Fig. 6 Pinguicula alpina, late flower development. a Stage with ring-shaped gynoecium primordium. b-e Flowers with calyx aestivation visible. f in Inflorescence morphology and flower development in Pinguicula alpina and P. vulgaris (Lentibulariaceae: Lamiales): monosymmetric flowers are always lateral and occurrence of early sympetaly

Fig. 6 Pinguicula alpina, late flower development. a Stage with ring-shaped gynoecium primordium. b-e Flowers with calyx aestivation visible. f Flower with lower lip sepals removed to show young spur of corolla. Abbreviations: g, gynoecium; pl, lower lip petals; pu, upper lip petals; s, spur, sl, lower lip sepals; su, upper lip sepals; st, stamen. Scale bars 0100 μm (a), 200 μm (b), 300 μm (e), 500 μm (c, d), 1,000 μm (f)