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FIG. 7. Floral ontogenetic stages in Scirpoides holoschoenus L. Abbreviations: a, stamen (primordium)/anther; ac, achene; f, filament; G, glume; g, gynoecium (primordium); o, ovule (primordium); ov, ovary (primordium); sg, stigma (primordium); st, style; *, rachilla apex. (A) Apical view of spikelet apex with five successive stages of floral development (numbered 1–5). In ‘1’, a rim-like glume primordium originates. In ‘2’, a flower primordium is being formed in the axil of a glume. In ‘3’ and ‘4’, the flower primordium is expanding laterally. In ‘5’, three stamen primordia are starting to develop. (B) Detail of an early developmental stage of a flower, abaxial view. Three stamen primordia have appeared, and on the top of the flower primordium, a disc-like gynoecium primordium is formed. (C) Abaxial view of a developing flower. The gynoecium primordium is differentiating into an annular ovary wall primordium, surrounding a central ovule primordium. (D) Abaxial view of a developing flower. Stigma primordia opposite the three stamens become apparent. (E) Lateral–abaxial view of a developing flower. One lateral stamen has been removed. The ovary wall grows up from its base. The stamens start differentiating into filament and anthers. Notice the delay in development of the abaxial stamen. (F and G) Abaxial (F) and adaxial (G) view of a nearly mature flower. Note the connective crests on the top of each anther. (H) Mature flower, seen from the adaxial side. (I) Achene with persistent filaments and stigmas.
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