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#racemose inflorescence

2 public questions tagged with this topic.

Plant Classification

Which is NOT a racemose inflorescence?

Racemose category encompasses simple raceme pedicellate flowers along elongated axis, spike sessile flowers directly on rachis, corymb with pedicels of different lengths bringing flowers to same level, umbel, spadix and capitulum as condensed racemose modifications. Cyme represents opposite cymose group where main axis terminates in flower, lateral branches sympodial. Therefore among raceme, spike, cyme, corymb, cyme is outlier belonging to determinate class. Morphologically racemose shows acropetal succession younger apex, cyme basipetal younger base, reflecting contrasting meristem fate dete

Ref: NCERT Class 11, Types racemose corymb spike; Judd Plant Systematics, racemose classification

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Plant Classification

Racemose inflorescence is characterized by

Racemose inflorescence is indeterminate where main axis peduncle or rachis grows indefinitely via continuous apical meristem activity, lateral flowers arise acropetally younger toward apex older toward base without terminating apex in flower. This unlimited growth contrasts with cymose where apex converts into flower ceasing extension. Basipetal succession and terminal flower define cymose. Racemose includes raceme, spike, catkin, corymb, umbel, spadix as variants of same monopodial principle. Mustard raceme exemplifies unlimited axis elongating even after first flowers open, enhancing flower

Ref: NCERT Class 11, Inflorescence racemose vs cymose acropetal; Simpson, Plant Systematics, inflorescence types

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