Jouan & Rius / Aboriginal rock painting, Art Gallery Cave, Carnarvon National Park, Queensland, Australia. The painting is believed to me more than 2000 years old and shows hands, boomerangs, emu feet and rock walla...

Nigel Cattlin / Orange balsam (Impatiens capensis). Kennet and Avon Canal, Berkshire, England, UK. August.

Nigel Cattlin / Orange balsam (Impatiens capensis) flowering and seeding at edge of Kennet and Avon Canal, Berkshire, England, UK. August.

Nigel Cattlin / Water forget-me-not (Myosotis scorpioides). Berkshire, England, UK. June.

Nigel Cattlin / Water forget-me-not (Myosotis scorpioides). Berkshire, England, UK. June.

Ernie Janes / Daisies (Bellis perennis) and Forget-me-not (Myosotis arvensis) in garden, Norfolk, England, UK, May.

Nigel Cattlin / Sensitivity plant (Mimosa pudica) shown before and after touching the sensitive leaves.

Ernie Janes / Daisies (Bellis perennis) and Forget-me-not (Myosotis arvensis) in garden, Norfolk, England, UK, May.

Heather Angel / Grand balsam (Impatiens grandis) with long spur. Pollinated by butterflies, native to India and Sri Lanka. Focus stacked, cultivated plant.

Heather Angel / Himalayan balsam (Impatiens glandulifera), dissection of flowers. Male phase above, downward projecting stamens release pollen onto backs of bumblebees and honey bees. Female phase below with downward...

Heather Angel / Balsam (Impatiens rosulata) with yellow nectar guides. Endemic to Kitulo Plateau, Tanzania.

Heather Angel / Balsam (Impatiens bicaudata) flowers with lines leading to nectaries. Cultivated. Native to Madagascar.