Fig. 1. Features of wild-type and knuckles gynoecia and siliques from plants grown at 25°C. (A) Inflorescences. (B) Drawing depicting wild-type anthesis-stage gynoecium, lateral and medial views, and cross-sectional view through single locule of the ovary. Inset: comparison of wild-type and knu gynoecia at anthesis. (C) Wild-type (left) and knu siliques (right) with examples of protruding ectopic structures (far right). (D) Longitudinal section through immature knu silique showing ectopic stamen and gynoecium. (E) Partially dissected dehiscent knu siliques showing a pellet-like knuckle at left with a teased out structure at right where a secondary ectopic gynoecium is emerging from the first. The arrowhead indicates stem-like umbilicus that attaches knuckle to the replum and pedicel. (F) Replum of dehiscent knu silique with knuckle dissected to show desiccated ovules of primary iteration and ectopic stamens of the secondary iteration. (G) Cross-section through tricarpelloid knuckles silique showing knuckle with arrows indicating at least three iterations of carpel tissue. Scale bars: 10 mm in A; 1 mm in B,G; 5 mm in C,F; 100 µm in D; 200 µm in E. ab, abaxial; ad, adaxial; eg, ectopic gynoecium; eo, ectopic ovule; ep, ectopic primordia/um; es, ectopic stamen; g, gynophore; lat, lateral; med, medial; ov, ovule; pd, pedicel; p, placenta; re, reiteration; r, replum; sp, septum; s, style; tt, transmitting tract; v, valve; wt, wild-type.