Lodicules of the cleistogamous barley cultivar SV235 (cly1.b2) and in its F1 hybrids with cvs. KNG (cly1.b) and SV230 (cly1.c). (A–C) Left, KNG; middle, SV235 × KNG F1 hybrid; right, SV235. (D–F) Left, SV230; middle, SV235 × SV230 F1; right, SV235. (A and D) Transverse sections at the green anther stage. (B, C, E, and F) Stereomicroscope images. (B and E) Yellow anther stage, (C and F) Anthesis stage (spikes exposed to 100 ppm 2,4-d for 3 days). Scale bars: (A and D) 200 μm; (B, C, E, and F) 600 μm. Lodicule (lo), stamen (st), ovary (ov), lemma (le), and palea (pa).