the complex. Interesting is that the same anthocyanin when is not in complex with the metal ions is present in red rose petals. [8]
The flowers are most commonly an intense blue colour and arranged in flowerheads (capitula) of 1.5–3 cm diameter, with a ring of a few large, spreading ray florets surrounding a central cluster of disc florets. The blue pigment is protocyanin, which in roses is red. [5] Fruits are approx. 3.5 mm long with 2–3 mm-long pappus bristles. [6]
Blue color inflorescences of Hydrangea macrophylla. A metalloanthocyanin is a chemical complex giving color to petals of certain plants.. These complexes are self-assembled, supramolecular metal complex pigment composed of stoichiometric amounts of anthocyanins, flavones, and metal ions.
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It is an herbaceous annual or perennial twining liana growing to 2–4 m (7–13 ft) tall. The leaves are spirally arranged, 3–7 cm (1–3 in) long with a 1.5–6 cm (1 ⁄ 2 – 2 + 1 ⁄ 2 in) long petiole.
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