Figure 1.

Ontogeny of Gifu flower. a, Gifu flower; bar = 1 mm. b, Dissection of Gifu flower; bar = 1 mm. c to k, SEM showing the floral ontogeny of wild-type L. japonicus. Sp, Sepal; Pt, petal; Sti, inner stamen; Sto, outer stamen; Ca, carpel. Bar = 50 μm. The adaxial side of all floral primordia faces up in all micrographs. c, Stage 0, Floral primordia (crosses) are initiated from the I2. d, Stage 1, A bract (arrowhead) develops from floral primordia opposite the adaxial position (cross). e, Stage 2, A sepal primordium (arrowhead) is initiated at the abaxial position of the floral meristem. f, Stage 3, One anlage (common primordium, arrowhead) forms in the axil of the abaxial sepal. The other four sepal primordia (arrow) appear at the lateral and adaxial positions of the floral meristem. g, Stage 4, A carpel primordium (arrowhead) appears in the center of the floral meristem. Two anlagen (black arrowhead) are initiated in the axils of the lateral sepals. Two abaxial petal primordia (keel, arrow) and one abaxial outer stamen primordium (cross) form from the flattened anlage. h, Stage 5, Two lateral petal primordia (wing, arrow) and two outer stamen primordia (arrowhead) form from the two lateral anlagen. i, Stage 6, One adaxial petal primordium (the standard, arrowed) and two outer stamen primordia (arrowhead) are initiated. j, Stage 7, The five inner stamen primordia are initiated. k, After Stage 7 organ primordia begin elongating.