Lone tree in autumnal colour in vast pasture, Montana, USA.

Big Leaf Maple trees in autumnal colours with sunburst, Monroe, Oregon, USA.

Bougainvillea, Mass of colourful flowers growing along rock wall, Hawaii Island, USA.

Protea, Peach coloured flowers growing outdoor, Big Sur coast, California, USA.

Heliconia longissima 'Red Wings', Colourful plant growing outdoor, The Big Island, Hawaii, USA.

Beehive Ginger, Zingiber spectabile, Hawaii Tropical Botanical Gardens, Hawaii, USA.

Heliconia flowers, Hawaii Tropical Botanical Gardens, USA.

Close up of Traveller's Palm. Hawaii, The Big Island.

Calla Lilies at sunset, California, USA.

Rhododendron, McCabe Rhododendron, Rhododendron macabeanum, Close side view of one flowerhead with several white trumpet shape flowers with deep red throats, atop a cluster of long leaves.

Cow's horn, Euphorbia grandicornis, Close up showing the spines and small yellow flowers.

Echinacea, Tennessee Purple coneflower, Echinacea tennesseensis, Side view of several stems in various stages of flower with purple lavender.