These plants are varieties of Sansevieria, commonly known as Snake Plants (or "Mother in Law's Tongue"). Specifically, these look like "Hahnii" or Bird's Nest varieties, which stay compact and rosette shaped. "Breathing a little easier Der Duft der Rosen (Rhodopark): Erlebnisraum Natur Rhododendron (Forrestii Gruppe) 'Baden Baden', Rhododendron Olivenbaum dngen Mein schner Garten Rhododendron micranthum 'Bloombux', Rhododendron 'Bloombux' Baumschule Schumann