Glandular Hairs of Sigesbeckia jorullensis Kunth (Asteraceae): Morphology, Histochemistry and Composition of Essential Oil

Glandular hairs of Sigesbeckia jorullensis, important for epizoic fruit propagation, were studied by Heinrich et al. (pp. 459-458). Apical layers of glandular heads are characterized by leucoplasts, sub-apical layers by chloroplasts. The hairs produce a sticky essential oil that is characterized by a high content of oxygenated terpenes and is probably synthesized in leucoplasts.