FIGURE 2. Stem and leaf lamina anatomy. A in The rediscovery of Billburttia vaginoides, with notes on the morphology, anatomy, traditional uses and conservation status of the genus Billburttia (Apieae, Apiaceae)

FIGURE 2. Stem and leaf lamina anatomy. A. Billburttia capensoides (Rakotonandrasana & Ratrimosaona 1494, TAN, CNARP). B. B. vaginoides (Rakotonandrasana & Ratrimosaona 1495, TAN, CNARP). A1 and B1. Transverse sections of stems; pf—protophloem fibers. A2 and B2. Transverse sections of leaf lamina; sc—small secretory canals associated with adaxial extensions of sheaths around vascular bundles. A3 and B3. Surface view of abaxial epidermis of leaf lamina. Black arrowheads mark the aggregates of acicular crystals. Scale bars: A1 = 500 μm; A2, B1, B2 = 200 μm; A3, B3 = 100 μm.