Thesium nautimontanum from the type herbarium specimen. For dimensions, see Figure 2. A spicate inflorescence subtended by bracts B close-up of inflorescence bracts C flower, lateral view, showing triangular external glands in corolla lobe sinuses D flower longitudinal section E ovary longitudinal section showing twisted placental column and ovules (one ovule removed to visualise the placentation) F close-up view of interior surface of corolla lobes showing unusual fleshy tissue on inner surface of corolla lobes G young fruit showing persistent corolla and reticulate outer wall of ovary.