USA, California, Joshua Tree National Park, Joshua trees and rock outcrops in the Mojave Desert. USA, California, Joshua Tree National Park.

Green and orange moss on streamside rock, Major Creek. Columbia River Gorge National Scenic Area, Washington, USA.

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

Rose, single pink flower against granite, Inyo National Forest, California, USA.

Roses against stone wall with window, Castello di Amorosa, Napa Valley, California, USA.

Mojave Aster in Red Rock Canyon State Park, California, USA.

Peony, Rock's tree peony, Paeonia rockii, Close up of pale pink coloured flower showing stamen outdoor.

Peony, Rock's tree peony, Paeonia rockii, Close up of pale pink coloured flower showing stamen outdoor.

Morning Glory, Ground, Blue rock bindweed, Convolvulus sabatius, Close view of one mauve flower with a hoverfly collecting nectar.

Isotoma, Isotoma axillaris, One long tubular flower just opening to reveal dark stamen, Petals are white on the outside and violet blue on the front upperside.

Purple rock rose, Cistus purpureus, One flower, close side view showing the dark maroon and yellow splash on the pink crinkled petals and also the yellow stamen.

Mountain ash, Sorbus 'Joseph Rock', Clusters of the creamy yellow berries and autumn colour tinged leaves, in sunshine against a blue sky.