Fig. 9From: Evolution of flower allometry and pigmentation in Mammillaria haageana (Cactaceae)Cross-section of in Mammillaria haageana subsp. san-angelensis along different longitudinal regions. a-b distal section, c-d middle section, and e-f proximal section. A modeled tepal is shown on the left-hand side for reference. abE abaxial epidermis, adE adaxial epidermis, mb mucilage body, light asterisk indicates vascular bundles, and black arrows represent mesophyll cellsBack to article page