Figure 1.
Morphological features of Rubiaceae. Typical morphological Rubiaceae features, as shown with an example of the most famous family member, namely Coffea arabica L., which include (A) underside of leaf with domatia, (B) opposite leaf pair with axillary placed flowers, (C) dissected flower showing inside of corolla tube, anthers and style, (D) tip of stem showing stipules with secretion, (E) longitudinal section of ovary, (F) floral bud, and (G) bracts (Reproduced with permission from the National Botanical Garden Belgium; Artist: O. van de Kerckhove, 1995).