Opuntia macrorhiza (Charles B.) has rich, tangerine orange flowers.

This red/black spines selection of Opuntia is a beautiful form with red & black spines on 3" long pads.

Opuntia polyacantha 'Citrus Punch' has orange & yellow spines & stunning flowers in apricot orange, copper & plum red.

Ornithogalum dubium is unusual in its genus for having bright tangerine orange flowers rather than white and green centres.

Osmanthus fragrans f. aurantiacus has small, orange, extremely fragrant, edible flowers famous in China for use in teas and other foods.

Osmunda cinnamomea, the cinnamon fern, has lush green vegetative fronds and cool rusty orange sporophytic fronds.