FIGURE 1 in Avicennia (Acanthaceae: Avicennioideae) in North America and Mesoamerica

FIGURE 1 (left). Pollen of Avicennia spp. A–C. Avicennia bicolor (Sediles 461). A. Interapertural view. B. Apertural view. C. Polar view. D–G. Avicennia germinans (D, Palmer 484; E–G, Salywon 1188). D. Interapertural view. E. Apertural view. F. Polar view. G. Interapertural view. H–K. Avicennia marina subsp. australasica (Moran 28024). H. Interapertural view. I. Apertural view. J. Polar view. K. Apertural view. Scales = 5 µm. Pollen measurements (n = number of grains measured, P = polar diameter, and E = equatorial diameter). Many additional grains from each specimen were examined, but data summarized below were made on a subset of those oriented to permit accurate measurements and photographic documentation. Avicennia bicolor — Sediles 461 (CAS, n = 5): P = 19–22 μm, E = 19–24 μm, P:E = 0.86–0.92. Avicennia germinans — Daniel & Araque 9478 (CAS, n = 2): P = 23 μm, E = 24–25 μm, P:E = 0.92; de Nevers et al. 6554 (CAS, n = 2): P = 25 μm, E = 26–28 μm, P:E = 0.89; Palmer 484 (CAS, n = 1): P = 46 μm, E = 24 μm, P:E = 1.90; Salywon 1188 (CAS, n =4): P = 27–42 μm, E = 24–29 μm, P:E = 0.93–1.75. Avicennia marina subsp. australasica — Moran 28024 (CAS, n = 4): P = 28–41 μm, E = 24–27 μm, P:E = 1.04–1.70.