Seeds and seed coat morphology in species of the Purple corolla and Pubescens Clades A–D C. cardenasii E–H C. eshbaughii I–L C. eximium M–P C. pubescens A, M untreated seeds (in A hilum terminal, M hilum medial) B treated seed C, G, K, O testa pattern of treated seeds showing anticlinal cell walls with fringe (C) and fibrils (G) D, H, L, M detail of testa cells E, I, N seeds with testa partly digested (in I hilum subterminal) F, J detail of a non-digested portion of the seed coat. Scale bars: 200 μm (A, B, E, I, M, N); 20 μm (C, D, G, H, J, K, L, P); 50 μm (F, O).