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Fig. 7 | EvoDevo

Fig. 7

From: Flower-like meristem conditions and spatial constraints shape architecture of floral pseudanthia in Apioideae

Fig. 7

Scandix pecten-veneris. Morphogenesis of the umbel (A–E, I) and ray flowers (F–H). A Naked FUM. B FUM fractionates few umbellet meristems in a slow, successive manner. C Umbellets begin to elongate stalks (raylets) which results in their physical separation. The first initiated umbellet begins to fractionate common ray flower/involucel primordia in a spiral sequence. D The initiation of floral organs begins with stamen primordia. Prominent, bifid involucellar bracts become apparent. E Umbellet with mature ray flower buds and three radial flowers. F First floral organs (stamens) are initiated from spherical ray flower meristem in a spiral sequence. G Ray flower meristem before gynoecium initiation. Note the absence of sepals. H Late-stage ray flower during formation of gynoecium. The enlarged petal lobes have not yet developed. I Bud of a umbel. Note the enormous size discrepancy between the first and the third initiated umbellets (second one removed). For colours and abbreviations, see Fig. 2. Scale bars = 100 µm

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