Stephania venosa (syn. S. rotundifolia) is a caudiciform houseplant producing vines of heart-shaped leaves.

Stephania venosa (syn. S. rotundifolia) is a caudiciform houseplant producing vines of heart-shaped leaves.

Stephania venosa (syn. S. rotundifolia) is a caudiciform houseplant producing vines of heart-shaped leaves.

Strelitzia reginae, the bird-of-paradise, is one of the most famous and distinctive of the tropical flowers resembling an orange and blue crane.

Strelitzia reginae, the bird-of-paradise, is one of the most famous and distinctive of the tropical flowers resembling an orange and blue crane.

'Mandela's Gold' (formerly 'Kirstenbosch Gold') is a special form of Strelitzia reginae with yellow flowers.

Streptocarpus 'Spin Art' is a Cape primrose and relative of the African violet with cool tri-coloured flowers of purple, red and yellow.

Stylophorum diphyllum or celandine poppy is a rare, bright yellow poppy relative for the woodland garden.

Stylophorum lasiocarpum has bright yellow poppy-like flowers atop mounds of very cool dissected foliage.

Succisa pratensis, known as blue buttons or devil's-bit scabious, is a perennial wildflower with globular, purple pincushions.

Syneilesis aconitifolia is a cool foliage plant that looks like a shredded umbrella!

Syneilesis palmata is a rarer species of umbrella plant than the related S. aconitifolia with broader, lighter green foliage that is more lush appearance.

You'll never forget the first time you see a bat flower in full bloom! Tacca chantrieri is super botanically intriguing.

You'll never forget the first time you see a black bat flower in full bloom! Tacca chantrieri 'Black' is super botanically intriguing.

Tacca chantrieri 'Green Isle' has incredible bat-like flowers with long whiskers. A super botanically intriguing oddball.

You'll never forget the first time you see a white bat flower in full bloom! Tacca chantrieri 'Nivea' is super botanically intriguing.

Incredible bat-like flowers with long whiskers. Tacca integrifolia is a super botanically intriguing oddball.

Tecophilaea cyanocrocus has exquisite gentian blue flowers with white stripes. Amazing.

Tecophilaea cyanocrocus 'Leichtlinii' is a rare form of the Chilean blue crocus with white flowers tipped with rich, sky blue.

Tecophilaea cyanocrocus 'Storm Cloud' is a rare form of the Chilean blue crocus with white flowers tipped with lavender and bluish lavender in early spring.

Tecophilaea cyanocrocus 'Violacea' has velvety purple-blue flowers in early spring with thin white stripes.

Teucrium scorodonia 'Crispum', the curly wood sage, offers wonderful textural foliage with crinkled and rippled edges.

Thalictrum 'Elin' is a gargantuan meadow rue reaching heights of of 8-12 feet with burgundy stems, blue-green foliage and tiny lavender flowers with yellow stamens.

Tigridia pavonia 'Alba Grandiflora' is an Iris relative with large, three-petaled white flowers with red central spots.