Plant Family: Stegnospermataceae – Genus Stegnosperma

Plant Family: 3 Genera in Staphyleaceae

Plant Family: 60 Genera in Scrophulariaceae – Figwort Family

Plant Family: 102 Genera in Solanaceae

Plant Family: Simmondsiaceae – Simmondsia Chinensis in Genus Simmondsia – Jojoba

Plant Family: 20 Genera in Simaroubaceae

Plant Family: Smilacaceae – 264 Species in Genus Smilax – Greenbrier

Plant Family: 2 Genera in Sphaerosepalaceae

Plant Family: Setchellanthaceae – Setchellanthus Caeruleus in Genus Setchellanthus

Plant Family: 2 Genera in Sladeniaceae

Plant Family: Scheuchzeriaceae – Scheuchzeria Palustris in Genus Scheuchzeria

Plant Family: 2 Genera in Siparunaceae

Plant Family: Sciadopityaceae – Sciadopitys Verticillata in Genus Sciadopitys

Plant Family: 3 Genera in Schoepfiaceae

Plant Family: 4 Genera in Schlegeliaceae

Plant Family: 3 Genera in Schisandraceae

Plant Family: Sarcobataceae – Genus Sarcobatus

Plant Family: 143 Genera in Sapindaceae – Soapberry Family

Plant Family: 3 Genera in Salvadoraceae

Plant Family: 40 Genera in Santalaceae – Sandalwood Family

Plant Family: 3 Genera in Sarraceniaceae

Plant Family: 616 Genera in Rubiaceae – Coffee Family

Plant Family: 39 Genera in Saxifragaceae

Plant Family: 4 Genera in Saururaceae – Lizard’s Tail Family